Xue-cong Li, Ning Sui, Qing-hui Liu, Qi-lin Yuan, Ying-hui Wang. Investigation of Ultrafast Electronic Transfer Process on Organic/Inorganic Heterojunction by Femtosecond Transient Absorption[J]. Chinese Journal of Chemical Physics , 2016, 29(3): 389-394. doi: 10.1063/1674-0068/29/cjcp1512251
Citation: Xue-cong Li, Ning Sui, Qing-hui Liu, Qi-lin Yuan, Ying-hui Wang. Investigation of Ultrafast Electronic Transfer Process on Organic/Inorganic Heterojunction by Femtosecond Transient Absorption[J]. Chinese Journal of Chemical Physics , 2016, 29(3): 389-394. doi: 10.1063/1674-0068/29/cjcp1512251

Investigation of Ultrafast Electronic Transfer Process on Organic/Inorganic Heterojunction by Femtosecond Transient Absorption

doi: 10.1063/1674-0068/29/cjcp1512251
  • Received Date: 2015-12-08
  • Rev Recd Date: 2016-01-25
  • 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.
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Investigation of Ultrafast Electronic Transfer Process on Organic/Inorganic Heterojunction by Femtosecond Transient Absorption

doi: 10.1063/1674-0068/29/cjcp1512251

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.

Xue-cong Li, Ning Sui, Qing-hui Liu, Qi-lin Yuan, Ying-hui Wang. Investigation of Ultrafast Electronic Transfer Process on Organic/Inorganic Heterojunction by Femtosecond Transient Absorption[J]. Chinese Journal of Chemical Physics , 2016, 29(3): 389-394. doi: 10.1063/1674-0068/29/cjcp1512251
Citation: Xue-cong Li, Ning Sui, Qing-hui Liu, Qi-lin Yuan, Ying-hui Wang. Investigation of Ultrafast Electronic Transfer Process on Organic/Inorganic Heterojunction by Femtosecond Transient Absorption[J]. Chinese Journal of Chemical Physics , 2016, 29(3): 389-394. doi: 10.1063/1674-0068/29/cjcp1512251
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