Enhanced performance of planar perovskite solar cells using TiO2/SnO2 and TiO2/WO3 bilayer structures: Roles of the interfacial layers

被引:77
作者
Otoufi, Mozhgan Kazemzadeh [1 ,2 ]
Ranjbar, Mehdi [1 ]
Kermanpur, Ahmad [3 ]
Taghavinia, Nima [4 ,5 ]
Minbashi, Mehran [6 ]
Forouzandeh, Mozhdeh [6 ]
Ebadi, Firouzeh [5 ]
机构
[1] Isfahan Univ Technol, Dept Phys, Esfahan 8415683111, Iran
[2] Isfahan Univ Technol, Pardis Coll, Phys Grp, Esfahan 8415683111, Iran
[3] Isfahan Univ Technol, Dept Mat Engn, Esfahan 8415683111, Iran
[4] Sharif Univ Technol, Dept Phys, Tehran 111559161, Iran
[5] Sharif Univ Technol, Inst Nanosci & Nanotechnol, Tehran 1458889694, Iran
[6] Tarbiat Modares Univ, Dept Phys, Tehran 14115175, Iran
关键词
Perovskitesolarcells; Electrontransportbilayer; TiO2; WO3; SnO2; Sputtering; ELECTRON-TRANSPORT LAYER; DIELECTRIC-PROPERTIES; COMPACT LAYER; HYSTERESIS; EFFICIENCY;
D O I
10.1016/j.solener.2020.08.035
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
In planar perovskite solar cells (PSCs), engineering the extraction and recombination of electron-hole pairs by modification of the electron transport layer (ETL)/perovskite interface is very vital for obtaining high performance. The main idea here is to improve properties of the TiO2/perovskite interface by inserting an ultra-thin layer (UTL) of WO3 or SnO2 with the thickness of less than 10 nm by RF magnetron sputtering method. The structural and electrical characteristics of the samples were tested by XRD, AFM, FE-SEM, Mott-Schottky analysis, UV-Vis spectroscopy, J-V characterization and electrochemical impedance spectroscopy (EIS). It was found that the bilayer structured ETLs exhibit advantages of high electron extraction and low interfacial recombination together mainly based on a more effective energy level alignment. The best performance here belongs to the cell with TiO2/SnO2 bilayer by which an improved efficiency exceeding 12% was achieved for the planar PSCs. The role of SnO2 and WO3 UTLs was also modeled using SCAPS-1D software. This simulation supported the experimental results and was used to interpret the photovoltaic behaviors of the fabricated devices based on defect characteristics. The present work proposes a simple and promising method to make photovoltaic devices with desirable charge transport and recombination properties.
引用
收藏
页码:697 / 707
页数:11
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