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Triple Cathode Buffer Layers Composed of PCBM, C₆₀, and LiF for High-Performance Planar Perovskite Solar Cells

Xiaodong Liu^†,   Hao Yu^†,   Li Yan^†,   Qingqing Dong^†,   Qun Wan^†,   Yi Zhou^*†(周祎),   Bo Song^*†(宋波)  and   Yongfang Li^*†‡(李永舫)  

^† Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, China

^‡ Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

ACS Appl. Mater. Interfaces 2015, 7, 6230–6237

In 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/CH₃NH₃PbI_3–xCl_x/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.

链接：

//pubs.acs.org/doi/abs/10.1021/acsami.5b00468