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DOI	10.1039/c8ee01576g
	How transport layer properties affect perovskite solar cell performance: Insights from a coupled charge transport/ion migration model
	Courtier N.E.; Cave J.M.; Foster J.M.; Walker A.B.; Richardson G.
发表日期	2019
ISSN	1754-5692
起始页码	396
结束页码	409
卷号	12 期号:1
英文摘要	The effects of transport layers on perovskite solar cell performance, in particular anomalous hysteresis, are investigated. A model for coupled ion vacancy motion and charge transport is formulated and solved in a three-layer planar perovskite solar cell. Its results are used to demonstrate that the replacement of standard transport layer materials (spiro-OMeTAD and TiO 2 ) by materials with lower permittivity and/or doping leads to a shift in the scan rates at which hysteresis is most pronounced to rates higher than those commonly used in experiment. These results provide a cogent explanation for why organic electron transport layers can yield seemingly "hysteresis-free" devices but which nevertheless exhibit hysteresis at low temperature. In these devices the decrease in ion vacancy mobility with temperature compensates for the increase in hysteresis rate with use of low permittivity/doping organic transport layers. Simulations are used to classify features of the current-voltage curves that distinguish between cells in which charge carrier recombination occurs predominantly at the transport layer interfaces and those where it occurs predominantly within the perovskite. These characteristics are supplemented by videos showing how the electric potential, electronic and ionic charge profiles evolve across a planar perovskite solar cell during a current-voltage scan. Design protocols to mitigate the possible effects of high ion vacancy distributions on cell degradation are discussed. Finally, features of the steady-state potential profile for a device held near the maximum power point are used to suggest ways in which interfacial recombination can be reduced, and performance enhanced, via tuning transport layer properties. © 2019 The Royal Society of Chemistry.
语种	英语
scopus关键词	Electric potential; Electron transport properties; Hysteresis; Ions; Permittivity; Perovskite; Perovskite solar cells; Temperature; Titanium dioxide; Cell degradations; Charge carrier recombination; Current voltage curve; Electron transport layers; Low temperatures; Maximum power point; Solar cell performance; Steady-state potentials; Solar cells; electric field; electron; fuel cell; hysteresis; interface; mobility; model; performance assessment; permittivity; perovskite; solar power; temperature
来源期刊	Energy and Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162422
作者单位	Mathematical Sciences, University of SouthamptonSO17 1BJ, United Kingdom; Department of Physics, University of BathBA2 7AY, United Kingdom; Department of Mathematics, University of PortsmouthPO1 3HF, United Kingdom
推荐引用方式 GB/T 7714	Courtier N.E.,Cave J.M.,Foster J.M.,et al. How transport layer properties affect perovskite solar cell performance: Insights from a coupled charge transport/ion migration model[J],2019,12(1).
APA	Courtier N.E.,Cave J.M.,Foster J.M.,Walker A.B.,&Richardson G..(2019).How transport layer properties affect perovskite solar cell performance: Insights from a coupled charge transport/ion migration model.Energy and Environmental Science,12(1).
MLA	Courtier N.E.,et al."How transport layer properties affect perovskite solar cell performance: Insights from a coupled charge transport/ion migration model".Energy and Environmental Science 12.1(2019).