A long-lived hot carrier population is critical in order to develop working hot carrier photovoltaic devices with efficiencies exceeding the Shockley-Queisser limit. Here, we report photoluminescence from hot-carriers with unexpectedly long lifetime (a few ns) in formamidinium tin triiodide. An unusual large blue shift of the time-integrated photoluminescence with increasing excitation power (150 meV at 24 K and 75 meV at 293 K) is displayed. On the basis of the analysis of energy-resolved and time-resolved photoluminescence, we posit that these phenomena are associated with slow hot carrier relaxation and state-filling of band edge states. These observations are both important for our understanding of lead-free hybrid perovskites and for an eventual future development of efficient lead-free perovskite photovoltaics.

中文翻译：

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甲ami三碘化锡钙钛矿中的热载流子寿命长，并且蓝移大。

长寿命的热载流子群对于开发效率超过Shockley-Queisser极限的热载流子光伏器件至关重要。在这里，我们报告了三碘甲form锡中具有异常长寿命（几ns）的热载流子的光致发光。随着激发功率的增加（在24 K下为150 meV，在293 K下为75 meV），时间积分光致发光出现了异常的大蓝移。在对能量分辨和时间分辨光致发光的分析的基础上，我们假定这些现象与缓慢的热载流子弛豫和能带边缘态的填充有关。这些观察结果对于我们对无铅混合钙钛矿的理解以及对最终有效的无铅钙钛矿光伏技术的最终发展都非常重要。