Energy band alignment at Cu2O/ZnO heterojunctions characterized by in situ x-ray photoelectron spectroscopy

作     者：Yan Zhao Hong-Bu Yin Ya-Jun Fu Xue-Min Wang Wei-Dong Wu 赵妍;尹泓卜;符亚军;王雪敏;吴卫东

作者机构：Science and Technology on Plasma Physics Laboratory Research Center of Laser Fusion China Academy of Engineering Physics 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2019年第28卷第8期

页      面：311-315页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11404302) the Laser Fusion Research Center Funds for Young Talents,China(Grant No.RCFPD1-2017-9) 

主　　题：Cu2O ZnO x-ray photoelectron spectroscopy laser-molecular beam epitaxy 

摘      要：With the increasing interest in Cu2O-based devices for photovoltaic applications,the energy band alignment at the Cu2O/ZnO heterojunction has received more and more *** this work,a high-quality Cu2O/ZnO heterojunction is fabricated on a c-Al2 O3 substrate by laser-molecular beam epitaxy,and the energy band alignment is determined by x-ray photoelectron *** valence band of ZnO is found to be 1.97 eV below that of Cu2O.A type-II band alignment exists at the Cu2O/ZnO heterojunction with a resulting conduction band offset of 0.77 eV,which is especially favorable for enhancing the efficiency of Cu2O/ZnO solar cells.