Boosting efficiency of planar heterojunction perovskite solar cells by a low temperature TiCl_(4) treatment  

作　　者：Enqi Wang Peng Chen Xingtian Yin Bowen Gao Wenxiu Que 

机构地区：[1]Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education International Center for Dielectric Research Shaanxi Engineering Research Center of Advanced Energy Materials and Devices School of Electronic&Information Engineering Xi’an Jiaotong University Xi’an 710049,Shanxi,P.R.China [2]School of Machinery and Architectural Engineering Taishan University,Taian 271021,P.R.China

出　　处：《Journal of Advanced Dielectrics》2018年第2期31-37,共7页先进电介质学报（英文）

基　　金：funded by China Postdoctoral Science Foundation under Grant No.2017T100751;Natural Science Foundation of Shandong Province under Grant No.ZR2017MF007;Shandong Science and Technology Plan Project of Higher Education Institutions under Grant No.J16LA02 and the 111 Project of China(B14040)。

摘　　要：It is well known that electron transport layer(ETL)plays an indispensable role in the planar heterojunction perovskite solar cells(PSCs).TiO_(2) is widely used as an ETL material due to its excellent transport properties,however,the presence of defects in the TiO_(2) layer diminishes the power conversion efficiency(PCE)of the devices.Herein,we introduce a method of low-temperature TiCl_(4) treatment to deposit a TiOx layer on the surface of TiO_(2) film,which can effectively passivate trap states at the TiO_(2) surface.Moreover,the treating process is optimized to be 30 min using a 40 mM TiCl_(4) aqueous solution.Benefiting from this,we obtain the champion device with the highest PCE of 18.47%,which is mainly due to the reduction of surface defects and the deposition of the well-crystallized perovskite films.Besides,the modified PSCs exhibit an average PCE of 17.59%,which is much better than the control devices.

关 键 词：Perovskite solar cells TiO_(2) TiCl_(4) surface modification 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]