Impact of Dimensionality on Optoelectronic Properties of Hybrid Perovskites
Impact of Dimensionality on Optoelectronic Properties of Hybrid Perovskites
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DOI：
10.1155/2021/8822703
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发表时间：
2021-03
影响因子：
3.2
通讯作者：
Washat Ware;Tia Wright;Antony Davita;E. Danilov;B. Gautam
中科院分区：
文献类型：
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作者：
Washat Ware;Tia Wright;Antony Davita;E. Danilov;B. Gautam
有机金属卤化物是光伏应用中很有前途的材料，具有可调的电子水平、优异的电荷传输和薄膜器件制造的简单性。二维（2D）钙钛矿由于其有趣的光学和电学性质而成为比三维（3D）钙钛矿更有前途的候选者。然而，最大限度地提高能量转换效率是提高太阳能电池性能的关键问题。在这项工作中，我们使用稳态和时间分辨吸收和发射光谱研究了二维（2D）钙钛矿（CH3NH3）2Pb(SCN)2I2薄膜的光物理性质，并将其与三维（3D）对应的CH3NH3PbI3进行了比较。我们观察到与CH3NH3PbI3相比，（CH3NH3）2Pb(SCN)2I2具有更高的带隙和更快的电荷重组。这项工作为钙钛矿结构的基本光物理过程提供了更好的理解，并为太阳能电池的设计、合成和制造提供了指导。
Organometal halides are promising materials for photovoltaic applications, offering tunable electronic levels, excellent charge transport, and simplicity of thin-film device fabrication. Two-dimensional (2D) perovskites have emerged as promising candidates over three-dimensional (3D) ones due to their interesting optical and electrical properties. However, maximizing the power conversion efficiency is a critical issue to improve the performance of these solar cells. In this work, we studied the photophysics of a two-dimensional (2D) perovskite (CH3NH3)2Pb(SCN)2I2 thin film using steady-state and time-resolved absorption and emission spectroscopy and compared it with the three-dimensional (3D) counterpart CH3NH3PbI3. We observed a higher bandgap and faster charge recombination in (CH3NH3)2Pb(SCN)2I2 compared to CH3NH3PbI3. This work provides an improved understanding of fundamental photophysical processes in perovskite structures and provides the guideline for the design, synthesis, and fabrication of solar cells.