Work function engineering to enhance open-circuit voltage in planar perovskite solar cells by g-C_(3)N_(4) nanosheets  

作　　者：Jian Yang Liang Chu Ruiyuan Hu Wei Liu Nanjing Liu Yuhui Ma Waqar Ahmad Xing’ao Li 

机构地区：[1]Institute of Advanced Materials&New Energy Technology Engineering Laboratory of Jiangsu Province&School of Materials Science and Engineering&School of Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China [2]Department of Mathematics and Physics,Nanjing Institute of Technology,Nanjing 211167,China [3]Department of Physics,Government College Women University,Kutchery Road,Sialkot 51310,Pakistan

出　　处：《Nano Research》2021年第7期2139-2144,共6页纳米研究（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.11804166 and 51372119);the China Postdoctoral Science Foundation(No.2018M630587).

摘　　要：Enhancement of open-circuit voltage(Voc)is an effective way to improve power conversion efficiency(PCE)of the perovskite solar cells(PSCs).Theoretically,work function engineering of TiO2 electron transport layer can reduce both the loss of Voc and current hysteresis in PSCs.In this work,two-dimensional g-C_(3)N_(4) nanosheets were adopted to modify the compact TiO2 layers in planar PSCs,which can finely tune the work function(WF)and further improve the energy level alignment at the interface to enhance the Voc and diminish the hysteresis.Meanwhile,the quality of perovskite films and charge transfer of the devices were improved by g-C_(3)N_(4) nanosheets.Therefore,the PCE of the planar PSCs was champed to 19.55%without obvious hysteresis compared with the initial 15.81%,mainly owing to the remarkable improvement of VOC from 1.01 to 1.11 V.In addition,the stability of the devices was obviously improved.The results demonstrate an effective strategy of W_(F) engineering to enhance Voc and diminish hysteresis phenomenon for improving the performance of PSCs.

关 键 词：perovskite solar cells power conversion efficiency open-circuit voltage g-C_(3)N_(4)nanosheets work function engineering 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB383[一般工业技术—材料科学与工程]