成果報告書詳細
管理番号20140000000676
タイトル*平成24年度中間年報 太陽エネルギー技術研究開発 太陽光発電システム次世代高性能技術の開発 極限シリコン結晶太陽電池の研究開発 (次世代超薄型結晶シリコン太陽電池の低コスト・高効率化プロセス開発)
公開日2015/2/19
報告書年度2012 - 2012
委託先名シャープ株式会社
プロジェクト番号P07015
部署名新エネルギー部
和文要約
英文要約Title:High Performance PV Generation System for the Future. R and D on Ultimate Wafer-based Si Solar Cells. (Development of low cost and high efficiency manufacturing process for next generation ultra thin crystalline silicon solar cell) (FY2010-2014) FY2012 Annual Report

Development of next generation ultra thin high efficiency mono-crystalline silicon solar cell. To achieve the high efficiency, it is necessary to obtain quite high open circuit voltage (Voc) far exceeding 700 mV and quite high short circuit current density (Jsc). The Hetero-Junction (HJ) technology that consists of the crystalline silicon and hydrogenated amorphous silicon (a-Si:H) thin layer is the one of the most promising approaches to obtain the high Voc. On the other hand, Buck Contact (BC) structure allows the enhancement of Jsc since the electrode doesn’t exist on the front surface. We thought that we should be able to strike a balance between high Voc and Jsc by the combination of HJ and BC solar cell structure. Thus we are trying to develop the Hetero-Junction Back Contact (HJBC) solar cell. 1. Development of high quality pn junction formation technology. We tried to fabricate double sided Hetero-Junction solar cell samples as one of elemental technology developments of the final HJBC solar cell. As a result of the improvement in the technology of the Plasma Enhanced Chemical Vapor Deposition (PE-CVD) or previous cleaning process before the PE-CVD deposition and the tuning of the thickness of each a-Si:H layers, we have achieved high Voc exceeding 730 mV, expressing the feature of the HJ solar cell structure well. 2. Development of Hetero Junction Back Contact (HJBC) solar cell in which the technology of Back Contact (BC) solar cell and Hetero Junction (HJ) technology were united. We are trying to fabricate HJBC solar cell samples from the 2011FY continuously and we have drastically improved the cell efficiency from 14.5%(in-house measurement) to 22.3%(confirmed by Japan Electrical Safety & Environment Technology Laboratories) in 2012FY. The value of Jsc is fairly high comparing that of the double sided HJ solar cell indicating the effect of shading loss reduction by applying the BC structure. And the Voc also significantly high exceeding 700 mV indicating the feature of the HJ technology. Besides that, fill factor (F.F.) is slightly lower than the adequate value, meaning the cell conversion efficiency can be further enhanced by improving the F.F. We are also performing development of the simulation technology in order to accelerate the development of the HJBC solar cell. Obtaining cooperation of the consortium, we constructed the model for both the HJBC solar cell structure and double sided HJ solar cell structure. As a result, we obtained good agreement between experiments and the models in the cases of both HJBC and double sided HJ structure.
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