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DOI	10.1039/c6ee03014a
	Photovoltaic mixed-cation lead mixed-halide perovskites: Links between crystallinity, photo-stability and electronic properties
	Rehman W.; McMeekin D.P.; Patel J.B.; Milot R.L.; Johnston M.B.; Snaith H.J.; Herz L.M.
发表日期	2017
ISSN	17545692
起始页码	361
结束页码	369
卷号	10 期号:1
英文摘要	Lead mixed halide perovskites are highly promising semiconductors for both multi-junction photovoltaic and light emitting applications due to their tunable band gaps, with emission and absorption energies spanning the UV-visible to near IR regions. However, many such perovskites exhibit unwanted halide segregation under photo-illumination, the cause of which is still unclear. In our study, we establish crucial links between crystal phase stability, photostability and optoelectronic properties of the mixed-cation lead mixed-halide perovskite CsyFA(1-y)Pb(BrxI(1-x))3. We demonstrate a region for caesium content between 0.10 < y < 0.30 which features high crystalline quality, long charge-carrier lifetimes and high charge-carrier mobilities. Importantly, we show that for such high-quality perovskites, photo-induced halide segregation is strongly suppressed, suggesting that high crystalline quality is a prerequisite for good optoelectronic quality and band gap stability. We propose that regions of short-range crystalline order aid halide segregation, possibly by releasing lattice strain between iodide rich and bromide rich domains. For an optimized caesium content, we explore the orthogonal halide-variation parameter space for Cs0.17FA0.83Pb(BrxI(1-x))3 perovskites. We demonstrate excellent charge-carrier mobilities (11-40 cm2 V-1 s-1) and diffusion lengths (0.8-4.4 μm) under solar conditions across the full iodide-bromide tuning range. Therefore, the addition of caesium yields a more photo-stable perovskite system whose absorption onsets can be tuned for bandgap-optimized tandem solar cells. © The Royal Society of Chemistry 2017.
英文关键词	Carrier mobility; Crystalline materials; Electronic properties; Energy gap; Light emission; Perovskite; Perovskite solar cells; Positive ions; Segregation (metallography); Solar cells; Absorption energies; Absorption onset; Crystalline order; Halide perovskites; High-crystalline quality; Optoelectronic properties; Tandem solar cells; Variation parameter; Lead compounds; absorption; bromide; cation; cesium; crystallinity; fuel cell; lead; perovskite; photovoltaic system; semiconductor industry; solar power
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/190581
作者单位	Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, United Kingdom
推荐引用方式 GB/T 7714	Rehman W.,McMeekin D.P.,Patel J.B.,et al. Photovoltaic mixed-cation lead mixed-halide perovskites: Links between crystallinity, photo-stability and electronic properties[J],2017,10(1).
APA	Rehman W..,McMeekin D.P..,Patel J.B..,Milot R.L..,Johnston M.B..,...&Herz L.M..(2017).Photovoltaic mixed-cation lead mixed-halide perovskites: Links between crystallinity, photo-stability and electronic properties.Energy & Environmental Science,10(1).
MLA	Rehman W.,et al."Photovoltaic mixed-cation lead mixed-halide perovskites: Links between crystallinity, photo-stability and electronic properties".Energy & Environmental Science 10.1(2017).