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Effect of Bilayer SnO2 Electron Transport Layer on the Interfacial Charge Transport in Perovskite Solar Cells
Author NameAffiliationE-mail
LUO Yuan School of Metallurgy and Environment, Central South University, Changsha 410083, China
Hunan Key Laboratory of Nonferrous Metal Resources Recycling, Changsha 410083, China
National&Regional Joint Engineering Research Center of Nonferrous Metal Resources Recycling, Changsha 410083, China 		 
ZHANG Gui-Lin School of Metallurgy and Environment, Central South University, Changsha 410083, China
Hunan Key Laboratory of Nonferrous Metal Resources Recycling, Changsha 410083, China
National&Regional Joint Engineering Research Center of Nonferrous Metal Resources Recycling, Changsha 410083, China 		 
MA Shu-Peng School of Metallurgy and Environment, Central South University, Changsha 410083, China
Hunan Key Laboratory of Nonferrous Metal Resources Recycling, Changsha 410083, China
National&Regional Joint Engineering Research Center of Nonferrous Metal Resources Recycling, Changsha 410083, China 		 
ZHU Cong-Tan School of Metallurgy and Environment, Central South University, Changsha 410083, China
Hunan Key Laboratory of Nonferrous Metal Resources Recycling, Changsha 410083, China
National&Regional Joint Engineering Research Center of Nonferrous Metal Resources Recycling, Changsha 410083, China 		 
CHEN Tian School of Metallurgy and Environment, Central South University, Changsha 410083, China
Hunan Key Laboratory of Nonferrous Metal Resources Recycling, Changsha 410083, China
National&Regional Joint Engineering Research Center of Nonferrous Metal Resources Recycling, Changsha 410083, China 		 
ZHANG Lin School of Metallurgy and Environment, Central South University, Changsha 410083, China
Hunan Key Laboratory of Nonferrous Metal Resources Recycling, Changsha 410083, China
National&Regional Joint Engineering Research Center of Nonferrous Metal Resources Recycling, Changsha 410083, China 		 
ZHU Liu Guangdong Provincial Enterprise Key Laboratory of High Performance Thin Film Solar Materials, Qingyuan, Guangdong 511517, China
First Materials Co., Ltd., Qingyuan, Guangdong 511517, China 		 
GUO Xue-Yi School of Metallurgy and Environment, Central South University, Changsha 410083, China
Hunan Key Laboratory of Nonferrous Metal Resources Recycling, Changsha 410083, China
National&Regional Joint Engineering Research Center of Nonferrous Metal Resources Recycling, Changsha 410083, China 		 
YANG Ying School of Metallurgy and Environment, Central South University, Changsha 410083, China
Hunan Key Laboratory of Nonferrous Metal Resources Recycling, Changsha 410083, China
National&Regional Joint Engineering Research Center of Nonferrous Metal Resources Recycling, Changsha 410083, China 		muyicaoyang@csu.edu.cn 
Abstract: SnO2 has the advantages of the wide bandgap, high optical transparency, high electron mobility, excellent UV stability, and lower preparation temperature. It is widely used in high-efficiency and stable perovskite solar cells (PSCs). However, the surface defects of SnO2 can cause serious hysteresis and other adverse effects. In order to improve the interfacial charge transport characteristics and hysteresis of perovskite solar cells based on the SnO2 electron transport layer. Four different types of SnO2 electron transport layers were prepared as electron transport layers (ETLs) for PSCs using low-temperature solution processing technology. SnCl4·5H2O (Cl4-SnO2), SnCl2·2H2O (Cl2-SnO2), and SnO2 nanoparticle (NP-SnO2) were used to form the bilayer ETL structure with SnO2 colloidal (Col-SnO2). The effects of different SnO2 bilayer ETLs on the photoelectric performance and hysteresis of the device were systematically studied. Through analysis of scanning electron microscopy (SEM), X-ray diffraction (XRD), steady-state photoluminescence spectrum (PL), electrochemical impedance (EIS), and stability test, it can be confirmed that the surface of Cl 4-SnO2/Col-SnO2 and Cl2-SnO2/Col-SnO2 films was smooth and compact with good coverage; and inserting a Cl2-SnO2 layer under the Col-SnO2 layer can form better interface contact and fewer interfacial defects, which is beneficial to reduce the interfacial resistance and charge recombination, and exhibits more excellent electron extraction and transport characteristics. However, the nanostructure composed of the NP-SnO2 layer and the Col-SnO2 layer is not conducive to the growth of perovskite crystals, and the incompatible interface between the two causes serious charge recombination, which will affect the charge transfer. Compared with the device based on the Col-SnO2 single ETL device (14.16%), the device based on the Cl2-SnO2/Col-SnO2 bilayer structure obtained a photoelectric conversion efficiency of 15.01%, and the photoelectric conversion efficiency of the forward scan was increased by about 23.3%, short circuit current density (Jsc) and fill factor (FF) were improved, the hysteresis was obviously suppressed and showed better stability.
Keywords: bilayer electron transport layer  perovskite solar cells  tin oxide  interface adjustment  hysteresis  stability
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LUO Yuan,ZHANG Gui-Lin,MA Shu-Peng,ZHU Cong-Tan,CHEN Tian,ZHANG Lin,ZHU Liu,GUO Xue-Yi,YANG Ying.Effect of Bilayer SnO2 Electron Transport Layer on the Interfacial Charge Transport in Perovskite Solar Cells[J].Chinese Journal of Inorganic Chemistry,2022,38(5):850-860.
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Chinese Journal of Inorganic Chemistry