GeSe is a promising absorber material for photovoltaic applications due to its attractive material, optical, and electrical properties as well as its low toxicity and earth abundance. The first GeSe‐based solar cell with 1.48% efficiency has been recently reported through self‐regulated rapid thermal sublimation. However, most of the fundamental physical and electronic properties of GeSe such as refractive index, dielectric constant, carrier mobility, lifetime, and diffusion length remain unclear, despite the necessity of this for the design of high‐performance GeSe solar cells. In this work, the above basic properties of GeSe are systematically studied by using spectroscopic ellipsometry, space charge limited current measurements, and transient absorption spectroscopy. These comprehensive results provide a solid foundation for the further development of GeSe solar cells.

中文翻译：

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光伏应用GeSe的物理和电子性质研究

GeSe具有诱人的材料，光学和电学特性以及低毒性和大地丰度，是一种用于光伏应用的有前途的吸收剂材料。最近有报道称，通过自我调节的快速热升华，第一个效率为1.48％的基于GeSe的太阳能电池。然而，尽管对于高性能GeSe太阳能电池设计而言，GeSe的大多数基本物理和电子特性（如折射率，介电常数，载流子迁移率，寿命和扩散长度）仍不清楚。在这项工作中，通过使用光谱椭圆偏振法，空间电荷限制电流测量和瞬态吸收光谱系统地研究了GeSe的上述基本特性。