成果報告書詳細
管理番号20140000000286
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 三層協調界面構築による高効率・低コスト・量産型色素増感太陽電池の研究開発 (高効率タンデム化技術に関する研究開発)
公開日2015/2/19
報告書年度2013 - 2013
委託先名国立大学法人九州工業大学
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We are aiming at cocktail dye sensitized solar cells in order to attain high efficiency. They consist of two dyes. One covers visible light region and the other covers near infrared region, resulting in covering wide range of wavelength from 400 to 900 nm. According to our simulation, best performance should be attained by using dye having absorption spectrum edge of 900nm. Therefore, we designed near IR dyes with 900 nm absorption spectrum edge. We focused on phthalocyanine with –S-R substituents at α position of the phthalocyanine ring because they have absorption spectral edge of 900nm. To begin with, S-substituted Zn phthalocyanine derivatives (commonly employed) were synthesized and the photovoltaic performances were evaluated. The incident photon to current efficiency (IPCE) was low, 0.1 at 800nm, probably because of dye aggregation and fast charge recombination. In order to retard these issues, bulky axial substituent (-O-Si(Hex)3) were introduced in the Si atom located at the center of the S-substitued phthalocyanine ring. In addition, OMe substituents were introduced into the phenyl group bonding to the phthalocyanine ring. After introducing these bulky groups, IPCE increased from 0.1 to 0.6 at 800nm. It was found that electron injection rate increased after the introduction of these bulky groups. This suggests that high angle between dye molecular plane and TiO2 surface may assist the first electron injection. We successfully proposed direction of molecular design for high efficiency dye sensitized solar cells.
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