Gong Jue, Yang Mengjin, Rebollar Dominic, Rucinski Jordan, Liveris Zachary, Zhu Kai, Xu Tao
Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL, 60115, USA.
Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, CO, 80401, USA.
Adv Mater. 2018 Jul 8:e1800973. doi: 10.1002/adma.201800973.
The chemical stabilities of hybrid perovskite materials demand further improvement toward long-term and large-scale photovoltaic applications. Herein, the enhanced chemical stability of CH NH PbI is reported by doping the divalent anion Se in the form of PbSe in precursor solutions to enhance the hydrogen-bonding-like interactions between the organic cations and the inorganic framework. As a result, in 100% humidity at 40 °C, the 10% w/w PbSe-doped CH NH PbI films exhibited >140-fold stability improvement over pristine CH NH PbI films. As the PbSe-doped CH NH PbI films maintained the perovskite structure, a top efficiency of 10.4% with 70% retention after 700 h aging in ambient air is achieved with an unencapsulated 10% w/w PbSe:MAPbI -based cell. As a bonus, the incorporated Se also effectively suppresses iodine diffusion, leading to enhanced chemical stability of the silver electrodes.
对于长期和大规模的光伏应用而言，杂化钙钛矿材料的化学稳定性仍需进一步提高。在此，通过在前驱体溶液中以PbSe的形式掺杂二价阴离子Se来增强氢键类相互作用，从而提高有机阳离子与无机骨架之间的相互作用，实现了CH₃NH₃PbI₃化学稳定性的增强。结果表明，在40℃、100%湿度条件下，10%w/w PbSe掺杂的CH₃NH₃PbI₃薄膜相对于原始CH₃NH₃PbI₃薄膜的稳定性提高了140倍以上。由于PbSe掺杂的CH₃NH₃PbI₃薄膜保持了钙钛矿结构，基于10%w/w PbSe:MAPbI₃的未封装电池在环境空气中老化700小时后，实现了10.4%的最高效率和70%的保持率。此外，掺入的Se还能有效抑制碘扩散，提高银电极的化学稳定性。
