Charge transfer in hybrid organic-inorganic PbS nanocrystal systems

被引：11
作者：
Nordin, Muhammad N. [1 ]
Bourdakos, Konstantinos N. [2 ]
Curry, Richard J. [1 ]
机构：
[1] Univ Surrey, Adv Technol Inst, Guildford GU2 7XH, Surrey, England
[2] Univ Durham, Dept Phys, Durham DH1 3LE, England
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2010年 / 12卷 / 27期
基金：
英国工程与自然科学研究理事会;
关键词：
LIGHT-EMITTING-DIODES; QUANTUM DOTS; SEMICONDUCTOR NANOCRYSTALS; COMPOSITES; EMISSION; ELECTROLUMINESCENCE; PHOTOLUMINESCENCE; PHOTOCONDUCTIVITY; SPECTRA; ENERGY;
D O I：
10.1039/c003179h
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Charge transfer interactions between PbS nanocrystals (NCs) and tetrathiafulvalene (TTF) and 7,7,8,8-tetracyanoquinodimethane (TCNQ) are studied using optical spectroscopy. Selective quenching of PbS NC photoluminescence (PL) by TTF is observed and related to the relative alignment of the highest occupied molecular orbital (HOMO) of TTF and the PbS NC 1s(h) energy level. TCNQ is also found to quench PbS NC PL irrespective of the NC bandgap. A ground-state charge transfer mechanism between PbS and TCNQ is proposed to account for the observed quenching indirectly supported by observed changes in the absorption spectra of PbS-TTF and PbS-TCNQ solutions. Additionally, a second emission band in the visible spectral region (similar to 675 nm) is found upon excitation of PbS-TCNQ solutions. These results are of interest for the future design of charge-transfer systems for use in hybrid organic-inorganic systems.
引用
收藏
页码：7371 / 7377
页数：7
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