Journal
CHEMSUSCHEM
Volume 7, Issue 11, Pages 3088-3094Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201402566
Keywords
carbon; electrochemistry; kinetics; perovskite phases; solar cells
Funding
- 973 Program of China [2014CB643506, 2013CB922104, 2011CBA00703]
- NSFC [21103057, 21161160445, 21173091]
- CME
- Program of New Century Excellent Talents in University [NCET-10-0416]
- Carl von Ossietzky University of Oldenburg
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This work reports on an investigation into interfacial charge transfer in CH3NH3PbI3 perovskite solar cells by using anatase TiO2 nanocuboids enclosed by active {100} and {001} facets. The devices show 6.0 and 8.0% power conversion efficiency with and without hole-transport material. Transient photovoltage/photocurrent decay and charge extraction, as well as impedance spectroscopy measurements, reveal that carbon materials are effective counter electrodes in perovskite solar cells. The photogenerated charges are observed to be stored in mesoporous TiO2 film under illumination and in the CH3NH3PbI3 layer in the dark. The use of 2,2,7,7-tetrakis(N,N-di-p-methoxyphenylamine)-9,9-spirobifluorene (spiro-MeOTAD) as a hole-transport material accelerates interfacial charge recombination between the photogenerated electrons and holes.
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