Annealing-Free Cr2O3 Electron-Selective Layer for Efficient Hybrid Perovskite Solar Cells

作者：Dong, Jia; Wu, Jihuai^*; Jia, Jinbiao; He, Xin; Lan, Zhang; Fan, Leqing; Lin, Jianming; Huang, Miaoliang

来源：Chemsuschem, 2018, 11(3): 619-628.

DOI：10.1002/cssc.201701864

• chromium
• energy conversion
• layered compounds
• perovskites
• solar cells

The electron-selective layer (ESL) plays a pivotal role in the performance of perovskite solar cells (PSCs). In this study, amorphous dispersible chromium oxide (Cr2O3) nanosheets are synthesized by a facile solvothermal reaction, and a Cr2O3 ESL is prepared by spin-coating Cr2O3 ink on fluorine-doped tin oxide substrates without need for further annealing. By using Cr2O3 as the electron-selective layer and Cs-0.05(MA(0.17)FA(0.83))(0.95)Pb(I0.83Br0.17)(3) as the light-absorption layer, a planar hybrid perovskite solar cell is fabricated. The spin-coating speed is optimized, the structure and morphology of samples are observed, the photoelectrical properties of ESLs are characterized, and the photovoltaic behaviors of devices are measured. Results show that the as-prepared Cr2O3 layer has high optical transmittance and superb electron extraction and carrier transport property. The planar hybrid PSC based on the optimized Cr2O3 ESL achieves a power conversion efficiency of 16.23%, which is comparable to devices based on a conventional high-temperature-calcined TiO2 ESL. These results demonstrate a low-cost and facile route to highly effective perovskite solar cells.

• 出版日期2018-2-9
• 单位华侨大学