Quantifying Photon Recycling in Solar Cells and Light-Emitting Diodes: Absorption and Emission Are Always Key
Quantifying Photon Recycling in Solar Cells and Light-Emitting Diodes: Absorption and Emission Are Always Key
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DOI：
10.1103/physrevlett.125.067401
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发表时间：
2020-08-05
影响因子：
8.6
通讯作者：
Stranks, Samuel D.
中科院分区：
文献类型：
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作者：
Bowman, Alan R.;Anaya, Miguel;Stranks, Samuel D.
近年来，在卤化物钙钛矿中观察到光子回收，引起了越来越多的关注。它已被证明可以降低有效的双分子重组率，从而增加材料内的激发密度。这里我们介绍了一个可以应用于任何材料的光子回收量化的一般框架。我们将我们的模型应用于基于卤化物钙钛矿的理想太阳能电池和发光二极管。通过改变影响光子回收的可控参数，即厚度、电荷捕获率、界面处的非理想透射率和吸收率，我们量化了每个参数对光子回收的影响。在这两种器件类型中，我们证明了最大化吸收和发射过程对于优化器件仍然是至关重要的，即使这是以光子回收为代价的。我们的研究结果为量化光电器件中的光子回收提供了新的见解，并证明光子回收并不总是被视为一个有益的过程。
Photon recycling has received increased attention in recent years following its observation in halide perovskites. It has been shown to lower the effective bimolecular recombination rate and thus increase excitation densities within a material. Here we introduce a general framework to quantify photon recycling which can be applied to any material. We apply our model to idealized solar cells and light-emitting diodes based on halide perovskites. By varying controllable parameters which affect photon recycling, namely, thickness, charge trapping rate, nonideal transmission at interfaces, and absorptance, we quantify the effect of each on photon recycling. In both device types, we demonstrate that maximizing absorption and emission processes remains paramount for optimizing devices, even if this is at the expense of photon recycling. Our results provide new insight into quantifying photon recycling in optoelectronic devices and demonstrate that photon recycling cannot always be seen as a beneficial process.