Enhancement of the efficiency and stability of planar p-i-n perovskite solar cells via incorporation of an amine-modified fullerene derivative as a cathode buffer layer |
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| Authors: | Xiaodong Liu Peng Huang Qingqing Dong Zhaowei Wang Kaicheng Zhang Hao Yu Ming Lei Yi Zhou Bo Song Yongfang Li |
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| Institution: | 1.Laboratory of Advanced Optoelectronic Materials; College of Chemistry, Chemical Engineering and Materials Science,Soochow University,Suzhou,China;2.Department of Chemistry,Zhejiang University,Hangzhou,China;3.Beijing National Laboratory for Molecular Sciences; Institute of Chemistry,Chinese Academy of Sciences,Beijing,China |
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| Abstract: | A methanol-soluble diamine-modified fullerene derivative (denoted as PCBDANI) was applied as an efficient cathode buffer layer (CBL) in planar p-i-n perovskite solar cells (pero-SCs) based on the CH3NH3PbI3–x Cl x absorber. The device with PCBDANI single CBL exhibited significantly improved performance with a power conversion efficiency (PCE) of 15.45%, which is approximately 17% higher than that of the control device without the CBL. The dramatic improvement in PCE can be attributed to the formation of an interfacial dipole at the PCBM/Al interface originating from the amine functional group and the suppression of interfacial recombination by the PCBDANI interlayer. To further improve the PCE of pero-SCs, PCBDANI/LiF double CBLs were introduced between PCBM and the top Al electrode. An impressive PCE of 15.71% was achieved, which is somewhat higher than that of the devices with LiF or PCBDANI single CBL. Besides the PCE, the long-term stability of the device with PCBDANI/LiF double CBLs is also superior to that of the device with LiF single CBL. |
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