Interfaces in metal halide perovskite devices

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Metal halide perovskite photovoltaics are an incredibly exciting solar technology due to theirhigh performance and potential for low-cost solar panels. Whilst these materials alone haveproven to result in high performance solar cells, their chemical tunability makes themparticularly attractive for tandem photovoltaic technologies. This PhD project will focus onwide band gap metal halide perovskites - these are a critical component of any perovskitebased tandem photovoltaic. Presently, the performance of wide bandgap perovskite solarcells is constrained well below their theoretical maximum performance. This is in large partdue to chemical heterogeneity in the perovskite semiconductor layer within thesephotovoltaics which leads to a significant reduction in achievable voltages. Relatedly, thereis also strong evidence to suggest that the heterogeneity of the perovskite semiconductorcan result in instabilities within PV devices accelerating their degradation. This PhD project will investigate the chemical and subsequent electronic heterogeneity inphotovoltaic devices based on wide band gap perovskites. Using a combination ofphotophysical and photoelectron spectroscopies the chemistry of a range of wide band gapperovskites will be investigated. The relationship between the chemistry of the perovskiteand how this influences its charge carrier dynamics will be determined. This will allow us tounderstand the origin of voltage losses within these materials and develop strategies toovercome them. Furthermore, we will explore the relationship between chemicalheterogeneity and device stability under a range of different accelerated ageing conditionswhich mimic real world deployment of photovoltaics.