期刊
SURFACES AND INTERFACES
卷 10, 期 -, 页码 93-99出版社
ELSEVIER
DOI: 10.1016/j.surfin.2017.12.006
关键词
Metal ions diffusion; Interface stabilty; Chromium oxide; Copper doping; Perovskite solar cells
类别
资金
- Natural Science Foundation of Hubei Province [2014CFB275]
- National High Technology Research and Development Program [2015AA050601]
- Science Foundation of Wuhan Institute of Technology [K201311]
- Youths Science Foundation of Wuhan Institute of Technology [Q201108]
The stability of perovskite solar cell (PSC) is still a major challenge although it has recently demonstrated high power conversion efficiencies (PCEs) of over 22%. Here, the PCE degradation resulting from the chromium ions diffusion has been investigated in the inverted structured PSC by X-ray photoelectron spectroscopy. Elemental depth profiles indicate that chromium ions diffuse at CH3NH3PbI3/CrOx interface to change its p-type semi-conducting properties with the content alteration of chromium in CrOx film, resulting in the instability of CrOx based device. With copper doping, the formation of CuCrO2 could suppress the diffusion of metal ions and the formation of hexavalent chromium ions and surface hydrate phase CrO(OH)/Cr(OH)(3), and then decrease the chance to react with CH3NH3PbI3 (or its degradation product). Consequently, the stability is improved for the Cu:CrOx-based device. The direct evidence helps us to understand metal ionic diffusion phenomena in hole-transfer layer of PSC, which is very important for the long-term stability and performance of PSC.
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