Photoconductivity of CdTe Nanocrystal-Based Thin Films: Te2鈥?Ligands Lead To Charge Carrier Diffusion Lengths Over 2 渭m

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• 作者：Ryan W. Crisp ; Rebecca Callahan ; Obadiah G. Reid ; Dmitriy S. Dolzhnikov ; Dmitri V. Talapin ; Garry Rumbles ; Joseph M. Luther ; Nikos Kopidakis
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：December 3, 2015
• 年：2015
• 卷：6
• 期：23
• 页码：4815-4821
• 全文大小：425K
• ISSN：1948-7185

文摘

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 cm²/(V s)). Our TRMC findings show that Te^{2鈥?/sup> capped CdTe NCs show a marked improvement in carrier mobility (11 cm2/(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.}