【摘 要】
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Understanding the early-time dynamics of excited state evolution and carrier generation at the heterojunction is of paramount importance in the design of narrow energy-gap organic dyes for further per
【机 构】
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State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of AppliedChemistry,Chines
【出 处】
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首届国际微纳米体系发光及光电性质学术会议
论文部分内容阅读
Understanding the early-time dynamics of excited state evolution and carrier generation at the heterojunction is of paramount importance in the design of narrow energy-gap organic dyes for further performance enhancement of mesoscopic titania solar cells.By choosing a simple triphenylamine electron-donor,we herein compare the influences of electron-acceptor,benzothiadiazole-benzoic acid(BTBA)vs cyanoacrylic acid(CA),on the energy levels,light absorption as well as dynamics of excited state evolution and electron injection.Density functional theory(DFT)and time-dependent DFT calculations have disclosed remarkable intramolecular rotations for the excited states of these two donor-acceptor dyes.The torsional motion occurs on the triphenylamine unit for the CA dye and the planarity of the aromatic backbone arises for the BTBA dye.Our femtosecond spectroscopic measurements have suggested the crucial role of having a long excited state lifetime to maintain a high electron injection yield,because the reduced driving force for a low energy-gap dye can give rise to slower electron injection dynamics.
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