期刊
THIN SOLID FILMS
卷 517, 期 7, 页码 2153-2157出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2008.10.092
关键词
CIGSe; Capacitance; Defect levels; Solar cells
In this work we make an attempt to clarify ambiguities and to present our present understanding of defects and defect-related phenomena affecting the capacitance characteristics of Cu(In,Ga)Se-2-based solar cells. We discuss deep defect levels derived from admittance and deep level transient spectroscopy, as well as shallow levels affecting the charge distributions by capacitance-voltage profiling. The discussion includes two types of metastable effects affecting capacitance characteristics: one induced at room temperature by light or voltage bias, and one created at low temperature by red illumination of reverse-biased junction (ROB effect). Recent theoretical achievements on negative-U properties of such intrinsic defects as selenium vacancies and In-Cu antisites are used to explain the experimental data. We show that the most prominent level in the admittance spectra is due to the response of interface states combined with contribution of deep V-se-V-Cu(-/2-) acceptor level. We attribute the ROB metastability to the relaxation of In-Cu defects upon electron capture. Finally we discuss the influence of these defects on the device efficiency. (C) 2008 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据