Jiang Tengfei, Li Xueyan, Bujoli-Doeuff Martine, Gautron Eric, Cario Laurent, Jobic Stéphane, Gautier Romain
Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS , 2 rue de la Houssinière, BP 32229, 44322 Nantes, Cedex 03, France.
Inorg Chem. 2016 Aug 1;55(15):7729-33. doi: 10.1021/acs.inorgchem.6b01169. Epub 2016 Jul 13.
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.
众所周知，固体材料的光学和电学特性与本征或非本征缺陷的存在密切相关。因此，控制半导体中的缺陷对于实现特定性能（例如透明度和导电性）非常重要。在此，提出了一种简便且可控的用于调节缺陷的还原方法，并将其应用于p型铜铬矿CuCrO2纳米颗粒的情况。通过连续还原少量自然稳定存在的非化学计量Cu(II)，可以对CuCrO2材料红外区域的光吸收进行微调。这种还原改变了材料中正电荷载流子的浓度，进而改变了导电和反射特性以及平带电位。实际上，这种可控还原方法为调节半导体的（光）电子特性提供了一种新策略。
