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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Face-Dependent Electron Transfer in CdSe Nanoplatelet-Methyl Viologen Complexes
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Face-Dependent Electron Transfer in CdSe Nanoplatelet-Methyl Viologen Complexes

机译:CdSe纳米血小板-甲基紫精复合物中的面相关电子转移

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Charge separation in colloidal semiconductor nanocrystals (CSNCs) is one of the key processes for the development of highly efficient solar cells. Several types of CSNCs have been recently synthesized with controlled quantum confinement dimensionality such as quantum dots (QDs), nanorods (NRs), and nanoplatelets (NPLs). However, previous studies on the carrier extraction dynamics from CSNCs have focused on QDs and NRs. Here, we analyzed the electron transfer process from colloidal CdSe NPLs to methyl viologen (MV2+, electron acceptor) using luminescence decay measurements and femtosecond pump probe spectroscopy. We examined the dependence of the electron transfer dynamics on the lateral size of CdSe NPLs and found that the rate of electron transfer from CdSe NPLs to MV2+ depends on the NPL face where MV2+ adsorbs. In addition, we analyzed the growth kinetics and initial bleach amplitude at the band-edge bleach of CdSe NPLs and CdSe NPL-MV2+ complexes and found that, in contrast with the behavior of CdSe QD-MV2+ and NR-MV2+ complexes, hot electron transfer does not occur. This result is a consequence of fast intraband relaxation in CdSe NPLs and the relatively slow electron transfer process.
机译:胶体半导体纳米晶体(CSNC)中的电荷分离是开发高效太阳能电池的关键过程之一。最近已经合成了几种类型的CSNC,它们具有受控的量子限制维数,例如量子点(QD),纳米棒(NR)和纳米片(NPL)。但是,以前关于CSNC载波提取动力学的研究都集中在QD和NR上。在这里,我们使用发光衰减测量和飞秒泵浦光谱技术分析了从胶态CdSe NPLs到甲基紫精(MV2 +,电子受体)的电子转移过程。我们检查了电子传输动力学对CdSe NPLs横向尺寸的依赖性,发现电子从CdSe NPLs迁移到MV2 +的速率取决于MV2 +吸附的NPL面。此外,我们分析了CdSe NPL和CdSe NPL-MV2 +复合物的带边漂白的生长动力学和初始漂白幅度,发现与CdSe QD-MV2 +和NR-MV2 +复合物的行为相反,热电子转移不会发生。此结果是CdSe NPL中带内快速弛豫和相对缓慢的电子转移过程的结果。

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