Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
Publication date: 28th August 2024
The instability of metal halide perovskite solar cells is a major barrier to their widespread commercial implementation. For this reason, it is imperative to develop techniques to ameliorate the stability of these photovoltaic systems. Strain engineering is a promising approach to improve the stability and efficiency of perovskite solar cells, however nominally similar metal halide perovskites can display vastly different characteristics under near-identical strain conditions, making strain engineering difficult to successfully implement [1].
This poster will present results from optical spectroscopy measurements demonstrating the effects of mechanical strain on charger carrier recombination in metal halide perovskites. We developed a time-resolved hyperspectral microscope which can be used to investigate the optoelectronic properties of perovskites with sub-nanosecond resolution across a wide spectral range. Dynamic range of eight orders of magnitude has been achieved with this time-resolved system, meaning that decays can be detected over 200 µs after initial excitation.
We applied mechanical tensile stress in situ to CsPbBr3 microcrystals and utilising the developed time resolved hyperspectral microscope collected photoluminesence and time resolved photoluminesence spatial maps. It is shown that application of tensile strain suppresses photoluminescence emission of CsPbBr3 microcrystals but seemingly without changing the spectral shape of this emission. We will also discuss the effect of strain on charge carrier dynamics through analysis of monomolecular and bimolecular recombination coefficients.
The developed system will also be used to track z-diffusion of charge carriers post initial excitation. We will present initial measurements which show how this can be done.
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