Light Absorption and Recycling in Hybrid Metal Halide Perovskite Photovoltaic Devices
Light Absorption and Recycling in Hybrid Metal Halide Perovskite Photovoltaic Devices
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DOI：
10.1002/aenm.201903653
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发表时间：
2020-02-03
影响因子：
27.8
通讯作者：
Johnston, Michael B.
中科院分区：
文献类型：
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作者：
Patel, Jay B.;Wright, Adam D.;Johnston, Michael B.
生产高效的单结和多结金属卤化物钙钛矿（MHP）太阳能电池需要仔细优化这些器件的光学和电学特性。在这里，通过使用双源共蒸发，在太阳能电池器件中证明了CH3NH3PbI3钙钛矿层的精确控制。光吸收和器件性能进行跟踪纳入MHP膜范围从约67 nm到约1.4 μ m的厚度和转移矩阵光学建模是用来量化的光损耗所产生的干涉效应。基于这些结果，具有19.2%的稳态功率转换效率的装置通过并入具有接近最佳预测厚度（近似709 nm）的钙钛矿膜来实现。值得注意的是，在具有与优化器件相同厚度（约709 nm）的钙钛矿膜中观察到光子重吸收的明显特征。尽管与光子再吸收相关的光子再循环的积极效果，但由于MHP的“死体积”中的竞争性非辐射电荷复合，具有较厚（>750 nm）MHP层的器件表现出较差的性能。总的来说，这些发现表明需要对MHP厚度进行精细控制以实现最高效率的电池，并准确考虑光子重吸收、光学干涉和电荷传输特性。
The production of highly efficient single- and multijunction metal halide perovskite (MHP) solar cells requires careful optimization of the optical and electrical properties of these devices. Here, precise control of CH3NH3PbI3 perovskite layers is demonstrated in solar cell devices through the use of dual source coevaporation. Light absorption and device performance are tracked for incorporated MHP films ranging from approximate to 67 nm to approximate to 1.4 mu m thickness and transfer-matrix optical modeling is utilized to quantify optical losses that arise from interference effects. Based on these results, a device with 19.2% steady-state power conversion efficiency is achieved through incorporation of a perovskite film with near-optimum predicted thickness (approximate to 709 nm). Significantly, a clear signature of photon reabsorption is observed in perovskite films that have the same thickness (approximate to 709 nm) as in the optimized device. Despite the positive effect of photon recycling associated with photon reabsorption, devices with thicker (>750 nm) MHP layers exhibit poor performance owing to competing nonradiative charge recombination in a "dead-volume" of MHP. Overall, these findings demonstrate the need for fine control over MHP thickness to achieve the highest efficiency cells, and accurate consideration of photon reabsorption, optical interference, and charge transport properties.