Journal
NANO LETTERS
Volume 15, Issue 10, Pages 6514-6520Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b02126
Keywords
Perovskite; solar cell; heterojunction; built-in potential; working mechanism
Categories
Funding
- Air Force Office of Scientific Research (AFOSR) [FA9550-09-1-0610]
- National Science Foundation [NSF ECCS-1202231]
- China Scholarship Council [201406160004]
- WNLO
- 973 Program of China [2014CB643506, 2013CB922104, 2011CBA00703]
- NSFC [21161160445, 21173091]
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In this communication, we report an efficient and flexible perovskite solar cell based on formamidinium lead trihalide (FAPbI(3)) with simplified configuration. The device achieved a champion efficiency of 12.70%, utilizing direct contact between metallic indium tin oxide (ITO) electrode and perovskite absorber. The underlying working mechanism is proposed subsequently, via a systematic investigation focusing on the heterojunction within this device. A significant charge storage has been observed in the perovskite, which is believed to generate photovoltage and serves as the driving force for charge transferring from the absorber to ITO electrode as well. More importantly, this simplified device structure on flexible substrates suggests its compatibility for scale-up fabrication, which paves the way for commercialization of perovskite photovoltaic technology.
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