A solid strategy to realize heteroface selective emitter and rear passivated silicon solar cells
Corresponding Author
Shuai Zou
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Correspondence
Shuai Zou and Xiaodong Su, School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, 1 Shizi Street, Suzhou 215006, China.
Email: [email protected]; [email protected]
Search for more papers by this authorXiaoya Ye
Research & Development Department, Canadian Solar Inc., Suzhou, China
Search for more papers by this authorJianming Ding
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Search for more papers by this authorChengkun Wu
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Search for more papers by this authorShaozhou Wang
School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW, Australia
Search for more papers by this authorGiuseppe Scardera
School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW, Australia
Search for more papers by this authorMalcolm Abbott
School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW, Australia
Search for more papers by this authorYu Zhang
School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW, Australia
Search for more papers by this authorRonglei Fan
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Search for more papers by this authorYadong Xu
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Search for more papers by this authorXusheng Wang
Research & Development Department, Canadian Solar Inc., Suzhou, China
Search for more papers by this authorMingrong Shen
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Search for more papers by this authorCorresponding Author
Xiaodong Su
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Correspondence
Shuai Zou and Xiaodong Su, School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, 1 Shizi Street, Suzhou 215006, China.
Email: [email protected]; [email protected]
Search for more papers by this authorCorresponding Author
Shuai Zou
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Correspondence
Shuai Zou and Xiaodong Su, School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, 1 Shizi Street, Suzhou 215006, China.
Email: [email protected]; [email protected]
Search for more papers by this authorXiaoya Ye
Research & Development Department, Canadian Solar Inc., Suzhou, China
Search for more papers by this authorJianming Ding
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Search for more papers by this authorChengkun Wu
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Search for more papers by this authorShaozhou Wang
School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW, Australia
Search for more papers by this authorGiuseppe Scardera
School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW, Australia
Search for more papers by this authorMalcolm Abbott
School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW, Australia
Search for more papers by this authorYu Zhang
School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW, Australia
Search for more papers by this authorRonglei Fan
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Search for more papers by this authorYadong Xu
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Search for more papers by this authorXusheng Wang
Research & Development Department, Canadian Solar Inc., Suzhou, China
Search for more papers by this authorMingrong Shen
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Search for more papers by this authorCorresponding Author
Xiaodong Su
School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, China
Correspondence
Shuai Zou and Xiaodong Su, School of Physical Science and Technology, and Jiangsu Key Laboratory of Thin Films, Soochow University, 1 Shizi Street, Suzhou 215006, China.
Email: [email protected]; [email protected]
Search for more papers by this authorFunding information: Priority Academic Program Development of Jiangsu Higher Education Institutions; National Natural Science Foundation of China; National Key R&D Program of China
Abstract
Passivated emitter and rear cell (PERC) with laser-doped selective emitter (SE) has become mainstream in the PV industry. In this work, we report a solid strategy to realize heteroface monocrystalline silicon (mono-Si) wafers for PERC-SE solar cells by employing alkaline polishing to form a polished surface for the rear side and well-established metal-catalyzed chemical etching to form a honeycomb texture for the front side in one wet process successively. The key to success lies in the fact that the two back-to-back wafers inserted into one slot in the cassette are tightly attached together in MCCE etching so that only the exposed surfaces are etched to form textures, while the rear polished surfaces are still retained to avoid wrap-around etching. With the strategy, the mono-Si PERC-SE solar cells achieve an average efficiency of over 22.0%, no poorer than that of the reference system (traditional alkaline texturing and rear acidic polishing), and have good light trapping capability for oblique incident light. Moreover, the total Si removal in the novel process is only ~0.4 g, which is far less than that in the traditional process. More importantly, the strategy can also double the throughput of existing texturing processes and significantly reduce the amount of etching waste. Therefore, the work is expected to provide a promising way to mass produce efficient mono-Si PERC-SE solar cells with a superior rear surface, achieved without increasing the number of processing steps, and lower cost.
Open Research
DATA AVAILABILITY STATEMENT
The data that support the findings of this study are available from the corresponding author upon reasonable request.
Supporting Information
| Filename | Description |
|---|---|
| pip3594-sup-0001-Figures_S1-S3.docxWord 2007 document , 8.4 MB |
FIGURE S1 Digital photos of the rears of the back-to-back wafers after MCCE etching. The reaction temperature is (A) 60°C, (B) 50°C, (C) 40°C, and (D) 30°C, respectively. According to the weight losses of the wafers before and after the MCCE etching, the corresponding v value is 0.48 mg/s, 0.39 mg/s, 0.31 mg/s, and 0.25 mg/s, respectively. Figure S2 Image of a local area of the laser doped pattern measured by a secondary element image measuring instrument. Top picture: the corresponding partial enlargement. Figure S3 The scatter values of series resistance (Rs) and contact resistivity (ρC) for the two different groups cells. |
Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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