Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
DOI: https://doi.org/10.29363/nanoge.abxpvperopto.2018.096
Publication date: 11th December 2017
Slowed photoexcited carrier cooling is highly desirable for developing hot-carrier solar cell, as it allows potential efficiency close to the thermodynamical limit in ideal conditions. Here, the optoelectronic properties of FASnI3 as a function of excitation density and temperature are investigated. Hot-carrier light emission in tin-based hybrid perovskite (FASnI3) with lifetime > 1 nanosecond is observed. An unusual large blue shift of the time-integrated photoluminescence with increasing the excitation power (150 meV at 24 K, and 75 meV at 293 K) is displayed. On the basis of an analysis of energy- and time-resolved photoluminescence, these phenomena are likely associated with slow hot carrier relaxation and state-filling of band edge states. Noteworthy, we measured highly efficient hot carrier emission also under continuous-wave excitation, which is a fundamental step towards hot carrier solar cells. The observation of these phenomena provides important physical insight into the relatively unexplored excited-state character of tin halide perovskites, which is essential for the further development of lead-free solar cells and other optoelectronic devices based on hot carriers.
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