Enhancing photoluminescence yields in lead halide perovskites by photon recycling and light out-coupling
Enhancing photoluminescence yields in lead halide perovskites by photon recycling and light out-coupling
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DOI：
10.1038/ncomms13941
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发表时间：
2016-12-23
影响因子：
16.6
通讯作者：
Friend, Richard H.
中科院分区：
文献类型：
--
作者：
Richter, Johannes M.;Abdi-Jalebi, Mojtaba;Friend, Richard H.
在卤化铅钙钛矿太阳能电池中，在太阳光照下开路时存在电子-空穴对到光子到电子-空穴对的至少一个再循环事件。这可导致外部光致发光产率相对于内部产率的显著降低。在这里，我们表明，对于70%的内部产量，我们测量的外部产量低至15%的平面膜，其中光耦合是低效的，但观察值高达57%的纹理基板上的膜，提高了耦合。我们详细分析了如何外部测量的速率常数和光致发光效率与光子回收下的内部复合过程。为此，我们研究了光激发载流子的动力学，并使用速率方程与辐射和非辐射复合事件测量的光致发光效率。我们得出结论，使用纹理有源层有能力提高LED和太阳能电池的功率转换效率。
In lead halide perovskite solar cells, there is at least one recycling event of electron-hole pair to photon to electron-hole pair at open circuit under solar illumination. This can lead to a significant reduction in the external photoluminescence yield from the internal yield. Here we show that, for an internal yield of 70%, we measure external yields as low as 15% in planar films, where light out-coupling is inefficient, but observe values as high as 57% in films on textured substrates that enhance out-coupling. We analyse in detail how externally measured rate constants and photoluminescence efficiencies relate to internal recombination processes under photon recycling. For this, we study the photo-excited carrier dynamics and use a rate equation to relate radiative and non-radiative recombination events to measured photoluminescence efficiencies. We conclude that the use of textured active layers has the ability to improve power conversion efficiencies for both LEDs and solar cells.