气候变化领域集成服务门户(CCPortal): Revealing the origin of voltage loss in mixed-halide perovskite solar cells

CCPortal

DOI	10.1039/c9ee02162k
	Revealing the origin of voltage loss in mixed-halide perovskite solar cells
	Mahesh S.; Ball J.M.; Oliver R.D.J.; McMeekin D.P.; Nayak P.K.; Johnston M.B.; Snaith H.J.
发表日期	2020
ISSN	17545692
起始页码	258
结束页码	267
卷号	13 期号:1
英文摘要	The tunable bandgap of metal-halide perovskites has opened up the possibility of tandem solar cells with over 30% efficiency. Iodide-bromide (I-Br) mixed-halide perovskites are crucial to achieve the optimum bandgap for such tandems. However, when the Br content is increased to widen the bandgap, cells fail to deliver the expected increase in open-circuit voltage (VOC). This loss in VOC has been attributed to photo-induced halide segregation. Here, we combine Fourier transform photocurrent spectroscopy (FTPS) with detailed balance calculations to quantify the voltage loss resulting from halide segregation, thus providing a means to quantify the impact of the low bandgap iodide-rich phases on performance. Our results indicate that, contrary to popular belief, halide segregation is not the dominant VOC loss mechanism in Br-rich wide bandgap cells. Rather, the loss is dominated by the relatively low initial radiative efficiency of the cells, which arises from both imperfections within the absorber layer, and at the perovskite/charge extraction layer heterojunctions. We thus identify that focussing on maximising the initial radiative efficiency of the mixed-halide films and devices is more important than attempting to suppress halide segregation. Our results suggest that a VOC of up to 1.33 V is within reach for a 1.77 eV bandgap perovskite, even if halide segregation cannot be suppressed. © 2020 The Royal Society of Chemistry.
英文关键词	Bromine compounds; Efficiency; Energy gap; Heterojunctions; Open circuit voltage; Perovskite; Perovskite solar cells; Absorber layers; Detailed balance; Halide perovskites; Loss mechanisms; Photocurrent spectroscopy; Radiative efficiency; Tandem solar cells; Tunable Band-gap; Metal halides; energy efficiency; fuel cell; 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/189747
作者单位	Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom; Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
推荐引用方式 GB/T 7714	Mahesh S.,Ball J.M.,Oliver R.D.J.,et al. Revealing the origin of voltage loss in mixed-halide perovskite solar cells[J],2020,13(1).
APA	Mahesh S..,Ball J.M..,Oliver R.D.J..,McMeekin D.P..,Nayak P.K..,...&Snaith H.J..(2020).Revealing the origin of voltage loss in mixed-halide perovskite solar cells.Energy & Environmental Science,13(1).
MLA	Mahesh S.,et al."Revealing the origin of voltage loss in mixed-halide perovskite solar cells".Energy & Environmental Science 13.1(2020).