期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 6, 期 5, 页码 875-880出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.5b00182
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资金
- Australian Government through the Australian Renewable Energy Agency (ARENA)
- Australian Research Council [FT110100523, DP140100463, DP140102849]
- National Research Foundation of Korea - Ministry of Education, Science, and Technology [NRF-2013S1A2A2035418]
- Australian Research Council [FT110100523] Funding Source: Australian Research Council
The past 2 years have seen the uniquely rapid emergence of a new class of solar cell based on mixed organic-inorganic halide perovskite. Grain boundaries are present in polycrystalline thin film solar cell, and they play an important role that could be benign or detrimental to solar-cell performance. Here we present efficient charge separation and collection at the grain boundaries measured by KPFM and c-AFM in CH3NH3PbI3 film in a CH3NH3PbI3/TiO2/FTO/glass heterojunction structure. We observe the presence of a potential barrier along the grain boundaries under dark conditions and higher photovoltage along the grain boundaries compare to grain interior under the illumination. Also, c-AFM measurement presents higher short-circuit current collection near grain boundaries, confirming the beneficial roles grain boundaries play in collecting carriers efficiently.
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