Modulation of Defects in Semiconductors by Facile and Controllable Reduction: The Case of p-type CuCrO2 Nanoparticles

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• 作者：Tengfei Jiang ; Xueyan Li ; Martine Bujoli-Doeuff ; Eric Gautron ; Laurent Cario ; Stéphane Jobic ; Romain Gautier
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：August 1, 2016
• 年：2016
• 卷：55
• 期：15
• 页码：7729-7733
• 全文大小：377K
• 年卷期：0
• ISSN：1520-510X

文摘

Optical and electrical characteristics of solid materials are well-known to be intimately related to the presence of intrinsic or extrinsic defects. Hence, the control of defects in semiconductors is of great importance to achieve specific properties, for example, transparency and conductivity. Herein, a facile and controllable reduction method for modulating the defects is proposed and used for the case of p-type delafossite CuCrO₂ nanoparticles. The optical absorption in the infrared region of the CuCrO₂ material can then be fine-tuned via the continuous reduction of nonstoichiometric Cu^II, naturally stabilized in small amounts. This reduction modifies the concentration of positive charge carriers in the material, and thus the conductive and reflective properties, as well as the flat band potential. Indeed, this controllable reduction methodology provides a novel strategy to modulate the (opto-) electronic characteristics of semiconductors.