气候变化领域集成服务门户(CCPortal): Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: Proof of the field screening by mobile ions and determination of the space charge layer widths

CCPortal

DOI	10.1039/c6ee02914k
	Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: Proof of the field screening by mobile ions and determination of the space charge layer widths
	Belisle R.A.; Nguyen W.H.; Bowring A.R.; Calado P.; Li X.; Irvine S.J.C.; McGehee M.D.; Barnes P.R.F.; O'Regan B.C.
发表日期	2017
ISSN	17545692
起始页码	192
结束页码	204
卷号	10 期号:1
英文摘要	In Methyl Ammonium Lead Iodide (MAPI) perovskite solar cells, screening of the built-in field by mobile ions has been proposed as part of the cause of the large hysteresis observed in the current/voltage scans in many cells. We show that photocurrent transients measured immediately (e.g. 100 μs) after a voltage step can provide direct evidence that this field screening exists. Just after a step to forward bias, the photocurrent transients are reversed in sign (i.e. inverted), and the magnitude of the inverted transients can be used to find an upper bound on the width of the space charge layers adjacent to the electrodes. This in turn provides a lower bound on the mobile charge concentration, which we find to be ≳1 × 1017 cm-3. Using a new photocurrent transient experiment, we show that the space charge layer thickness remains approximately constant as a function of bias, as expected for mobile ions in a solid electrolyte. We also discuss additional characteristics of the inverted photocurrent transients that imply either an unusually stable deep trapping, or a photo effect on the mobile ion conductivity. © The Royal Society of Chemistry 2017.
英文关键词	Ammonium iodide; Electric space charge; Indium compounds; Iodine compounds; Ionic conduction; Ions; Layered semiconductors; Lead compounds; Perovskite; Photocurrents; Solar cells; Solid electrolytes; Built-in fields; Large hysteresis; Lower bounds; Mobile charge; Photo effect; Photocurrent transients; Space charge layers; Voltage step; Perovskite solar cells; ammonium; concentration (composition); electrode; fuel cell; halide; hysteresis; lead; perovskite; 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/190596
作者单位	Department of Materials Science and Engineering, Stanford University, 476 Lomita Mall, Stanford, CA 94305, United States; Department of Physics, Imperial College London, London, SW7 2AZ, United Kingdom; Centre for Solar Energy Research, Swansea University, Swansea, LL17 OJD, United Kingdom; Sunlight Scientific, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Belisle R.A.,Nguyen W.H.,Bowring A.R.,et al. Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: Proof of the field screening by mobile ions and determination of the space charge layer widths[J],2017,10(1).
APA	Belisle R.A..,Nguyen W.H..,Bowring A.R..,Calado P..,Li X..,...&O'Regan B.C..(2017).Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: Proof of the field screening by mobile ions and determination of the space charge layer widths.Energy & Environmental Science,10(1).
MLA	Belisle R.A.,et al."Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: Proof of the field screening by mobile ions and determination of the space charge layer widths".Energy & Environmental Science 10.1(2017).