DOI: https://doi.org/10.29363/nanoge.hopv.2016.177
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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