Among the many materials investigated for next-generation photovoltaic cells, organic-inorganic lead halide perovskites have demonstrated great potential thanks to their high power conversion efficiency and solution processability. Within a short period of about 5 years, the efficiency of solar cells based on these materials has increased dramatically from 3.8 to over 20%. Despite the tremendous progress in device performance, much less is known about the underlying photophysics involving charge-orbital-lattice interactions and the role of the organic molecules in this hybrid material remains poorly understood. Here, we report a giant photostrictive response, that is, light-induced lattice change, of >1,200 p.p.m. in methylammonium lead iodide, which could be the key to understand its superior optical properties. The strong photon-lattice coupling also opens up the possibility of employing these materials in wireless opto-mechanical devices.

中文翻译：

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有机-无机卤化铅钙钛矿中的巨大光析。

在研究用于下一代光伏电池的多种材料中，有机-无机卤化铅钙钛矿具有巨大的潜力，这归功于其高功率转换效率和溶液可加工性。在大约5年的短时间内，基于这些材料的太阳能电池的效率已从3.8％急剧提高到20％以上。尽管器件性能取得了巨大进步，但对涉及电荷-轨道-晶格相互作用的潜在光物理知之甚少，而有机分子在这种杂化材料中的作用仍然知之甚少。在这里，我们报道了巨大的光致伸缩响应，即在甲基铵碘化铅中，光诱导的晶格变化> 1,200 ppm，这可能是了解其卓越光学性能的关键。