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 | |
刊名 | NANOTECHNOLOGY |
2019-04-19 | |
卷号 | 30期号:16 |
关键词 | formamidinium lead halide Br doping positron annihilation spectroscopy perovskite solar cells |
ISSN号 | 0957-4484 |
DOI | 10.1088/1361-6528/aafeb6 |
文献子类 | Article |
英文摘要 | 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. |
WOS研究方向 | Science & Technology - Other Topics ; Materials Science ; Physics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
内容类型 | 期刊论文 |
源URL | [http://ir.sic.ac.cn/handle/331005/27174] |
专题 | 中国科学院上海硅酸盐研究所 |
推荐引用方式 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). |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论