成果報告書詳細
管理番号20140000000696
タイトル*平成25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 (ナノ表面・界面制御による超薄型シリコン・ヘテロ接合太陽電池)
公開日2015/1/31
報告書年度2013 - 2013
委託先名国立大学法人東京工業大学
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. (Research on high efficiency very thin Si heterojunction solar cell with nano-level controlled surface and interface ) (FY2010-2014) FY2013 Annual Report

(1) Development of passivation films: A new technique for contact formation through ALD-a-Al2O3 passivation layer was developed to suppress the surface recombination velocity at the contact region. The new technique is LTC (Laser Transfer Contact) technique in which Al deposited on a glass substrate is transferred to the Si substrate passivated by ALD-a-Al2O3. The transfer of Al is realized by using laser ablation. Compared with a conventional laser firing contact (LFC) technique, LTC effectively suppress laser damage to the substrate surface. The surface morphology of the samples prepared by LTC technique is flatter than that of the samples prepared by LFC technique. The samples prepared by LTC technique also show the significant improvement of the effective lifetime without deterioration of the electrical properties of the Al/c-Si contact. (2) Development of novel heterojunction solar cells: The characterization of n-type nanocrystalline cubic silicon carbide (nc-3C-SiC:H) heterojunction emitter was performed to improve the passivation quality of the emitter for textured c-Si. TEM (Transmission Electron Microscopy) observations revealed that the coverage of the nc-3C-SiC:H emitter layer on the textured surface is excellent. However, the passivation quality of nc-3C-SiC:H for the textured surface is poorer than that for the flat surface. To improve the passivation quality, the deposition conditions were optimized. It was found that higher substrate temperature is required to obtain better passivation quality for the textured surface. It is expected that the combination of the new deposition condition and the LTC technique will improve the solar cell performance.
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