Qiuju Liu,Yang Liu,Hu Liu,Qingyong Tian,Bin Fan,Hua Bai
Room-temperature-processed (RTP) electron-transport layer (ETL) is a prerequisite for fabricating fully RTP perovskite solar cells (PSCs). Herein, an RTP-Zn 2 SnO 4 (ZSO) ETL is deposited for achieving RTP-PSCs by magnetron sputtering using ZnO and SnO 2 targets. The ZSO ETL exhibits great electrical properties, better band alignment, and yields increased grain size of the perovskite grown on it, thus facilitating electron extraction from the perovskite layer to the ETL. As a result, a champion power conversion efficiency of 21.06% is achieved in the ZSO-based device, which is the highest value for RTP-PSCs. The ZSO-based PSCs also exhibit high device stability. Moreover, the efficiency of a large-area perovskite module based on ZSO ETL reaches 17.79%.
The electron transport layer (ETL) plays a crucial role on the electron injection and extraction, resulting in balanced charge transporting and reducing the interfacial energy barrier. The interface compatibility and electrical contact via employing appropriate buffer layer at the surface of hydrophobic organic active layer and hydrophilic inorganic electrode are also essential for charge collections. Herein, an ether chain functionalized fullerene derivatives [6,6]-phenyl-C 61 -butyricacid-(3,5-bis(2-(2-ethoxyethoxy)-ethoxy)-phenyl)-methyl ester (C 60 -2EPM) was developed to modify zinc oxide (ZnO) in inverted structure organic solar cells (OSCs). The composited ZnO/C 60 -2EPM interface layer can help to overcome the low interface compatibility between ZnO and organic active layer. By introducing the C 60 -2EPM layer, the composited fullerene derivatives tune energy alignment and accelerated the electronic transfer, leading to increased photocurrent and power conversion efficiency (PCE) in the inverted OSCs. The PCE based on PTB7-Th: PC 71 BM was enhance from 8.11% on bare ZnO to 8.38% and 8.65% with increasing concentrations of 2.0 and 4.0 mg/mL, respectively. The fullerene derivatives C 60 -2EPM was also used as a third compound in P3HT:PC 61 BM blend to form ternary system, the devices with addition of C 60 -2EPM exhibited better values than the control device.
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