High Photoluminescence Efficiency and Optically Pumped Lasing in Solution-Processed Mixed Halide Perovskite Semiconductors
High Photoluminescence Efficiency and Optically Pumped Lasing in Solution-Processed Mixed Halide Perovskite Semiconductors
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DOI：
10.1021/jz5005285
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发表时间：
2014-04-17
影响因子：
5.7
通讯作者：
Friend, Richard H.
中科院分区：
文献类型：
--
作者：
Deschler, Felix;Price, Michael;Friend, Richard H.
有机金属卤化铅钙钛矿在具有电子和空穴接受层的器件中表现出优异的光伏性能，对这些钙钛矿的电物理性质的研究有助于理解它们的电荷光生和复合机制，并揭示它们在其他光电应用中的潜力。我们报告令人惊讶的高光致发光（PL）量子效率，高达70%，在这些溶液处理的结晶膜。我们发现，在原始的CH 3 NH3 PbI 3-xClx钙钛矿的光激发结果在1 ps内的自由电荷载流子的形成，这些自由电荷载流子进行双分子复合的时间尺度为10秒至100秒的ns。为了证实CH 3 NH3 PbI 3-xClx钙钛矿的高发光产率，我们构建并演示了光泵浦垂直腔激光器的操作，该激光器包括在介质镜和蒸发的金顶镜之间的钙钛矿层。这些长的载流子寿命与异常高的发光产率一起在这种简单制备的无机半导体中是前所未有的，并且我们注意到这些特性非常适合光伏二极管操作。
The study of the photophysical properties of organic-metallic lead halide perovskites, which demonstrate excellent photovoltaic performance in devices with electron- and hole-accepting layers, helps to understand their charge photogeneration and recombination mechanism and unravels their potential for other optoelectronic applications. We report surprisingly high photoluminescence (PL) quantum efficiencies, up to 70%, in these solution-processed crystalline films. We find that photoexcitation in the pristine CH3NH3PbI3-xClx perovskite results in free charge carrier formation within 1 ps and that these free charge carriers undergo bimolecular recombination on time scales of 10s to 100s of ns. To exemplify the high luminescence yield of the CH3NH3PbI3-xClx perovskite, we construct and demonstrate the operation of an optically pumped vertical cavity laser comprising a layer of perovskite between a dielectric mirror and evaporated gold top mirrors. These long carrier lifetimes together with exceptionally high luminescence yield are unprecedented in such simply prepared inorganic semiconductors, and we note that these properties are ideally suited for photovoltaic diode operation.