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    "title": "TBC Solar Cell Technology (TOPCon Back Contact): Full Process Guide -  - Ooitech, the world's leading solar panel production line solutions provider, supply chain expert, solar panel making machine facotry",
    "description": "A detailed walkthrough of TBC (TOPCon Back Contact / POLO-IBC) solar cell technology, covering its structure, complete process flow, and the key control points that matter most in production.",
    "keywords": "TBC solar cell, TOPCon Back Contact, POLO-IBC, back contact cell, N-type solar cell, tunnel oxide passivation, IBC process flow",
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        {
            "level": 2,
            "text": "TBC Solar Cell Technology (TOPCon Back Contact): Full Process Guide"
        },
        {
            "level": 3,
            "text": "TBC Solar Cell Technology (TOPCon Back Contact): Full Process Guide"
        },
        {
            "level": 5,
            "text": "Technology Overview"
        },
        {
            "level": 6,
            "text": "What is a TBC cell?"
        },
        {
            "level": 6,
            "text": "Core advantages"
        },
        {
            "level": 6,
            "text": "How it compares with conventional cells"
        },
        {
            "level": 5,
            "text": "Full Process Flow Overview"
        },
        {
            "level": 5,
            "text": "Detailed Process Specifications"
        },
        {
            "level": 6,
            "text": "3.1 Cleaning and polishing (pre-clean + saw damage removal)"
        },
        {
            "level": 6,
            "text": "3.2 Tunnel oxide + poly-Si deposition"
        },
        {
            "level": 6,
            "text": "3.3 Rear SiN mask deposition"
        },
        {
            "level": 6,
            "text": "3.4 First rear laser opening (boron diffusion window)"
        },
        {
            "level": 6,
            "text": "3.5 Rear boron doping (p-poly)"
        },
        {
            "level": 6,
            "text": "3.6 Second rear laser opening (phosphorus diffusion window)"
        },
        {
            "level": 6,
            "text": "3.7 Rear phosphorus doping (n-poly)"
        },
        {
            "level": 6,
            "text": "3.8 Cleaning to strip wrap-around diffusion (BSG/PSG removal)"
        },
        {
            "level": 6,
            "text": "3.9 Rear SiN passivation protective film deposition"
        },
        {
            "level": 6,
            "text": "3.10 Rear wax mask coating (protective mask)"
        },
        {
            "level": 6,
            "text": "3.11 Front chemical etching + wax stripping and cleaning"
        },
        {
            "level": 6,
            "text": "3.12 Front and rear SiN anti-reflection passivation film"
        },
        {
            "level": 6,
            "text": "3.13 Rear electrode screen printing and firing"
        },
        {
            "level": 6,
            "text": "3.14 Back-end inspection and sorting"
        },
        {
            "level": 5,
            "text": "Key Challenges and What to Focus On"
        },
        {
            "level": 6,
            "text": "Key SPC parameters to watch"
        },
        {
            "level": 5,
            "text": "Ooitech's View"
        },
        {
            "level": 5,
            "text": "Tags :"
        },
        {
            "level": 5,
            "text": "Category"
        },
        {
            "level": 5,
            "text": "Recent Post"
        },
        {
            "level": 6,
            "text": "TBC Solar Cell Technology (TOPCon Back Contact): Full Process Guide"
        },
        {
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            "text": "Solar Module Stringing: A Practical Guide to Troubleshooting Cold Solder Joints (With Mind Map)"
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            "text": "What Is Balcony Solar? A Plug-and-Play PV System Explained"
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            "text": "Solar Rooftops You Cannot Afford to Ignore: A Complete Guide to Pitched and Flat Roof PV Systems"
        },
        {
            "level": 6,
            "text": "Solar Cell Stringer Machine Market and Technology Report 2026: TOPCon, BC, HJT and 0BB Trends"
        },
        {
            "level": 5,
            "text": "Popular Tags"
        },
        {
            "level": 3,
            "text": "Request A Quote"
        },
        {
            "level": 2,
            "text": "We deliver expertise you can trust our service"
        },
        {
            "level": 3,
            "text": "Cost-Effective Advantages"
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        {
            "level": 3,
            "text": "Our Experience Team"
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        {
            "level": 3,
            "text": "15+ Years Industry Experience"
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        {
            "level": 2,
            "text": "What Our Client Say's about us"
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        {
            "level": 3,
            "text": "Jizzakh Polytechnic Institute"
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        {
            "level": 3,
            "text": "KTECH"
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        {
            "level": 3,
            "text": "Mark"
        },
        {
            "level": 3,
            "text": "Amjad"
        },
        {
            "level": 2,
            "text": "Our Latest Products"
        },
        {
            "level": 3,
            "text": "Interconnection Busbar – Solar Cell String Current Collection"
        },
        {
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            "text": "BD03 Frame Gluing Machine – Aluminum Frame Sealant System"
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            "text": "Solar Panel Tester Sun Simulator OTMT-A | AAA Class Solar Module IV Tester | Ooitech"
        },
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            "text": "Solar Junction Box – Bypass Diode, IP67, PV Module Output"
        },
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            "text": "Junction Box Welding Machine KS-01C | Automatic Solar Panel Junction Box Soldering Equipment - Ooitech"
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            "text": "Solar Panel EL Tester & VI Tester Machine OPT-M960B M951B M950B | Ooitech Solar Module EL Testing Equipment"
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    "markdown": "# TBC Solar Cell Technology (TOPCon Back Contact): Full Process Guide -  - Ooitech, the world's leading solar panel production line solutions provider, supply chain expert, solar panel making machine facotry\n\n> A detailed walkthrough of TBC (TOPCon Back Contact / POLO-IBC) solar cell technology, covering its structure, complete process flow, and the key control points that matter most in production.\n\n![TBC Solar Cell Technology (TOPCon Back Contact): Full Process Guide](https://cdn.ooitech.com/static/upload/image/20260712/b328022a0ca3c179e39311d2ccf4fb5d.webp)\n\n- ** 2026-07-12\n- ** 0 Views\n- ** [Blog](/Blog.html)\n\n### TBC Solar Cell Technology (TOPCon Back Contact): Full Process Guide\n\n##### Technology Overview\n\nThe content below is shared for reference only. If there is any technical infringement or incorrect guidance, feel free to contact the author for removal or correction.\n\n###### What is a TBC cell?\n\nTBC stands for TOPCon Back Contact. It fuses TOPCon passivation (tunnel oxide plus poly-silicon) with the IBC interdigitated back contact structure, so people also call it a POLO-IBC cell.\n\nIt deep-integrates the TOPCon tunnel oxide / poly-Si passivation with the IBC back contact layout. That gives you the strong rear passivation of TOPCon plus the IBC advantage of no front gridline shading, with all current collection moved to the back. The result is higher open-circuit voltage and higher short-circuit current. It's one of the mainstream N-type high-efficiency routes for the next generation.\n\n###### Core advantages\n\n- No front metal gridlines, so front shading loss is removed and Isc goes up\n- TOPCon tunnel passivation lowers rear recombination and lifts Voc\n- The interdigitated P/N back contact layout optimizes the carrier collection path and cuts series resistance\n- Compared with standard TOPCon and standard IBC, it balances passivation quality and structural integration\n- Compatible with most core equipment on existing N-type lines, so the process can be upgraded step by step\n\n###### How it compares with conventional cells\n\n- Standard TOPCon: front gridline shading, full-area TOPCon passivation on the rear\n- Standard IBC: back contact structure, but passivation relies on silicon oxide / silicon nitride, no tunnel poly-Si passivation\n- TBC (POLO-IBC): IBC back contact structure plus integrated TOPCon tunnel passivation, so both structure and passivation are optimized\n\n##### Full Process Flow Overview\n\nWafer incoming → pre-cleaning / saw damage removal → rear tunnel oxide + poly-Si deposition (LPCVD) → rear SiN mask deposition → first rear laser opening (boron area) → boron doping (p-poly) → second rear laser opening (phosphorus area) → phosphorus doping (n-poly) → cleaning to strip wrap-around diffusion / BSG / PSG → rear passivation film deposition → wax mask printing to protect the rear → front texturing + P/N isolation etch → front and rear SiN anti-reflection passivation film deposition → rear metal electrode screen printing → firing → electrical test → sorting and packing\n\n##### Detailed Process Specifications\n\n###### 3.1 Cleaning and polishing (pre-clean + saw damage removal)\n\nPurpose: remove the saw damage layer, surface metal impurities, particles and oil; polish the wafer single or double sided to get a clean, flat silicon base and keep the later tunnel layer deposition uniform.\n\nMain equipment: inline wet cleaning and polishing line, alkaline polishing tank, acid cleaning tank.\n\nKey chemicals: strong alkali (NaOH/KOH), HF, HCl, IPA, texturing additive, surfactant.\n\nKey monitoring items:\n\n- Polishing weight loss: electronic balance\n- Surface reflectance: reflectance tester\n- Minority carrier lifetime iVoc: WCT-120 transient lifetime tester\n- Carrier recombination imaging: PL tester (R3-PL)\n- Surface roughness and cleanliness: optical microscope\n\nQuality control: saw damage fully removed, no stains or steps on the surface, uniform weight loss, no obvious lifetime drop.\n\n###### 3.2 Tunnel oxide + poly-Si deposition\n\nPurpose: grow an ultra-thin tunnel oxide (SiO₂) then an intrinsic poly-Si layer on the wafer rear, forming the core TOPCon passivation structure for strong field and chemical passivation and low rear recombination.\n\nMain equipment: tube LPCVD.\n\nGas sources: SiH₄, O₂, N₂ (carrier / purge).\n\nKey items:\n\n- Poly-Si thickness: poly thickness tester, ellipsometer\n- Tunnel oxide thickness: ECV, ellipsometer\n- iVoc (WCT-120)\n- PL uniformity\n- Sheet resistance (intrinsic poly monitoring before doping)\n\nQuality control: oxide ultra-thin and uniform, poly-Si dense and pinhole-free, good thickness consistency across the wafer.\n\n###### 3.3 Rear SiN mask deposition\n\nPurpose: deposit a dense silicon nitride (SiNₓ) layer on the intrinsic poly-Si as a blocking mask for the later laser opening and doping steps, enabling selective doping zones.\n\nMain equipment: PECVD.\n\nGas sources: SiH₄, NH₃, N₂.\n\nKey items: SiN thickness (spectroscopic ellipsometer), refractive index and uniformity, iVoc, PL uniformity.\n\nQuality control: dense mask, no pinholes, uniform thickness to guarantee doping isolation.\n\n###### 3.4 First rear laser opening (boron diffusion window)\n\nPurpose: selectively remove the SiN mask over the boron diffusion area by local laser ablation while keeping the intrinsic poly-Si underneath, opening the window for the later p-type poly.\n\nMain equipment: fiber / nanosecond or picosecond laser opening system, high-precision laser patterning tool.\n\nProcess tuning: adjust laser power, repetition rate, scan speed and spot overlap so only the top SiN mask is removed and the intrinsic poly-Si below is not damaged, keeping the passivation base intact.\n\nKey characterization: optical microscope check of groove shape, edge integrity, and whether the poly layer is burned.\n\n###### 3.5 Rear boron doping (p-poly)\n\nPurpose: boron-diffuse the intrinsic poly-Si in the opened area to convert it into p-type heavily doped poly (p-poly), while forming BSG on the surface. The BSG later acts as a natural blocking mask for phosphorus diffusion.\n\nMain equipment: tube boron diffusion furnace.\n\nProcess media: liquid source BBr₃; ambient O₂, N₂.\n\nKey characterization: p-zone sheet resistance, doping uniformity, BSG coverage integrity, PL doping uniformity.\n\nQuality control: sufficient boron doping, uniform sheet resistance, continuous and complete BSG with no local gaps.\n\n###### 3.6 Second rear laser opening (phosphorus diffusion window)\n\nPurpose: remove the remaining SiN mask to expose the undoped intrinsic poly-Si as the n-type phosphorus doping zone, while keeping the already formed BSG layer intact from laser damage.\n\nMain equipment: laser patterning / opening system.\n\nProcess focus: precise laser energy control to avoid punching through the BSG layer, keeping a clean isolation boundary between P and N zones.\n\n###### 3.7 Rear phosphorus doping (n-poly)\n\nPurpose: phosphorus-diffuse the second-window intrinsic poly-Si to form n-type heavily doped poly (n-poly). The BSG formed in the previous step works as a self-aligned mask, blocking phosphorus from diffusing into the p-poly area and achieving self-isolation of the P/N zones.\n\nMain equipment: tube phosphorus diffusion furnace.\n\nProcess media: liquid source POCl₃; ambient O₂, N₂.\n\nKey principle: the residual BSG acts as a natural diffusion barrier and stops phosphorus contamination of the p-poly area. After phosphorus diffusion the BSG partly turns into a boron-phosphorus mixed oxide, which further strengthens the isolation.\n\nKey characterization: n-zone sheet resistance, P/N boundary isolation, leakage trend monitoring.\n\n###### 3.8 Cleaning to strip wrap-around diffusion (BSG/PSG removal)\n\nPurpose: chemically remove all BSG, PSG and surface residues, and strip the edge wrap-around and side doping layers to avoid edge leakage.\n\nMain equipment: inline wet cleaning line.\n\nKey chemicals: mainly HF, plus acidic additives and a buffered acid system.\n\nProcess aids: clean dry air blow-off, hot air drying.\n\nQuality control: oxide glass fully removed, clean surface with no residue, no wrap-around residue at the edges.\n\n###### 3.9 Rear SiN passivation protective film deposition\n\nPurpose: deposit a SiN passivation protective film on the rear interdigitated P/N poly structure to passivate and protect the back contact area and block chemical attack in later steps.\n\nMain equipment: PECVD.\n\nGas sources: SiH₄, NH₃, N₂.\n\nCharacterization: SiN thickness, refractive index, film uniformity.\n\n###### 3.10 Rear wax mask coating (protective mask)\n\nPurpose: fully coat the rear with a wax protective layer by screen printing to shield the formed P/N back contact structure and SiN film, preventing the later front etch from attacking the rear functional layers.\n\nMain equipment: screen printer (wax printing station).\n\nControl focus: complete wax printing, no skip printing, no pinholes, good edge sealing so the rear stays protected throughout.\n\n###### 3.11 Front chemical etching + wax stripping and cleaning\n\nPurpose:\n\n1. Remove excess doping and damage layers on the wafer front\n2. Texture the front to form a pyramid surface and cut front reflection\n3. Achieve edge isolation between the rear P and N zones through lateral etching to reduce edge leakage\n4. Finally strip the rear wax mask to expose the complete back contact structure\n\nMain equipment: double-sided inline wet etching and texturing line.\n\nKey chemicals: strong alkali (NaOH), HF, texturing additive, buffered etchant.\n\nGas sources: clean compressed air, N₂ blow-off.\n\nQuality control: uniform front texturing, qualified pyramid morphology, proper P/N isolation, no leakage path, clean wax stripping with no residue.\n\n###### 3.12 Front and rear SiN anti-reflection passivation film\n\nPurpose: deposit a SiN anti-reflection passivation film on the front for both anti-reflection and surface passivation; add and optimize the rear passivation film to further improve passivation and reliability.\n\nMain equipment: PECVD.\n\nGas sources: SiH₄, NH₃, N₂.\n\nCharacterization: front and rear film thickness, refractive index, minority carrier lifetime, reflectance.\n\n###### 3.13 Rear electrode screen printing and firing\n\nPurpose: print silver-aluminum electrodes on the rear P zone and silver electrodes on the n-type poly zone to form the interdigitated back contact positive and negative electrodes, then use high-temperature firing to form ohmic contact between the metal and the doped poly-Si.\n\nMain equipment: dedicated back contact screen printer, inline firing furnace.\n\nKey steps: rear electrode pattern alignment printing → drying → high-temperature firing (forming ohmic contact).\n\n###### 3.14 Back-end inspection and sorting\n\nProcess content: EL inspection (defects, micro-cracks, leakage), IV electrical test (Voc, Isc, FF, Eff), appearance inspection, grading and sorting, packing and warehousing.\n\nInspection equipment: EL tester, IV tester, appearance inspection station.\n\n##### Key Challenges and What to Focus On\n\nWhat are the tough parts of TBC technology, and where should attention go?\n\n- Controlling the thickness uniformity of the ultra-thin tunnel oxide is hard\n- The two laser opening steps demand extremely high alignment accuracy\n- Keeping the BSG self-aligned mask intact is the core of the process\n- The P/N interdigitated isolation etch is prone to edge leakage\n- Back contact electrode printing needs higher alignment accuracy than conventional cells\n- Managing minority carrier lifetime decay across the whole flow is difficult\n\n###### Key SPC parameters to watch\n\n- Tunnel oxide thickness and poly-Si thickness\n- Laser opening morphology and alignment deviation for both steps\n- Sheet resistance uniformity of boron and phosphorus diffusion\n- iVoc and PL minority carrier lifetime tracked across the whole flow\n- Front reflectance and texturing morphology\n- EL micro-cracks, leakage, and edge isolation status\n\n##### Ooitech's View\n\nTBC lives or dies on the details, and the BSG self-aligned mask is the quiet hero here since it lets phosphorus and boron zones sort themselves out without a third mask step. What we watch most on module lines is how these high-Voc back contact cells behave downstream in stringing and lamination, because their all-rear metallization changes the interconnection game. If you want to see real N-type module lines running, our YouTube channel [www.youtube.com/ooitech](http://www.youtube.com/ooitech) has factory footage worth a look.\n\n---\n\n##### Tags :\n\n\n![](/template/ooitech/assets/img/shape/06.png)\n\n![](https://cdn.ooitech.com/static/upload/image/20250909/1757399770541443.webp)\n\n### Request A Quote\n\nAll uploads are secure and confidential.\n\n## We deliver expertise you can trust our service\n\nDirect-from-Factory Equipment.\n\n![](/template/ooitech/assets/img/icon/money-2.svg)\n\n### Cost-Effective Advantages\n\nWe deliver exceptional value, maximizing results while optimizing budgets for clients.\n\n![](/template/ooitech/assets/img/icon/staff.svg)\n\n### Our Experience Team\n\nOur skilled professionals specialize in innovative solutions and tailored strategies.\n\n![](/template/ooitech/assets/img/icon/certified.svg)\n\n### 15+ Years Industry Experience\n\nDeep expertise ensures reliable, trend-aware, and proven outcomes for success.\n\n![](https://cdn.ooitech.com/static/upload/image/20250910/1757477357667605.webp )\n\n![](https://cdn.ooitech.com/static/upload/image/20250910/1757477724911512.webp)\n\n![](/template/ooitech/assets/img/shape/06.png)\n\n## What Our Client Say's about us\n\nClient testimonials praise our deep understanding of their challenges, which leads to innovative solutions and strong ROI. 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The kindest person and professional in his field\n\n![](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_2026041716444445.webp)\n\n### Jizzakh Polytechnic Institute\n\n![](/template/ooitech/assets/img/icon/quote.svg)\n\nThanks to Ooitech for providing highly suitable BC solar cell experimental equipment.\n\n![](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_1776426122864564.webp)\n\n### KTECH\n\n![](/template/ooitech/assets/img/icon/quote.svg)\n\nThank you again so much again for the very big big help for improving and fixing the factory and also teaching the workers how to use the machines\n\n![](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_1757479675272137.webp)\n\n### Mark\n\nBIPV Philippines\n\n![](/template/ooitech/assets/img/icon/quote.svg)\n\nThanks to Ooitech for providing the fully automated production equipment—your installation and after-sales service have been excellent.\n\n![](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_2026041720921238.webp)\n\n### Amjad\n\n## Our Latest Products\n\n![Interconnection Busbar – Solar Cell String Current Collection](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_2026032713037538.jpg.webp)\n\n- [** Rachael](/Interconnection-Busbar-for-Solar-Module-Assembly-High-Performance-Current-Collection-Solution.html)\n- [** 96326](/Interconnection-Busbar-for-Solar-Module-Assembly-High-Performance-Current-Collection-Solution.html)\n\n### Interconnection Busbar – Solar Cell String Current Collection\n\nPremium interconnection busbar solutions for solar module assembly, featuring high-purity tinned copper construction, optimized cross-sectional design for minimal power loss, and reliable current collection from cell strings to junction boxes. 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Supports 5BB-12BB full cell, half-cut, and bifacial modules. Cycle time ≤16s with 99.6% welding quality\n\n![Solar Panel EL Tester & VI Tester Machine OPT-M960B M951B M950B | Ooitech Solar Module EL Testing Equipment](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_1774351816741704.webp)\n\n- [** Rachael](/solar-panel-el-tester-and-vi-tester-machine-opt-m960b-m951b-m950b-ooitech-solar-module-el-testing-equipment.html)\n- [** 43207](/solar-panel-el-tester-and-vi-tester-machine-opt-m960b-m951b-m950b-ooitech-solar-module-el-testing-equipment.html)\n\n### Solar Panel EL Tester & VI Tester Machine OPT-M960B M951B M950B | Ooitech Solar Module EL Testing Equipment\n\nOoitech offers professional solar panel EL tester and VI tester machines (OPT-M960B, OPT-M951B, OPT-M950B) with SONY industrial cameras, automatic image mosaicing, MES interfacing, and high-precision electroluminescence and visual inspection for solar mod\n",
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