Lobet Michaël, Piron Pierre, Dewalque Jennifer, Maho Anthony, Deparis Olivier, Henrist Catherine, Loicq Jérôme
Opt Express. 2019 Oct 28;27(22):32308-32322. doi: 10.1364/OE.27.032308.
Perovskite solar cells have shown a tremendous interest for photovoltaics since the past decade. However, little is known on the influence of light management using photonic crystals inside such structures. We present here numerical simulations showing the effect of photonic crystal structuring on the integrated quantum efficiency of perovskite solar cells. The photo-active layer is made of an opal-like perovskite structure (monolayer, bilayer or trilayer of perovskite spheres) built in a matrix. Fano resonances are exploited in order to enhance the absorption, especially near the bandgap of perovskite material. The excitation of quasi-guided modes inside the absorbing spheres enhances the integrated quantum efficiency and the photonic enhancement factor. More specifically, a photonic enhancement factor as high as 6.4 is predicted in the case of spheres monolayer compared to an unstructured perovskite layer. The influences of sphere's radius and incident angle on the absorbing properties are also estimated. Those numerical results can be applied to the nascent field of photonic structuring inside perovskite solar cells.
自过去十年以来，钙钛矿太阳能电池在光伏领域引起了极大的关注。然而，对于在这种结构中使用光子晶体进行光管理的影响却知之甚少。我们在此展示数值模拟，以说明光子晶体结构对钙钛矿太阳能电池积分量子效率的影响。光活性层由嵌入基质中的类蛋白石钙钛矿结构（钙钛矿球体的单层、双层或三层）制成。利用法诺共振来增强吸收，特别是在钙钛矿材料的带隙附近。吸收球体内准导模的激发提高了积分量子效率和光子增强因子。更具体地说，与无结构的钙钛矿层相比，在球体单层的情况下预测光子增强因子高达6.4。还估计了球体半径和入射角对吸收特性的影响。这些数值结果可应用于钙钛矿太阳能电池内部光子结构的新兴领域。
