Interfaces in metal halide perovskite devices

金属卤化物钙钛矿光伏是一种令人难以置信的令人兴奋的太阳能技术，因为它们具有高性能和低成本太阳能电池板的潜力。虽然这些材料本身已经被证明可以制造高性能的太阳能电池，但它们的化学可调整性使它们对串联式光伏技术特别有吸引力。这个博士项目将专注于宽禁带金属卤化物钙钛矿--这是任何基于钙钛矿的串联式光伏发电的关键组成部分。目前，宽禁带钙钛矿太阳能电池的性能被限制在远低于其理论最大性能的水平。这在很大程度上是由于这些光伏中钙钛矿半导体层中的化学不均匀导致了可实现电压的显着降低。与之相关的是，也有强有力的证据表明，钙钛矿半导体的异质性会导致光伏器件中的不稳定性加速它们的退化。这个PHD项目将研究基于宽禁带钙钛矿的光伏器件中的化学和随后的电子异质性。利用光物理和光电子能谱相结合的方法，我们将研究一系列宽带钙钛矿的化学结构。我们将确定钙钛矿的化学成分与其载流子动力学之间的关系。这将使我们能够了解这些材料中电压损失的来源，并制定克服它们的策略。此外，我们将探索在一系列不同的加速老化条件下化学异质性与器件稳定性之间的关系，这模拟了真实世界中光伏的部署。

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.