Highly efficient flexible perovskite solar cells with vacuum-assisted low-temperature annealed SnO2 electron transport layer  

作　　者：Xiaoguo Li Zejiao Shi Fatemeh Behrouznejad Mohammad Hatamvand Xin Zhang Yaxin Wang Fengcai Liu Haoliang Wang Kai Liu Hongliang Dong Farhan Mudasar Jiao Wang Anran Yu Yiqiang Zhan 

机构地区：[1]Center for Micro Nano Systems,School of Information Science and Technology(SIST),Fudan University,Shanghai 200433,China [2]Academy for Engineering&Technology,Fudan University,Shanghai 200433,China [3]Center for High Pressure Science and Technology Advanced Research,Pudong,Shanghai 201203,China

出　　处：《Journal of Energy Chemistry》2022年第4期1-7,共7页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(61774046)。

摘　　要：The demand for lightweight, flexible, and high-performance portable power sources urgently requires high-efficiency and stable flexible solar cells. In the case of perovskite solar cells(PSCs), most of the common electron transport layer(ETL) needs to be annealed for improving the optoelectronic properties,while conventional flexible substrates could barely stand the high temperature. Herein, a vacuumassisted annealing SnO_(2) ETL at low temperature(100℃) is utilized in flexible PSCs and achieved high efficiency of 20.14%. Meanwhile, the open-circuit voltage(V_(oc)) increases from 1.07 V to 1.14 V. The flexible PSCs also show robust bending stability with 86.8% of the initial efficiency is retained after 1000 bending cycles at a bending radius of 5 mm. X-ray photoelectron spectroscopy(XPS), atomic force microscopy(AFM), and contact angle measurements show that the density of oxygen vacancies, the surface roughness of the SnO_(2) layer, and film hydrophobicity are significantly increased, respectively. These improvements could be due to the oxygen-deficient environment in a vacuum chamber, and the rapid evaporation of solvents. The proposed vacuum-assisted low-temperature annealing method not only improves the efficiency of flexible PSCs but is also compatible and promising in the large-scale commercialization of flexible PSCs.

关 键 词：Flexible perovskite solar cells VACUUM-ASSISTED Electron transport layer Trap-assisted recombination 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TQ134.32[化学工程—无机化工]