Investigation of the effects of MoO_3 buffer layer on charge carrier injection and extraction by capacitance–voltage measurement  

作　　者：Wei Gong Zheng Xu Suling Zhao Xiaodong Liu Xing Fan Qianqian Yang Chao Kong 

机构地区：[1]Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University [2]Institute of Optoelectronics Technology, Beijing Jiaotong University

出　　处：《Chinese Science Bulletin》2014年第8期747-753,共7页

基　　金：supported by the National Basic Research Program of China(2010CB327704);the Research Fund for the Doctoral Program of Higher Education(20130009130001);the National Natural Science Foundation of China(51272022);the Research Fund for the Doctoral Program of Higher Education(20120009130005);the Program for New Century Excellent Talents in University of Ministry of Education of China(NCET-10-0220);the Fundamental Research Funds for the Central Universities(2012JBZ001)

摘　　要：The effects of MoO3thin buffer layer on charge carrier injection and extraction in inverted configuration ITO/ZnO/MEH-PPV(poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene))/MoO3(0,5 nm)/Ag hybrid solar cells are investigated by capacitance–voltage measurement under dark and light illumination conditions.The efficiency of charge carrier injection and extraction is enhanced by inserting 5 nm MoO3thin layer,resulting in better device performances.Charge carrier transport of the whole device is improved and the interface energy barrier is reduced by inserting 5 nm MoO3thin buffer layer.The device fill factor is increased from 54.1%to 57.5%after modifying 5 nm MoO3.Simulations and experimental results consistently show that in the forward voltage under dark,the device with the 5 nm MoO3thin layer modification generates larger value of capacitance than the device without MoO3layer.While under illumination,the device with the 5 nm MoO3layer generates smaller value of capacitance than the device without the 5 nm MoO3layer in the bias region of reverse and before the peak position of maximum capacitance(VCmax).The underlying mechanism of the MoO3anode buffer layer on device current density–voltage characteristics is discussed.The effects of MoO3 thin buffer layer on charge cartier injection and extraction in inverted configuration ITO/ZnO/MEH-PPV （poly（2-methoxy-5-（2-ethylhexyl- oxy）-1,4-phenylenevinylene））/MoO3 （0, 5 nm）/Ag hybrid solar cells are investigated by capacitance-voltage mea- surement under dark and light illumination conditions. The efficiency of charge carrier injection and extraction is enhanced by inserting 5 nm MoO3 thin layer, resulting in better device performances. Charge carrier transport of the whole device is improved and the interface energy barrier is reduced by inserting 5 nm MoO3 thin buffer layer. The device fill factor is increased from 54.1% to 57.5 % after modifying 5 nm MoO3. Simulations and experimental results consistently show that in the forward voltage under dark, the device with the 5 nm MoO3 thin layer modifi- cation generates larger value of capacitance than the device without MoO3 layer. While under illumination, the device with the 5 nm MoO3 layer generates smaller value of capacitance than the device without the 5 nm MoO3 layer in the bias region of reverse and before the peak position of maximum capacitance （Vcmax）. The underlying mechanism of the MoO3 anode buffer layer on device current density- voltage characteristics is discussed.

关 键 词：三氧化钼 载流子注入 电压测量 电容比 缓冲层 提取 MEH-PPV 光照条件 

分 类 号：TM914.4[电气工程—电力电子与电力传动]