The metal halide perovskites afford several important features including excellent optical properties that are tunable by controlling the chemical compositions, ambipolar charge transport, and long electron and hole diffusion lengths. We will present our results in devising effective ways and solution-based methods to process lead and tin based perovskites into layers deposited over other materials such as electron or acceptor layers. The solution processing of perovskites for solar cells is a challenge. The deposition of continuous and homogeneous films in a multilayer system, which contains other layers below and above is a huge issue that needs to be understood and tackled. This is because electron transport happens across the diverse interfaces of the layers. We are tackling important questions such as what electron donor structural and organizational features in a solar cell maximize light capture and energy harvesting with minimal geminate recombination? Which perovskite material and film processing strategies enhance these characteristics? Solar cells based on MeNH3PbI3 perovskites have progressed significantly and reached power conversion efficiencies of ~20%, approaching the efficiency of commercialized c-Si solar cells. Because of the toxicity of Pb however the search is on for lead free alternatives. In this talk we will report on the chemistry of tin-based perovskite compounds their chemical and physical properties as well as phase transitions. The challenges for controlling the carrier concentrations, chemical stability and various interfaces between different materials and several promising and exciting directions will be presented.

Lead free inorganic-organic hybrid perovskites: Chemistry and solar cells

251st National Meeting (2016)

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