气候变化领域集成服务门户(CCPortal): I2 vapor-induced degradation of formamidinium lead iodide based perovskite solar cells under heat-light soaking conditions

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DOI	10.1039/c9ee02043h
	I2 vapor-induced degradation of formamidinium lead iodide based perovskite solar cells under heat-light soaking conditions
	Fu F.; Pisoni S.; Jeangros Q.; Sastre-Pellicer J.; Kawecki M.; Paracchino A.; Moser T.; Werner J.; Andres C.; Duchêne L.; Fiala P.; Rawlence M.; Nicolay S.; Ballif C.; Tiwari A.N.; Buecheler S.
发表日期	2019
ISSN	17545692
起始页码	3074
结束页码	3088
卷号	12 期号:10
英文摘要	Over the last years, the operational stability of perovskite solar cells has been significantly improved by compositional engineering, interface modification, and improved encapsulation techniques. However, irreversible degradation is still ubiquitously observed during the first 1000 hours of operation, particularly at elevated temperatures. In this work, we elucidate a major mechanism controlling this degradation. For that, formamidinium lead iodide-based perovskite solar cells were stressed under continuous 1 sun illumination at 80 °C in N2, before extensive characterization of their microstructure and composition. The cell active area and hence the photocurrent are found to decrease with time due to the growth of porous PbI2-rich regions. This degradation was observed to originate from a few seed points in the perovskite bulk rather than from the interfaces with the charge-selective layers or from the cell edges. I2 vapor, first released at these defective points and then further released from the decomposition of the perovskite exposed to this vapor, controls the degradation process. Furthermore, this autocatalytic degradation process is shown to locally rupture the top electrode due to vapor pressure build-up. In addition to highlighting the detrimental influence of residual PbI2, we show that such a degradation pathway can be alleviated by reducing the methylammonium and/or iodine content, providing a path to more stable perovskite solar cells. © 2019 The Royal Society of Chemistry.
英文关键词	Cell engineering; Iodine compounds; Layered semiconductors; Lead compounds; Perovskite; Process control; Autocatalytic degradation; Degradation pathways; Degradation process; Elevated temperature; Induced degradation; Interface modification; Irreversible degradation; Operational stability; Perovskite solar cells; catalysis; catalyst; detection method; fuel cell; inorganic compound; perovskite
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/189814
作者单位	Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Microengineering (IMT), Photovoltaics and Thin-Film Electronics Laboratory (PV-Lab), Rue de la Maladière 71b, Neuchâtel, 2002, Switzerland; Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, Duebendorf, CH-8600, Switzerland; Laboratory for Nanoscale Materials Science, Empa-Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, Duebendorf, CH-8600, Switzerland; Department of Physics, University of Basel, Basel, CH-4056, Switzerland; CSEM, PV-Center, Jaquet-Droz 1, Neuchâtel, 2002, Switzerland; Materials for Energy Conversion, Empa-Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, Duebendorf, CH-8600, Switzerland
推荐引用方式 GB/T 7714	Fu F.,Pisoni S.,Jeangros Q.,et al. I2 vapor-induced degradation of formamidinium lead iodide based perovskite solar cells under heat-light soaking conditions[J],2019,12(10).
APA	Fu F..,Pisoni S..,Jeangros Q..,Sastre-Pellicer J..,Kawecki M..,...&Buecheler S..(2019).I2 vapor-induced degradation of formamidinium lead iodide based perovskite solar cells under heat-light soaking conditions.Energy & Environmental Science,12(10).
MLA	Fu F.,et al."I2 vapor-induced degradation of formamidinium lead iodide based perovskite solar cells under heat-light soaking conditions".Energy & Environmental Science 12.10(2019).