Modelling interfaces in thin-film photovoltaic devices

Jones, Michael, Dawson, James A., Campbell, Stephen, Barrioz, Vincent, Whalley, Lucy and Qu, Yongtao (2022) Modelling interfaces in thin-film photovoltaic devices. Frontiers in Chemistry, 10. p. 920676. ISSN 2296-2646

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Abstract

Developing effective device architectures for energy technologies---such as solar cells, rechargeable batteries or fuel cells---does not only depend on the performance of a single material, but on the performance of multiple materials interfaced together. A key part of this is understanding the behaviour at the interfaces between these materials. In the context of a solar cell, efficient charge transport across the interface is a pre-requisite for devices with high conversion efficiencies.There are several methods that can be used to simulate interfaces, each with an in-built set of approximations, limitations and length-scales. These methods range from those that consider only composition e.g. data-driven approaches) to continuum device models e.g. drift-diffusion models using the Poisson equation) and ab-initio atomistic models e.g. density functional theory). Here is an introduction to interface models at various levels of theory, highlighting the capabilities and limitations of each. In addition, a discussion of several of the various physical and chemical processes at a heterojunction interface, highlighting the complex nature of the problem and the challenges it presents for theory and simulation.

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