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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Exciton annihilation and dissociation dynamics in group II-V Cd _3P_2 quantum dots
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Exciton annihilation and dissociation dynamics in group II-V Cd _3P_2 quantum dots

机译：II-V Cd _3P_2量子点中的激子hil灭和解离动力学

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摘要

Semiconductor quantum dots (QDs) have emerged as a new class of light harvesting materials for solar energy conversion due to their unique size-dependent properties. Most recent studies have focused on II-VI group (such as CdX, X = S, Se, and Te) QDs and lead salt (such as PbS, PbSe, and PbTe) QDs. In this paper, we investigate exciton dissociation and annihilation dynamics of Cd_3P_2 QDs, a low bulk band gap (0.55 eV) II-V group material, to explore their potential application as a light harvesting component for photoreduction systems. For Cd_3P_2 QDs with 1S exciton band at 650 nm, a long-lived single exciton state with lifetime of 259 ns and a high emission quantum yield of 65% were observed. In Cd3P 2 QD-rhodamine B (RhB, an electron acceptor) complexes, excitons in QDs could be dissociated by ultrafast electron transfer to RhB (6.2 ps), and the charge separated state had a long lifetime (31 ns). Although the photoinduced electron transfer rate in QD-RhB complexes decreased with increasing QD size, electron transfer was observed in QDs with 1S exciton bands at wavelength as long as 1050 nm. Compared with CdSe and PbS, Cd_3P_2 QDs with both more strongly reducing excited states and broader absorption in the visible and near IR region can be readily achieved, making them potential photosensitizers for photodriven water or CO_2 reduction reactions.
机译：半导体量子点（QD）由于其独特的尺寸依赖性而成为一种新型的用于太阳能转换的光收集材料。最近的研究集中在II-VI组（例如CdX，X = S，Se和Te）QD和铅盐（例如PbS，PbSe和PbTe）QD。在本文中，我们研究了低体带隙（0.55 eV）II-V组材料Cd_3P_2 QD的激子解离和an灭动力学，以探讨其作为光还原系统的光收集组件的潜在应用。对于在650 nm处具有1S激子能带的Cd_3P_2 QD，观察到了长寿命的单激子态，寿命为259 ns，发射量子产率高达65％。在Cd3P 2 QD-若丹明B（RhB，一种电子受体）复合物中，QDs中的激子可以通过超快电子转移到RhB（6.2 ps）而解离，并且电荷分离态具有长寿命（31 ns）。尽管QD-RhB配合物中的光诱导电子转移速率随QD尺寸的增加而降低，但在具有1S激子能带的QD中，在长达1050 nm的波长处观察到电子转移。与CdSe和PbS相比，可以容易地实现Cd_3P_2量子点具有更强的还原激发态，并且在可见光和近红外区域具有更宽的吸收率，使其成为用于光驱动水或CO_2还原反应的潜在光敏剂。

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