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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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.
Keywordsplanar p-i-n perovskite solar cells cathode buffer layers amine-modified fullerene derivative PCBDANI/LiF double CBLs stability
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This work was supported by the National Natural Science Foundation of China (21204054, 51303118, 91333204), the Natural Science Foundation of Jiangsu Province (BK20130289), the Ph.D. Programs Foundation of Ministry of Education of China (20133201120008), the Priority Academic Program Development of Jiangsu Higher Education Institutions, the Scientific Research Foundation for Returned Scholars, Ministry of Education of China, and Beijing National Laboratory for Molecular Sciences, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials.
- 26.Wang Y, Bai S, Cheng L, Wang N, Wang J, Gao F, Huang W. Adv Mater, 2015, 201504260Google Scholar