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成果報告書詳細
管理番号20170000000078
タイトル*平成27年度中間年報 高性能・高信頼性太陽光発電の発電コスト低減技術開発 先端複合技術型シリコン太陽電池、高性能CIS太陽電池の技術開発 結晶Si太陽電池をベースとした複合型太陽電池モジュールの開発
公開日2017/4/8
報告書年度2015 - 2015
委託先名株式会社カネカ
プロジェクト番号P15003
部署名新エネルギー部
和文要約
英文要約Title:, Development of high performance and reliable PV modules to reduce levelized cost of energy, technological development of advanced composite silicon solar cells and high-performance CIS solar cells, research and development of combined-type solar cell module based on crystalline Si solar cell (FY 2015-2017) FY 2015 Annual Report

(1) Development of high-efficiency back contact heterojunction crystalline Si solar cell
 As a part of a fundamental development of high-efficiency back contact heterojunction (BCHJ) crystalline Si (c-Si) solar cell, using HJ c-Si solar cells with both-side-contact structure, we have improved qualities of heterojunction (HJ) and electrode and optimized their process conditions. By this work, carrier recombination at the HJ and resistive loss at electrode have been reduced. As the result, we have achieved a certified 25.1% conversion efficiency in a large area HJ c-Si solar cell. This efficiency is a world record in a both-side-contacted c-Si solar cell.
 In addition to the development of the cell fabrication technology, we also investigated the impact of the carrier recombination to the solar cell performance in detail and revealed that the reduction of carrier recombination centers at the HJ should be one of the most crucial issues for further improvement of FF even in the HJ c-Si solar cells with efficiency over 25%, but less effective to improve Voc.
 For the BCHJ c-Si solar cell, we have developed a patterning process for 6-inch area cell to define the cell structure and an electrode which has an advantage of low resistance. Using the newly-developed electrode, we have demonstrated that the electrode resistance is reduced to < 5% than that of conventional both-side-contact structure HJ c-Si solar cell, which enables the development of high-efficiency BCHJ c-Si solar cell.

(2) Development of combined-type solar cell based on c-Si solar cell
To obtain fundamental data to design a combined-type solar cell, optical simulation of the combined type solar cell with different structures and materials has been performed, which clarified the impact of the structures of the combined-type solar cell and optical properties of each elemental cell to the photovoltaic properties. Experimental setups to prepare elemental cells have been installed, and we have evaluated trial designs of cell structure and selected candidates for top cell material.
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