成果報告書詳細
管理番号20130000000527
タイトル*平成24年度中間年報 最先端研究開発支援プログラム 低炭素社会に資する有機系太陽電池の開発 光電変換の原理解明に基づく高効率有機薄膜太陽電池の開発
公開日2014/5/9
報告書年度2012 - 2012
委託先名国立大学法人京都大学
プロジェクト番号P09026
部署名新エネルギー部
和文要約
英文要約Funding Program for World-Leading Innovative R&D on Science and Technology / Development of Organic Photovoltaics toward a Low-Carbon Society / Development of Highly Efficient Organic Solar Cells Based on Photovoltaic Conversion Mechanism
(FY2010-FY2013) FY2012 Annual Report

Sub-theme II
II-1. Spectroscopic Analysis of Organic Solar Cells
(From the first quarter to the fourth quarter of 2012)
In 2012, we have addressed spectroscopic analysis of photovoltaic conversion processes in typical low-bandgap polymer/fullerene solar cells and novel polymer/fullerene and polymer/polymer solar cells that were provided by collaborative research groups. For low-bandgap polymer/fullerene (PCPDTBT/PCBM) blends, we found that the geminate recombination of the interfacial CT state is the origin of the low external quantum efficiency (EQE) of the solar cells. For fluorene-based copolymer/fullerene (N-P7/PCBM) blends (provided by Toray), we found that the geminate recombination of the interfacial CT state is the primary loss process and the bimolecular recombination is additional loss process in the thick device. For crystalline polymer/fullerene (JX-P/ICBA) blends (provided by JX), we found that the charge generation is in competition with the formation of polymer triplet state because of high CT state energy. For polymer/polymer (P3HT/PF12TBT) blends (provided by Sumitomo Chemical), we found that thermal purification of nanoscale-phase-separated domains increases the free-carrier generation efficiency and thus provides high EQE as a result of the reduced charge recombination within the domains.

Sub-theme III
III-4. Development of Highly Efficient Organic Solar Cells Based on Dye Sensitization
(From the first quarter to the fourth quarter of 2012)
In 2012, we have developed novel near-IR dye molecules for enhancing the light-harvesting efficiency in polymer/fullerene solar cells. As shown in Figure 2, different axial groups were introduced into SiPc molecules in order to control the dye location in polymer/fullerene blend films. Instead, blend films of P3HT and polystyrene (PS) were employed as a model system of P3HT/PCBM blends. As a result, we found that SiPctB6 is located in P3HT domains, SiPc6 is located at the P3HT/PS interface, and SiPcBz is located in PS domains. These dye locations are consistent with the prediction based on the wetting coefficient evaluated from the surface energy of each material. This finding suggests that the dye location can be controlled by careful materials design.
Furthermore, we also have demonstrated highly efficient device performance of P3HT/PCBM incorporating these dye molecules.
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