# PV Ribbon Materials: Copper Core, Hardness and Coating

> A PV ribbon is a copper conductor with a solder coating. What copper grade, yield strength, coating alloy and coating thickness each protect against.

![PV Ribbon Materials: Copper Core, Hardness and Coating](https://cdn.ooitech.com/static/upload/image/20261016/2026101601010101.webp)

- ** Ooitech Editorial Team
- ** 2026-10-18
- ** 30 Views
- ** [Blog](./Blog.html)

## PV Ribbon Materials: Copper Core, Hardness and Coating

**Quick answer:** A PV ribbon is a copper conductor with a solder coating, and the two parts do different jobs. The copper carries the current and decides how much stress the ribbon passes on to the cell when a joint cools — which is a question of yield strength rather than conductivity. The coating is the solder: it sets the soldering temperature, wets the silver gridlines and determines how long the joint lasts. Four figures on a datasheet control those two jobs: copper grade, yield strength, coating alloy and coating thickness.

Two ribbons can share a diameter, a coating weight and a spool. Run them through the same stringer and one produces joints that survive thermal cycling while the other produces a scatter of low pull strengths and a rising microcrack count. When the geometry is identical, what is left is the material.

This article opens the ribbon up: what the copper substrate contributes, what the coating contributes, and which parameter on a supplier datasheet is protecting against which failure.

## Why Copper, and Why Hardness Matters More Than Conductivity

The requirements on a ribbon pull against each other. It has to carry the cell's current with minimal loss, take solder reliably, stay soft enough not to load the cell, and be cheap enough to disappear into the module's bill of materials. Put the candidate metals side by side and the reasoning becomes short.

| Material | Resistivity (µΩ·cm) | Density (g/cm³) | Expansion (10⁻⁶/K) | Main problem |
| --- | --- | --- | --- | --- |
| Silver (Ag) | about 1.59 | 10.5 | about 19 | Cost |
| Copper (Cu) | about 1.72 | 8.96 | about 17 | Heavier; price volatility |
| Aluminium (Al) | about 2.82 | 2.70 | about 23 | Hard to solder; expands more |
| Silicon (Si), reference | — | 2.33 | about 2.6 | The material the ribbon must not damage |

Silver conducts better than anything else in the table and costs something like a hundred times more than copper, which rules it out for a part measured in tenths of a gram per cell. Aluminium is cheap and light, but its resistivity is about 60% higher, its surface oxide makes conventional soldering close to impossible, and it expands more. Copper is the balance point of the four requirements, and its statistics are ordinary: heavier than aluminium, less conductive than silver, volatile in price.

The one hard flaw is the mismatch with silicon. Copper expands at roughly 17 × 10⁻⁶/K against about 2.6 for silicon, more than six times as much. Picture what that means across a whole cell. The ribbon is soldered at a temperature well above 150 °C and then cools to room temperature. Over that range the copper wants to contract by about 0.2%; the silicon beneath it wants to contract by about 0.03%. Something has to give, and the cell is the more fragile of the two.

This is why the specification that matters most on a copper substrate is not its conductivity. It is how soft the copper is when it reaches the stringer.

## Copper Substrate: Grade, Purity and Resistivity

Ribbon copper is normally oxygen-free copper. In the Chinese grade system that means TU1 or TU2, with minimum copper contents of 99.97% and 99.95%; the oxygen-containing alternative is T2. The same families appear elsewhere as C10100, C10200 and C11000.

| Grade | Copper content, minimum | Rough international equivalent | Note |
| --- | --- | --- | --- |
| TU1 | 99.97% | C10100 (OFE) | Oxygen-free |
| TU2 | 99.95% | C10200 (OF) | Oxygen-free |
| T2 | 99.90% | C11000 (ETP) | Oxygen-containing |

Two practical reasons sit behind the oxygen-free preference. The first is conductivity: fewer impurities and less oxygen keep resistivity closer to the theoretical value of pure copper. The second is annealing behaviour. In copper that contains oxygen, hydrogen from a reducing furnace atmosphere can react with copper oxide at the grain boundaries, a problem known in the trade as hydrogen embrittlement or hydrogen disease. Oxygen-free copper avoids it, grains grow more uniformly, and the softening that comes out of the furnace is more consistent from coil to coil.

The second reason is the one with commercial weight, because it decides how repeatable the next process step is. Purity, in this context, is not a marketing line. It is the difference between two coils of nominally identical ribbon arriving at the stringer with the same hardness or with different hardness.

## Hardness: Work Hardening, Annealing and the Yield-Strength Window

Hardness starts as a side effect of manufacturing. Drawing and rolling deform the copper: grains elongate in the direction of working, dislocations pile up, tensile strength rises and elongation falls. That is work hardening, and it cannot be avoided — the ribbon has to be reduced to size somehow.

Solder that work-hardened copper into a module and the contraction described above arrives at the cell undiminished. Cells bow, microcracks appear, and they are frequently invisible at the stringer: the first clear evidence is an EL image taken after lamination.

So ribbon production always includes an annealing step. The copper is heated above its recrystallization temperature, new grains grow, and the work hardening is removed. Yield strength falls sharply, elongation rises, and the stress that reaches the cell falls with it.

Whether softer is always better is the obvious next question, and the answer is no. Below a certain yield strength, three things start going wrong on the module line.

- **Tension in the stringer stretches it.** A ribbon that yields under pull comes out thinner and longer than it went in, which shows up as an unstable wire diameter and placement errors on the cell.
- **Straightness degrades.** Fine round wire bends more easily during payoff, threading and spool travel, and positioning accuracy suffers with it.
- **Lamination deforms it.** Under laminator pressure and temperature, a ribbon that is too soft flattens or shifts.

Yield strength is therefore a window rather than a maximum, and the window narrows as cells get thinner and ribbons finer. Holding annealing temperature, line speed and furnace atmosphere inside that window — and holding them constant between batches — is one of the core process capabilities in ribbon production.

One more copper property deserves a line of its own: surface quality. Scratches, burrs and oxide spots left by drawing or rolling give the coating a poor surface to adhere to and a thickness that varies around the wire. The result is a joint that is well filled on one side and starved on the other. On a 0.26 mm round wire the surface is a far larger share of the cross-section than it is on a 6 mm busbar, so the same defect costs more.

## Where Those Properties Are Set, and Where They Bite

Grade, hardness and coating all come out of one sequence: casting, drawing or rolling to final size, annealing, tinning through a solder pot, then slitting and spooling. Two stages decide most of what the module line will feel. The annealing stage sets yield strength and elongation; the tinning stage sets coating composition, thickness and uniformity. A coil that drifts at either stage produces ribbon that passes a visual inspection and fails somewhere further down.

On the equipment side, that sequence is what a [PV ribbon wire drawing and tinning line](https://www.ooitech.com/photovoltaic-ribbon-wire-drawing-and-tinning-integrated-production-line.html) is built around, and busbar ribbon passes through the same stages on a [drawing, rolling and tinning line](https://www.ooitech.com/pv-busbar-ribbon-integrated-drawing-rolling-tinning-production-line.html). Downstream, the properties land in different places.

- **The stringer** applies tension and places the ribbon. Too soft shows up first, as diameter drift and placement error; too hard shows up later, as cell bow and microcracks. The [MBB tabber stringer](https://www.ooitech.com/am050fh-mbb-pv-cell-soldering-stringer-fully-automatic-solar-cell-tabber-stringer-machine-ooitech.html) is where that trade is settled for every cell it touches.
- **Layup and lamination** apply pressure and heat, and a ribbon with too little yield strength flattens or migrates.
- **The busbar and welding stations** join ribbon to ribbon, where coating alloy and flux decide how the second joint forms. The process is described in more detail in this note on the [busbar welding machine](https://www.ooitech.com/busbar-welding-machine-in-solar-module-manufacturing-working-principle-process-and-key-benefits.html).
- **Thermal cycling and damp heat** are the only places where the long-term consequence of the alloy choice becomes visible, which is why the certificate matters less than the test report behind it.

There is a practical implication for incoming inspection, whether a company makes ribbon or buys it. Yield strength and elongation, coating thickness and its uniformity, surface condition and straightness are all worth a per-lot check. Each is cheap to measure compared with the cost of finding the same defect in an EL image after lamination.

## Coating Alloys: Four Systems and What Each One Trades Away

The coating is the solder. During stringing it melts, wets the silver gridlines on the cell, and the joint forms as it solidifies. Choosing the alloy is a four-way trade between melting point, wetting behaviour, long-term reliability and environmental rules.

**Sn63Pb37 (tin-lead).** The classic eutectic, melting at about 183 °C. It wets well, tolerates a wide process window, costs little and resists tin whiskers. It remains the mainstream coating for conventional cells.

**Sn62Pb36Ag2 (tin-lead-silver).** A small silver addition lowers the melting point slightly and, more usefully, suppresses the dissolution of silver from the gridlines into the molten solder. Less silver is eaten out of the gridline during soldering, and the joint is stronger for it.

**Sn42Bi58 (tin-bismuth).** A low-temperature eutectic at about 138 °C, used for cell types that tolerate little heat, such as heterojunction cells, and for thin wafers that are sensitive to thermal stress. Bismuth is brittle, the alloy is a poorer conductor, and the fatigue behaviour of the joint has to be verified rather than assumed.

**Lead-free (SAC305, SnCu and relatives).** It satisfies environmental requirements, at melting points generally above 217 °C. A higher soldering temperature means more thermal stress in the cell and a narrower process window.

| Coating | Melting point | Where it fits | What it costs |
| --- | --- | --- | --- |
| Sn63Pb37 | about 183 °C | Conventional cells; the default | Lead content rules it out in some markets |
| Sn62Pb36Ag2 | about 179 °C | Where gridline silver dissolution matters | Higher material cost |
| Sn42Bi58 | about 138 °C | HJT and thin cells sensitive to heat | Brittle joint, higher resistivity, fatigue needs testing |
| SAC305, SnCu | about 217 – 227 °C | Lead-free requirements | Higher soldering temperature; narrower window |

Why leaded ribbon is still mainstream is not only a question of performance and cost. European RoHS restricts lead in electrical and electronic equipment, but PV modules have long sat outside its scope and are handled at end of life mainly through the WEEE route. Some customers and markets nevertheless specify lead-free, so the process capability is needed even where the default is leaded.

Alloy choice does not stand alone. A low-temperature ribbon paired with low-temperature soldering reduces the thermal load on a thin cell, but the behaviour of that joint under thermal cycling has to be confirmed by TC testing; the initial pull strength says nothing about it. Flux belongs to the same decision, because it is what clears oxides at the moment of soldering so the solder can wet and spread. Change the coating and the activity and formulation of the flux usually need to change with it. The two are qualified together, not separately.

## Intermetallic Compounds: The Slow Variable in a Solder Joint

Soldering looks like melting and freezing, but the interface is chemistry. Tin from the coating reacts with the copper underneath and with the silver in the gridlines, forming intermetallic compound layers at the boundary: copper-tin and silver-tin phases. A thin, continuous intermetallic layer is what makes the joint a metallurgical bond rather than two surfaces in contact, and its presence is a good sign.

The complication is that the reaction does not stop when the solder freezes. The layer thickens slowly, faster at higher temperature and over the service life of the module. Intermetallic compounds are hard and brittle, and once the layer is thick the interface becomes a crack path: under thermal cycling the joint fails along the compound layer instead of deforming.

This is why two ribbons with the same initial pull strength can look different after ageing. Pull strength measured on the day of delivery is a starting point rather than a durability result, and any coating change has to be read together with the thermal-cycling data that follows it.

## Coating Thickness: The Part of the Section That Does Not Conduct

One fact is easy to overlook: the resistivity of the coating alloy is close to ten to twenty times that of the copper it covers.

So the coating is the solder and almost none of the conductor, while still occupying cross-section. Take a 0.26 mm round wire with a 15 µm coating on each side. The copper core is then only about 0.23 mm across, and its share of the cross-section is roughly 78%. The remaining 22% is, electrically speaking, along for the ride.

The finer the ribbon, the more this matters. The same 15 µm coating on a 0.18 mm round wire leaves the copper core about 70% of the section. That sensitivity is one reason ultra-fine ribbons used with busbar-less cell designs are specified with tight coating tolerances: shaving a few micrometres off the coating is the cheapest conductive section anyone is going to get.

Thin is not automatically better either.

- **Too thin** and there is not enough solder to fill the joint. Pull strength falls, and it falls further after storage, because an oxidised coating wets less readily.
- **Too thick** and the surplus squeezes out as solder balls or bridges, material is spent on a part of the section that does not conduct, and appearance and insulation can suffer.
- **Uneven** is often the worst of the three. An eccentric coating on round wire, or a coating thicker on one face than the other on a flat ribbon, produces a joint that is well filled on one side and starved on the other, and a wide scatter in pull strength across a single module.

A coating specification therefore has to state a mean thickness, a tolerance and a uniformity requirement. Storage conditions and shelf life belong in the same conversation, because the coating oxidises with time and solderability drops with it.

## Cost Reduction: Copper-Clad Aluminium, Thinner Ribbon, Low-Silver Coatings

Ribbon pricing is essentially the copper price plus a processing fee, which makes the metal the dominant variable. An illustrative calculation: a 182 mm module with 144 half-cells and sixteen 0.26 mm round ribbons carries roughly 0.27 kg of copper, about 0.21 kg of it in interconnect ribbon and 0.06 kg in busbar. At the September 2026 Shanghai spot price of about CNY 110,000 per tonne, that is around CNY 30 per module, or roughly CNY 0.05 per watt, before processing. Every CNY 10,000 per tonne move in the copper price shifts the module by about CNY 2.7.

Three routes follow from that arithmetic.

**Copper-clad aluminium.** An aluminium core with a copper cladding keeps much of copper's solderability and most of aluminium's weight and cost advantage. At 15% copper by volume and equal resistance, the estimated trade is a diameter about 21% larger, a weight about 60% of copper, and a raw material cost near 30%.

The diameter is the catch. On an interconnect ribbon the extra width sits in front of the cell and shades it, which takes back part of the gain. Three further questions have to be answered before copper-clad aluminium is a drop-in replacement: how strong and how stable the copper-aluminium interface is, because thermal cycling that cracks it raises resistance; what happens at a cut end, where the aluminium core is exposed to damp heat and forms a copper-aluminium galvanic couple; and how the lower strength and fatigue resistance of aluminium behave as the section gets finer. On the evidence so far, busbar ribbon is the easier entry point, since it is not size-critical and shades nothing. Interconnect ribbon needs the power, reliability and cost arithmetic done properly.

**Thinner and finer ribbon.** Reducing the section cuts copper directly and it is the same direction as the move to finer round wire. The limit is resistance loss, which is set by the cell's gridline design.

**Low-silver or silver-free coatings.** Silver is a small share of the coating and a real cost when the silver price is high. Replacing SnPbAg with SnPb where the reliability requirement allows is a straightforward saving.

| Direction | Saving | Main cost or risk |
| --- | --- | --- |
| Copper-clad aluminium | Large: raw material cost down to about 30% | Diameter up 21% and the shading that follows; interface and corrosion risks |
| Thinner, finer ribbon | Medium: depends on the cell design | Higher resistance loss; constrained by the gridline layout |
| Low-silver or silver-free coating | Small to medium: tracks the silver price | Joint strength and reliability need re-verification |

A saving only counts if it survives the power loss and the reliability risk. On ribbon, material cost and system performance have to be calculated together, which is why the same substitution can be obviously right on a busbar and obviously wrong on an interconnect wire.

## How to Read a Ribbon Datasheet

With the two-part model in hand, a datasheet reads differently. Each parameter is an answer to a specific failure mode.

| Parameter | What it controls | What to ask |
| --- | --- | --- |
| Copper grade (TU1, TU2, T2) | Resistivity, and how repeatable the annealing step is | Is there a certificate of analysis per lot? |
| Yield strength and elongation | Stress on the cell after soldering against handling on the line | Which test method, and what is the tolerance band? |
| Coating alloy | Soldering temperature and joint durability | Leaded or lead-free, and what reliability data stands behind it? |
| Coating thickness, per side | Solder volume against section that does not conduct | Mean, tolerance, and how is uniformity measured? |
| Surface and straightness | Coating adhesion and placement accuracy on the stringer | What camber is specified, and how is surface inspected? |
| Shelf life and packaging | Solderability after storage | Date code, sealed packaging, storage conditions |

That last row is the one most often missing from a purchase specification, and the one most likely to explain a sudden drop in pull strength on a line where nothing else has changed.

## FAQ

### What is a PV ribbon made of?

An oxygen-free copper core with a thin solder coating, typically 15 µm or so per side on round wire. The coating is one of four families: tin-lead, tin-lead-silver, tin-bismuth for low-temperature processes, or a lead-free alloy. Copper grades such as TU1 and TU2 are common, and the oxygen content is low enough that resistivity and annealing behaviour stay predictable.

### Why coat copper with solder at all?

Because solderability is the coating's entire job. Copper oxidises, and even clean copper is not what wets the silver gridlines and forms the joint. The coating melts during stringing, wets the cell metallization and solidifies into the solder joint. A bare copper ribbon would carry current perfectly well and fail to attach to the cell.

### Does a softer ribbon always mean less stress on the cell?

For the cell, yes: less stress reaches the silicon. For the line, no. Below a certain yield strength the ribbon stretches under stringer tension and loses diameter stability, straightness and positional accuracy, and it deforms more readily in the laminator. Yield strength is specified as a window, and the window is narrower for thin cells and fine round wire.

### Is lead-free ribbon required?

Not universally. European RoHS has long excluded PV modules from its scope, and end-of-life modules in Europe are handled mainly through WEEE. Many projects therefore still use leaded coatings, but a growing number of customers and markets specify lead-free. The trade is a soldering temperature roughly 35 to 45 °C higher than the leaded eutectic, which means more thermal load in the cell and a narrower process window.

### What is copper-clad aluminium ribbon used for?

Busbar ribbon first. Replacing copper with a copper-clad aluminium conductor raises the diameter by about 21% at equal resistance, and a wider interconnect ribbon shades the cell. Busbar ribbon does not sit in front of a cell, which removes that objection. Interconnect use also has to answer questions about interface stability under thermal cycling and galvanic corrosion where the aluminium core is exposed at a cut end.

### What should be checked in incoming inspection?

Yield strength and elongation per lot, coating thickness together with its uniformity, straightness or camber, surface condition, solderability after the storage period that the plant actually uses, and the date code on the packaging. All of them are cheaper to check at goods-in than to detect later in EL images, where the same defect has already been laminated into a module.

## Final Thoughts

Copper conducts, and copper hardness decides how much of the soldering stress reaches the cell. The coating solders, and the coating decides how long the joint lasts. Nearly every figure on a ribbon specification is a way of controlling one of those two jobs, and knowing which job a parameter belongs to tells you what it is protecting against. For a module line the practical version is shorter still: when pull strength, microcrack counts or placement accuracy move, the answer is usually in the material rather than in the machine settings.

Resistivity, density, expansion coefficient and melting point values are common reference figures and vary slightly between sources. The copper consumption and cost figures are an illustrative calculation based on a 182 mm, 144 half-cell module with sixteen 0.26 mm round ribbons and the September 2026 Shanghai copper spot price; they exclude processing cost and will move with the market. Coating thickness figures are examples. Confirm grade designations and tolerances against GB/T 5231 and the supplier's own certificate of analysis.

Related: [What a PV ribbon does: three jobs, one trade-off](https://www.ooitech.com/what-a-pv-ribbon-does-three-jobs-one-trade-off.html) steps back from the material and asks what the ribbon is actually being asked to do in a module.

Related: [How PV ribbon is made: drawing, annealing and tinning](https://www.ooitech.com/how-pv-ribbon-is-made-drawing-annealing-and-tinning.html) takes the copper and coating questions further into material selection.

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