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Optoelectronics 2022
银纳米颗粒增强CsPbIBr2钙钛矿光伏器件的模拟研究
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Abstract:
在入射光的激发下，银纳米颗粒(Ag NPs)表面发生的局域表面等离激元共振效应具有近场增强的作用，这种效应有望增强对CsPbIBr2钙钛矿材料的激发态密度从而提高光伏器件的光电转换效率。另外，Ag NPs的前向散射会提高入射光的光程，有助于提高光吸收。基于此，本文设计了基于Ag NPs的局域表面等离激元增强型CsPbIBr2钙钛矿光伏器件，利用Ag NPs改善结构为FTO/ZnO/CsPbIBr2/Carbon的CsPbIBr2光伏器件的性能。我们利用时域有限差分法对基于Ag NPs的局域表面等离激元增强型CsPbIBr2钙钛矿光伏器件结构进行了相关的数值模拟，通过调控模型中FTO衬底表面上Ag NPs的间隔尺寸得到了具有不同Ag NPs表面覆盖比的CsPbIBr2钙钛矿光伏器件，进而模拟得到器件的吸收率以及各光伏器件剖面的电场分布情况。模拟结果表明，Ag NPs的局域表面等离激元增强效应以及前向散射效应有望改善CsPbIBr2钙钛矿光伏器件的性能，在理论上预言了本文设计的可行性，也为实验制备高效CsPbIBr2光伏器件提供了一定的理论指导。
Under the action of incident light, local surface plasmon resonance (LSPR) would appear around the surface of Ag Nano particles (NPs), and LSPR has the effect of near-field enhancement. In addition, Ag NPs possess the forward scattering effect to the incident light, which can also improve the performance of CsPbIBr2-based PSCs to some extent. Considering that these effects are expected to improve the performance of CsPbIBr2 photovoltaic devices, Ag NPs are designed and prepared for LSP-enhanced CsPbIBr2 photovoltaic devices. The specific design of this paper is to use Ag NPs for enhancing the performance of CsPbIBr2 photovoltaic devices with the basic structure of FTO/ZnO/CsPbIBr2/Carbon. And then, the finite difference time domain (FDTD) method is employed to simulate the structure of the designed solar cell devices. The device models with different Ag NPs surface coverage ratio (SC) are obtained by controlling the interval size of Ag NPs on the FTO substrate surface. The simulated absorptivity and also the simulated electric field distribution of each cross section are obtained. By analyzing the simulation results, the feasibility of the design in this paper is verified theoretically, which also provides guidance for the subsequent experiments of CsPbIBr2 perovskite solar cell.
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