期刊
SCIENCE ADVANCES
卷 5, 期 1, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aas9311
关键词
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资金
- Center for the Next Generation of Materials by Design, a U.S. Department of Energy, Office of Science EFRC [DE-AC36-08GO28308]
- NREL Director's Fellowship LDRD program
- NSF [DMR-1420620]
- Department of Energy [DE-EE0007545]
- French Agence Nationale de la Recherche [ANR-17-MPGA-0012]
- hybrid perovskite solar cell program of the National Center for Photovoltaics - U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Office of Solar Energy Technology [DE-AC36-08GO28308DOE]
- NREL
Methylammonium lead iodide (MAPbI(3)) exhibits exceptional photovoltaic performance, but there remains substantial controversy over the existence and impact of ferroelectricity on the photovoltaic response. We confirm ferroelectricity in MAPbI(3) single crystals and demonstrate mediation of the electronic response by ferroelectric domain engineering. The ferroelectric response sharply declines above 57 degrees C, consistent with the tetragonal-to-cubic phase transition. Concurrent band excitation piezoresponse force microscopy-contact Kelvin probe force microscopy shows that the measured response is not dominated by spurious electrostatic interactions. Large signal poling (> 16 V/cm) orients the permanent polarization into large domains, which show stabilization over weeks. X-ray photoemission spectroscopy results indicate a shift of 400 meV in the binding energy of the iodine core level peaks upon poling, which is reflected in the carrier concentration results from scanning microwave impedance microscopy. The ability to control the ferroelectric response provides routes to increase device stability and photovoltaic performance through domain engineering.
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