About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Alloys and Compounds for Thermoelectric and Solar Cell Applications X
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Presentation Title |
Giant Isotopic Shift in Phonons Keeps Charge Carriers Hot Longer in a Photovoltaic Perovskite |
Author(s) |
Michael E. Manley, Kunlun Hong, Panchao Yin, Hsin Wang, Songxue Chi, Luke Daemen, Andrew May, Chengyun Hua, Raphael Hermann, Mark Asta, Yao Cai, Mahshid Ahmadi |
On-Site Speaker (Planned) |
Michael E. Manley |
Abstract Scope |
Hot-carrier solar cells provide a way to convert sunlight to electricity more efficiently than conventional solar cells by harnessing charge carriers before they lose energy to heat. It is therefore desirable to design materials with long hot charge carrier cooling times. Hot charge carriers thermalize through carrier–optic phonon scattering, followed by optic phonon decay to acoustic phonons and finally thermal conduction. A hot-phonon bottleneck, where hot charge carrier cooling through the phonons is blocked, can significantly extend this cooling time. We use neutron scattering and other techniques to show that thermal conduction can be reduced by swapping out a lighter isotope for a heavier one in the organic molecule of the high-performance photovoltaic material methylammonium lead iodide. The effect on phonons of the heavier isotope is to reduce the thermal conductivity by half and delay the cooling of hot carriers – extending their useful lifetime for energy conversion (https://doi.org/10.1126/sciadv.aaz1842). |
Proceedings Inclusion? |
Planned: |
Keywords |
Electronic Materials, Energy Conversion and Storage, Characterization |