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Interfacial engineering and film-forming mechanism of perovskite films revealed by synchrotron-based GIWAXS at SSRF for high performance solar cells

Shanglei Feng  Lifeng Yang  Yingguo Yang  
【摘要】:Organic-inorganic hybrid perovskites as promising light-harvesting materials have been the focus of scientific research and development of photovoltaics recently.Especially,metal halide perovskites currently become one of the most competitive candidates for the fabrication of solar cells with record certified efficiency over 25%.Despite the high efficiency,many fundamental questions remain unclear and need to be addressed at both the material and device levels,such as weaker stability,poorer reproducibility,easier degradation influenced by water,oxygen,thermal factors,and so on.Based on the Shanghai Synchrotron Radiation Facility(SSRF),we have established an advanced perovskite photovoltaic device preparation and in-line test system,developed a series of unique surface diffraction analysis methods based on ex situ and in situ grazing incidence wide angle X-ray scattering(GIWAXS),and reported a large number of novel synchrotron radiation results on crystallization of the perovskite photovoltaics films~([1-8]).Our main investigations are aimed to deeply in-situ study the perovskite film growth dynamics using synchrotron radiation GIWAXS technology in combination with a customized mini online glove box(c(H_2O,O_2)1 ppm) and temperature-humidity control equipment,and so on.,which should provide solid theoretical background and point to the useful direction for designing and fabricating high-performance perovskites solar cells.

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