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Triple Cathode Buffer Layers Composed of PCBM, C60, and LiF for High-Performance Planar Perovskite Solar Cells
journal contribution
posted on 2015-03-25, 00:00 authored by Xiaodong Liu, Hao Yu, Li Yan, Qingqing Dong, Qun Wan, Yi Zhou, Bo Song, Yongfang LiIn this paper, triple cathode buffer
layers (CBLs) composed of phenyl-C61-butyric acid methyl ester (PCBM),
C60, and LiF layers were introduced into the planar p–i–n
perovskite solar cells (p–i–n PSCs) with a device structure
of ITO/PEDOT:PSS/CH3NH3PbI3–xClx/CBLs/Al. For comparison,
a single CBL of PCBM and a double CBL of PCBM/LiF were also investigated
in the p–i–n PSCs. On the basis of the PCBM buffer layer,
the addition of a thin LiF layer facilitated the charge collection
process and led to the dramatic improvement of the power conversion
efficiency (PCE) of the PSCs up to 14.69% under an illumination of
AM 1.5G, 100 mW/cm2, which is to date one of the highest
efficiencies of the p–i–n PSCs. By further insertion
of a C60 layer between PCBM and LiF in the triple CBLs,
a PCE of 14.24% was obtained, and more importantly, the PCBM/C60/LiF triple CBLs are very helpful for improving the stability
of the devices and making the LiF layer less thickness-sensitive for
achieving high performances of the p–i–n PSCs.