Photoconductivity of CdTe Nanocrystal-Based Thin Films: Te2- Ligands Lead To Charge Carrier Diffusion Lengths Over 2 μm

被引：21
作者：
Crisp, Ryan W. [1 ,2 ]
Callahan, Rebecca [1 ,3 ]
Reid, Obadiah G. [4 ]
Dolzhnikov, Dmitriy S. [5 ]
Talapin, Dmitri V.
Rumbles, Garry [1 ]
Luther, Joseph M. [1 ]
Kopidakis, Nikos [1 ]
机构：
[1] Natl Renewable Energy Lab, Golden, CO 80401 USA
[2] Colorado Sch Mines, Dept Phys, Golden, CO 80401 USA
[3] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA
[4] Univ Colorado, Renewable & Sustainable Energy Inst, Boulder, CO 80309 USA
[5] Univ Chicago, Dept Chem, Chicago, IL 60637 USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2015年 / 6卷 / 23期
关键词：
QUANTUM-DOT SOLIDS; SOLAR-CELLS; COLLOIDAL NANOCRYSTALS; ELECTRICAL-PROPERTIES; SURFACE LIGANDS; CDSE; TRANSPORT; LAYER; PHOTOVOLTAICS; PERFORMANCE;
D O I：
10.1021/acs.jpclett.5b02252
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：
We report on photoconductivity of films of CdTe nanocrystals (NCs) using time-resolved microwave photoconductivity (TRMC). Spherical and tetrapodal CdTe NCs with tunable size-dependent properties are studied as a function of surface ligand (including inorganic molecular chalcogenide species) and annealing temperature. Relatively high carrier mobility is measured for films of sintered tetrapod NCs (4 cm(2)/(V s)). Our TRMC findings show that Te2- capped CdTe NCs show a marked improvement in carrier mobility (11 cm(2)/(V s)), indicating that NC surface termination can be altered to play a crucial role in charge-carrier mobility even after the NC solids are sintered into bulk films.
引用
收藏
页码：4815 / 4821
页数：7
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