Journal
NANO RESEARCH
Volume 8, Issue 4, Pages 1116-1127Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-014-0592-y
Keywords
perovskite solar cells; organolead halide; hole-transporting materials; interfacial recombination
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Funding
- National Basic Research Program of China [2012CB932903, 2012CB932904]
- Beijing Science and Technology Committee [Z131100006013003]
- National Natural Science Foundation of China [51372272, 11474333, 9123302, 51372270, 21173260]
- Knowledge Innovation Program of the Chinese Academy of Sciences
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CH3NH3PbI3 perovskite solar cells with 2TPA-n-DP (TPA = 4,4'-((1E, 1'E,3E,3'E)-[1,1'-biphenyl]-4,4'-diylbis(buta-1,3-diene-4,1-diyl)); DP = bis(N,N-di-p-tolylaniline); n = 1, 2, 3, 4) as hole-transporting materials (HTMs) have been fabricated. After optimization of the mesoporous TiO2 film thickness, devices based on 2TPA-2-DP with power conversion efficiencies (PCEs) of up to 12.96% have been achieved, comparable to those of devices with (2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene) (spiro-OMeTAD) as HTM under similar conditions. Further time-resolved photoluminescence (PL) measurements showed a fast charge transfer process at the perovskite/2TPA-2-DP interface. With the aid of electrochemical impedance spectra, a study of the electron blocking ability of 2TPA-2-DP in the device reveals that the presence of 2TPA-2-DP can greatly increase charge transfer resistance at the HTM/Au interface in the device, thus reducing the recombination. Furthermore, the perovskite solar cells based on these four HTMs exhibit good stability after testing for one month.
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