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Investigation of Ultrafast Electronic Transfer Process on Organic/Inorganic Heterojunction by Femtosecond Transient Absorption
Xue-cong Li,Ning Sui,Qing-hui Liu,Qi-lin Yuan,Ying-hui Wang
Author NameAffiliationE-mail
Xue-cong Li Department of Physics, Tianjin Polytechnic University, Tianjin 300387, China lixcyy@163.com 
Ning Sui Femtosecond laser laboratory, College of Physics, Jilin University, Changchun 130012, China  
Qing-hui Liu Femtosecond laser laboratory, College of Physics, Jilin University, Changchun 130012, China  
Qi-lin Yuan Femtosecond laser laboratory, College of Physics, Jilin University, Changchun 130012, China  
Ying-hui Wang Femtosecond laser laboratory, College of Physics, Jilin University, Changchun 130012, China wang@jlu.edu.cn 
Abstract:
We detect a relaxation process of excited SQ02 dye in the chlorobenzene solution and an-chor SQ02 on Al2O3 and TiO2 lm, so as to investigate the photophysical properties of pristine SQ02 in the monodisperse system, aggregation state, and the corresponding inter-facial electron transfer process. The experimental data show that the lifetime of SQ02 in the monondisperse system is ~2.0 ns, but that of SQ02 anchored on the Al2O3 lm could obviously decrease to ~21 ps. The time of electron transfer from excited SQ02 to TiO2 lm is estimated to be ~2.6 ps and the yield of electron injection is estimated to be ~89.1%, which matches the incident photon to current e ciency of dye-sensitized solar cell based on SQ02. In addition, some dyes are found to pack on the other dyes anchored on the nanocrystal lm, and their relaxation time could reach ~60 ps. They couldn't participate in the interfacial electron transfer, since they are far away from the TiO2 interface.
Key words:  SQ02 dye  Femtosecond transient absorption  Photoexcitation dynamics
FundProject:This work was supported by the National Nat-ural Science Foundation of China (No.51502109, No.21573094, No.11274142, and No.11474131), the Na-tional Found for Fostering Talents of Basic Science (No.J1103202), and the Science & Technology Devel-opment Foundation of Tianjin Higher Education Insti-tutions (No.20140904).
飞秒瞬态吸收技术研究有机/无机异质结的超快电荷转移过程
李雪璁,隋宁,刘庆辉,袁启霖,王英惠
摘要:
本文检测SQ02在氯苯溶液、Al2O3薄膜和TiO2薄膜中的弛豫过程,从而探究SQ02在单分散态和聚集态下的光物理性质以及相应过程中界面电荷转移过程.实验数据表明,单分散态下SQ02 的寿命约为2 ns,但是,在Al2O3薄膜中显著减小到21 ps.电子从激发态SQ02转移到TiO2薄膜的时间约为2.6 ps,摄入电子量约为89.1%,与基于SQ02的染料敏化太阳能电池光电效应的效率相匹配.此外,一些染料和其他染料一起嵌入纳米晶薄膜中的弛豫时间可达到60 ps.由于其远离TiO2界面,因此不参与界面电荷转移.
关键词:  染料SQ02  飞秒瞬态吸收  光激发动力学
DOI:10.1063/1674-0068/29/cjcp1512251
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