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DOI	10.1039/c8ee01136b
	Fractional deviations in precursor stoichiometry dictate the properties, performance and stability of perovskite photovoltaic devices
	Fassl P.; Lami V.; Bausch A.; Wang Z.; Klug M.T.; Snaith H.J.; Vaynzof Y.
发表日期	2018
ISSN	17545692
起始页码	3380
结束页码	3391
卷号	11 期号:12
英文摘要	The last five years have witnessed remarkable progress in the field of lead halide perovskite materials and devices. Examining the existing body of literature reveals staggering inconsistencies in the reported results among different research groups with a particularly wide spread in the photovoltaic performance and stability of devices. In this work we demonstrate that fractional, quite possibly unintentional, deviations in the precursor solution stoichiometry can cause significant changes in the properties of the perovskite layer as well as in the performance and stability of perovskite photovoltaic devices. We show that while the absorbance and morphology of the layers remain largely unaffected, the surface composition and energetics, crystallinity, emission efficiency, energetic disorder and storage stability are all very sensitive to the precise stoichiometry of the precursor solution. Our results elucidate the origin of the irreproducibility and inconsistencies of reported results among different groups as well as the wide spread in device performance even within individual studies. Finally, we propose a simple experimental method to identify the exact stoichiometry of the perovskite layer that researchers can employ to confirm their experiments are performed consistently without unintentional variations in precursor stoichiometry. © 2018 The Royal Society of Chemistry.
英文关键词	Lead compounds; Perovskite; Stability; Device performance; Emission efficiencies; Experimental methods; Fractional deviation; Halide perovskites; Photovoltaic devices; Photovoltaic performance; Precursor solutions; Stoichiometry; absorbance; crystallinity; emission; energetics; performance assessment; perovskite; photovoltaic system; stoichiometry
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190063
作者单位	Kirchhoff-Institut für Physik, Centre for Advanced Materials, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 227, Heidelberg, 69120, Germany; Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, OX1 3PU, United Kingdom
推荐引用方式 GB/T 7714	Fassl P.,Lami V.,Bausch A.,et al. Fractional deviations in precursor stoichiometry dictate the properties, performance and stability of perovskite photovoltaic devices[J],2018,11(12).
APA	Fassl P..,Lami V..,Bausch A..,Wang Z..,Klug M.T..,...&Vaynzof Y..(2018).Fractional deviations in precursor stoichiometry dictate the properties, performance and stability of perovskite photovoltaic devices.Energy & Environmental Science,11(12).
MLA	Fassl P.,et al."Fractional deviations in precursor stoichiometry dictate the properties, performance and stability of perovskite photovoltaic devices".Energy & Environmental Science 11.12(2018).