The existence and impact of persistent ferroelectric domains in MAPbI3
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- National Renewable Energy Lab. (NREL), Golden, CO (United States); Institut Photovoltaique d'lle de France, Palaiseau (France)
- Colorado School of Mines, Golden, CO (United States)
- Colorado State Univ., Fort Collins, CO (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- The Pennsylvania State Univ., University Park, PA (United States)
Methylammonium lead iodide (MAPbI3) exhibits exceptional photovoltaic performance, but there remains substantial controversy over the existence and impact of ferroelectricity on the photovoltaic response. We confirm ferroelectricity in MAPbI3 single crystals and demonstrate mediation of the electronic response by ferroelectric domain engineering. The ferroelectric response sharply declines above 57°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. As a result, the ability to control the ferroelectric response provides routes to increase device stability and photovoltaic performance through domain engineering.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Center for Next Generation of Materials by Design: Incorporating Metastability (CNGMD); National Renewable Energy Laboratory (NREL), Golden, CO (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; USDOE Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- AC36-08GO28308; AC02-05CH11231
- OSTI ID:
- 1494979
- Alternate ID(s):
- OSTI ID: 1560588
- Report Number(s):
- NREL/JA-5K00-68090
- Journal Information:
- Science Advances, Vol. 5, Issue 1; ISSN 2375-2548
- Publisher:
- AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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