Journal
SCIENCE CHINA-CHEMISTRY
Volume 60, Issue 1, Pages 136-143Publisher
SCIENCE PRESS
DOI: 10.1007/s11426-016-0085-y
Keywords
planar p-i-n perovskite solar cells; cathode buffer layers; amine-modified fullerene derivative; PCBDANI/LiF double CBLs; stability
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Funding
- National Natural Science Foundation of China [21204054, 51303118, 91333204]
- Natural Science Foundation of Jiangsu Province [BK20130289]
- Ph.D. Programs Foundation of Ministry of Education of China [20133201120008]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Scientific Research Foundation for Returned Scholars
- Ministry of Education of China
- Beijing National Laboratory for Molecular Sciences
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials
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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.
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