Isomer-pure bis-PCBM assisted crystal engineering of perovskite solar cells showing excellent efficiency and stability
MetadataShow full item record
The fullerene derivative (α-bis-PCBM) was purified from an as-produced bis-phenyl-C61-butyric acid methyl ester (bis-PCBM) isomer mixture by preparative peak-recycling high performance liquid chromatography (HPLC) and employed as a templating agent for solution processing of metal halide perovskite films via an antisolvent method. The resulting α-bis-PCBM-containing perovskite solar cells (PSCs) achieve better stability, efficiency, and reproducibility when compared with analogous cells containing PCBM. α-bis-PCBM fills the vacancies and grain boundaries of the perovskite film, enhancing the crystallization of perovskites and addressing the issue of slow electron extraction. In addition, α-bis-PCBM resists the ingression of moisture and passivates voids or pinholes generated in the hole-transporting layer. As a result, we obtain a power conversion efficiency (PCE) of 20.8 % compared with 19.9 % by PCBM, accompanied by excellent stability under heat and simulated sunlight. The PCE of unsealed devcies dropped by less than 10% in ambient air (40% RH) after 44 days at 65℃ and by 4% after 600 h under continuous full sun illuminationand maximum power point tracking respectively.
AuthorsZhang, F; Shi, W; Luo, J; Pellet, N; Yi, C; Li, X; Zhao, X; DENNIS, TJS; Li, X; Wang, S; Xiao, Y; Zakeeruddin, MS; Bi, D; Grätzel, M
- College Publications