Effect of Br content on phase stability and performance of H2N=CHNH2Pb(l(1-x)Br(x))(3) perovskite thin films

doi:10.1088/1361-6528/aafeb6

SIC OpenIR

	Effect of Br content on phase stability and performance of H2N=CHNH2Pb(l(1-x)Br(x))(3) perovskite thin films
	Ni, Xiaojie; Lei, Lei; Yu, Yu; Xie, Junjie; Li, Ming; Yang, Songwang; Wang, Mei; Liu, Jiandang; Zhang, Hongjun; Ye, Bangjiao
	2019-04-19
Source Publication	NANOTECHNOLOGY
ISSN	0957-4484
Volume	30 Issue:16
Subtype	Article
Abstract	Pristine and Br-doped H2N = CHNH2Pb(I1-xBrx)(3) (FAPb(I1-xBrx)(3), Br content x = 0, 0.05, 0.15, 0.2, 0.3, and 0.4) films were prepared. The effect of Br-doping on phase stability, defect density, and performance of FAPb(I1-xBrx)(3) was investigated by x-ray diffraction (XRD), scanning electron microscopy, ultraviolet-visible-near infrared absorbance spectroscopy, x-ray photoemission spectroscopy (XPS), Kelvin probe force microscopy (KPFM), positron annihilation spectroscopy, and current density-voltage (J-V) characteristics. The XRD measurements exhibit the enhancement of perovskite phase stability at x = 0.05. However, the phase stability decreases gradually with Br content (x) over 0.05. The increase of Br-doping content leads to the downshifting of both valence band (VB) position (indicated by XPS) and Fermi level (illustrated by KPFM). The energy level shifts are most probably due to the increase of Br 4p orbital content in VB and the change of self-doping levels. Doppler broadening spectra of positron annihilation radiation of the samples reveal that, the defect densities of Br-doped samples are much lower than that of pristine FAPbI(3). For FAPb(I0.95Br0.05)(3) sample, a high photoelectric conversion efficiency of 17.12% (25.7% higher than that of undoped sample) is successfully achieved. The significant enhancement of photoelectric conversion efficiency realized by Br-doping is attributed to the improvement of morphology, high phase stability, and low defect densities.
Keyword	formamidinium lead halide Br doping positron annihilation spectroscopy perovskite solar cells
DOI	10.1088/1361-6528/aafeb6
Language	英语
WOS Research Area	Science & Technology - Other Topics ; Materials Science ; Physics
Publisher	IOP PUBLISHING LTD
Citation statistics	Cited Times:1[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.sic.ac.cn/handle/331005/27174
Collection	中国科学院上海硅酸盐研究所
Recommended Citation GB/T 7714	Ni, Xiaojie,Lei, Lei,Yu, Yu,et al. Effect of Br content on phase stability and performance of H2N=CHNH2Pb(l(1-x)Br(x))(3) perovskite thin films[J]. NANOTECHNOLOGY,2019,30(16).
APA	Ni, Xiaojie.,Lei, Lei.,Yu, Yu.,Xie, Junjie.,Li, Ming.,...&Ye, Bangjiao.(2019).Effect of Br content on phase stability and performance of H2N=CHNH2Pb(l(1-x)Br(x))(3) perovskite thin films.NANOTECHNOLOGY,30(16).
MLA	Ni, Xiaojie,et al."Effect of Br content on phase stability and performance of H2N=CHNH2Pb(l(1-x)Br(x))(3) perovskite thin films".NANOTECHNOLOGY 30.16(2019).

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