Tailored Phase Conversion under Conjugated Polymer Enables Thermally Stable Perovskite Solar Cells with Efficiency Exceeding 21%

• DOI: 10.1021/jacs.8b10520
• Publication Date: 2018-11-19T06:16:46Z
• Authors: Lei Meng; Chenkai Sun; Rui Wang; Wenchao Huang; Zipeng Zhao; Pengyu Sun; Tianyi Huang; Jingjing Xue; Jin-Wook Lee; Chenhui Zhu; Yu Huang; Yongfang Li; Yang Yang
• Keywords: Thermal Stability; Perovskite solar cell

The precise control of stoichiometric balance and ionic defects on the surface solution-processed perovskite is critical to performance stability solar cells (pero-SCs). Here, we introduce a low-cost stable conjugated donor polymer (PTQ10) as interfacial layer in planar n–i–p structured pero-SCs. was applied intermediate phase before thermal annealing. This treatment significantly reduced loss organic cation during Importantly, kinetics conversion influenced, crystal showed more preferential orientation. Moreover, proved be an effective hole extraction due proper energy alignment with perovskite. Finally, champion power efficiency pero-SCs achieved at 21.2% high fill factor 81.6%. devices also great ambient stability. work presents facile way achieve high-performance