The 2D Ruddlesden- Popper perovskite (EPEA)2PbI4 was investigated using temperature - and power -dependent PL and TA spectroscopy. This endeavor revealed the presence of multiple excitonic complexes in these materials, with signatures of carrier redistribution mediated by power and/or temperature, and the presence of extremely long-lived dark states in TA. These states appear to be light -induced defects which heal after illumination ceases. As such, they bring new insight into failure mechanisms and material design approaches in perovskite photovoltaics
Metal halide perovskites are emerging as an intriguing class of solution-based semiconductors with significant potential for photovoltaics. In this study we investigate the triple halide perovskite (FA,Cs)Pb(I,Br,Cl)3, which is known to be amongst the most stable metal halide perovskite systems available. This stability allows a comprehensive study of the hot carrier dynamics to be assessed under steady-state conditions at high fluence and various temperatures in a device structure.Here, we show measurements support the presence of hot carriers in the device in advance of any negative effects due to halide segregation or decomposition.
Metal-halide perovskites are emerging as an intriguing class of semiconductors with significant potential for photovoltaics. Here, several perovskites are discussed that have been assessed via various experimental techniques to determine the effects of their composition, dimensionality, and structural stability on hot carriers and polaron formation. It will be shown that polarons formed in these systems are strongly affected by the binding energy and nature of the excitons in the materials. Notably, the hot carrier dynamics in perovskites is strongly affected by their low thermal conductivity, which inhibits the dissipation of heat in the material.
Metal halide perovskites are a leading contender to disrupt not only terrestrial photovoltaic (PV) markets, but also the proliferating space PV markets. This is due to their impressive power conversion efficiencies, potentially low cost, and adaptability to flexible architectures. Here we assess the stability of three perovskite systems; a mixed Pb-Sn perovskite, and two mixed cation-triple halide systems. In all cases high tolerance to proton irradiation was observed. However, in the case of the mixed Pb-Sn system, irreversible decomposition of the perovskite along with the increased prevalence of defects was observed with thermal cycling. In the case of the mixed cation triple halides remarkable stability was demonstrated, in addition to self-healing, the results of which will be described here.
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