不同环境(空气或真空)和光浸泡后薄膜钙钛矿的输运参数和缺陷状态的研究

IF 1.9 Q3 PHYSICS, APPLIED
C. Longeaud
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引用次数: 2

摘要

我们提出了一些先进的表征技术来研究薄膜半导体的光电特性,并将它们应用于钙钛矿层。这两种技术分别是稳态光载波光栅(SSPG)和傅立叶变换光电流光谱(FTPS)。SSPG被用来研究载流子的双极性扩散长度,而FTPS被用来测量下面的间隙吸收系数随光能的变化,给出导致这种吸收的间隙缺陷密度的信息。首先详细介绍了这些技术的潜力,然后举例说明了它们在薄膜钙钛矿上的应用。为了研究它们的稳定性,将这些薄膜暴露在不同的环境中,空气或真空,在沉积状态下或经过强光浸泡后。我们发现,即使在光浸泡后,状态的扩散长度和密度也相当稳定,并且表明器件暴露于1太阳下的退化主要来自触点的演变,而不是钙钛矿本身。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of transport parameters and defect states in thin film perovskites under different environments − air or vacuum − and after light-soaking
We present some advanced characterization techniques developed to investigate on the opto-electronic properties of thin film semiconductors and apply them to perovskite layers. These techniques are the steady state photocarrier grating (SSPG) and the Fourier transform photocurrent spectroscopy (FTPS). The SSPG was developed to study the ambipolar diffusion length of carriers and the FTPS was imagined to measure the variations of the below gap absorption coefficient with the light energy, giving information on the defect densities of the gap responsible for this absorption. The potentialities of these techniques are first detailed and then exemplified by their application to thin film perovskites. To study their stability, these films were exposed to different environments, air or vacuum, and in their as-deposited state or after light-soaking with heavy light. We find that the diffusion length and density of states are quite stable, even after light-soaking, and suggest that the degradation of devices exposed to 1 sun mainly comes from the evolution of the contacts instead of the perovkite itself.
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来源期刊
EPJ Photovoltaics
EPJ Photovoltaics PHYSICS, APPLIED-
CiteScore
2.30
自引率
4.00%
发文量
15
审稿时长
8 weeks
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