Regulating Surface Termination for Efficient Inverted Perovskite Solar Cells with Greater Than 23% Efficiency

• DOI: 10.1021/jacs.0c09845
• Publication Date: 2020-11-16T05:54:36Z
• Authors: Fengzhu Li; Xiang Deng; Feng Qi; Zhen Li; Danjun Liu; Dong Shen; Minchao Qin; Shengfan Wu; Francis Lin; Sei-Hum Jang; Jie Zhang; Xinhui Lu; Dangyuan Lei; Chun-Sing Lee; Zonglong Zhu; Alex K.-Y. Jen
• Keywords: Passivation

Passivating surface and bulk defects of perovskite films has been proven to be an effective way minimize nonradiative recombination losses in solar cells (PVSCs). The lattice interference perturbation atomic periodicity at the surfaces often significantly affect material properties device efficiencies. By tailoring terminal groups on modifying chemical environment, can reduced enhance photovoltaic performance stability derived PVSCs. Here, we report a rationally designed bifunctional molecule, piperazinium iodide (PI), containing both R2NH R2NH2+ same six-membered ring, behaving as electron donor acceptor react with different surface-terminating ends films. resulting after defect passivation show released residual stress, suppressed loss, more n-type characteristics for sufficient energy transfer. Consequently, charge is result high open-circuit voltage (VOC) 1.17 V VOC loss 0.33 V. A very power conversion efficiency (PCE) 23.37% (with 22.75% certified) could achieved, which highest value reported inverted Our work reveals using molecules simultaneously stability.