How Internal Electric Fields Can Suppress Electron-Hole Recombination in Perovskite Solar Cells
Mark van Schilfgaarde a, Scott Mckechnie a
a Kings College London, Strand, London, United Kingdom
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Swansea, United Kingdom, 2016 June 29th - July 1st
Organizers: James Durrant, Henry Snaith and David Worsley
Poster, Scott Mckechnie, 177
Publication date: 28th March 2016

Perovskite solar cells have shaken up the field of photovoltaic research with the fastest gains in power-conversion efficiency on record. They have the enticing combination of high efficiency and low cost, a result of being both solution processable and comprising earth-abundant materials. There has been an explosion in research interest with a plethora of material combinations being explored. Despite all this, there remains uncertainty about the fundamental device physics. A notable puzzle is the presence of non-Langevin behaviour: there is a surprisingly small bimolecular recombination rate given the modest charge-carrier mobilities. This poster investigates the role of large internal electric fields in reducing the electron-hole recombination rate. The electric fields can have different origins and can lead to charge separation in either real or reciprocal space, both of which can result in suppressed electron-hole recombination. The details of these mechanisms are presented and discussed, with a focus on reciprocal space splitting.



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