Experimental Determination of Complex Optical Constants of Air‐Stable Inorganic CsPbI3 Perovskite Thin Films,Physica Status Solidi-Rapid Research Letters

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Experimental Determination of Complex Optical Constants of Air‐Stable Inorganic CsPbI3 Perovskite Thin Films
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-04-07 , DOI: 10.1002/pssr.202000070
Wensheng Yan ₁ , Yi Guo ₂ , Deski Beri ₁ , Stephan Dottermusch ₁ , Haining Chen ₂ , Bryce S. Richards _{1,

3}

Affiliation

Air‐stable inorganic cesium lead iodide (CsPbI₃) perovskite thin films with a bandgap of 1.7 eV are a promising candidate for tandem cell solar cells, comprising a perovskite top cell with a crystalline silicon bottom cell. The device design and simulations are important to develop high‐efficiency photovoltaic devices. However, knowledge of complex optical constants of the CsPbI₃ thin films is mandatory to complement such tasks. Herein, air‐stable inorganic CsPbI₃ perovskite thin films are prepared using one‐step synthesis through a spin‐coating method. Variable angle spectroscopic ellipsometry (VASE) is then conducted at five angles (43.9°, 48.9°, 53.9°, 58.9°, and 63.9°) to obtain ellipsometric data (Ψ and Δ). The thickness nonuniformity model of the perovskite thin film combined with an effective medium approximation for describing rough surface is adopted to achieve excellent fitting. The complex optical constants of the CsPbI₃ thin film are experimentally obtained in the wavelength range of 300–1200 nm. The present results open the door for design and simulations on high‐efficiency CsPbI₃/c‐Si tandem solar cells.

中文翻译：

空气稳定性无机CsPbI3钙钛矿薄膜复光学常数的实验测定

带隙为1.7 eV的空气稳定的无机碘化铯碘化铅（CsPbI ₃）钙钛矿薄膜是串联电池太阳能电池的有前途的候选者，包括具有晶体硅底部电池的钙钛矿顶部电池。器件设计和仿真对于开发高效光伏器件很重要。但是，必须具备CsPbI ₃薄膜的复杂光学常数知识才能补充此类任务。在此，空气稳定的无机CsPbI ₃钙钛矿薄膜是通过旋涂法一步合成而制备的。然后以五个角度（43.9°，48.9°，53.9°，58.9°和63.9°）进行可变角光谱椭圆仪（VASE），以获得椭圆仪数据（data和Δ）。钙钛矿薄膜的厚度不均匀性模型结合有效的介质近似值（用于描述粗糙表面）被采用，以实现出色的拟合度。CsPbI ₃薄膜的复数光学常数是在300–1200 nm的波长范围内通过实验获得的。目前的结果为高效CsPbI ₃ / c-Si串联太阳能电池的设计和仿真打开了大门。

更新日期：2020-04-07

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