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Título: | Combining temperature and pressure-dependent PL measurements to benchmark electron-phonon interaction effects in hybrid perovskites |
Autor: | Francisco López, Adrián; Charles, Bethan; Weber, Oliver J.; Alonso Carmona, M. Isabel CSIC ORCID ; Garriga, Miquel CSIC ORCID; Campoy Quiles, Mariano CSIC ORCID ; Weller, Mark T.; Goñi, Alejandro R. CSIC ORCID | Fecha de publicación: | 7-may-2019 | Resumen: | Among other peculiarities, lead halide perovskites exhibit an atypical temperature dependence of the fundamental optical gap: it decreases in energy with decreasing temperature. So far, reports ascribe such a behavior to a particularly strong electron-phonon renormalization of the band gap, neglecting completely contributions from thermal expansion. However, high pressure experiments performed, for instance, on the archetypal perovskite MAPbI3, yield a negative pressure coefficient for the gap of the tetragonal room-temperature phase, which speaks against the assumption of a negligible gap shift due to thermal expansion. Here I will show that, combining PL measurements as a function of temperature but ambient pressure and pressure-dependent PL measurements at room temperature, it is possible to assess the equal footing of thermal expansion and electron-phonon coupling regarding the temperature-induced gap renormalization in MAPbI3. Furthermore, this result possesses general validity, holding also for the tetragonal or cubic phase, stable at ambient conditions, of most halide perovskite counterparts. | URI: | http://hdl.handle.net/10261/210232 |
Aparece en las colecciones: | (ICMAB) Comunicaciones congresos |
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