D. Catana, M. Zaki, I. Simandan, A. Buruiana, Florinel Sava, A. Velea
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引用次数: 0
摘要
Cu2ZnSnSe4 薄膜是通过两次磁控溅射沉积,并在 550 °C 的低真空、锡+硒和富硒气氛中进行两次交错沉积后热处理而合成的。通过采用连续的结构分析方法,即冰晶入射 X 射线衍射 (GIXRD) 和拉曼光谱,确定了与主要沸石相共存的 ZnSe 等次生相。扫描电子显微镜(SEM)可窥探样品的表面形态,发现结构缺陷和晶粒轮廓,而 EDS 实验则显示了非化学计量元素组成。我们的样品中的光带隙是根据记录的透射光谱通过广泛使用的外推法计算得出的,其值在 1.42 至 2.01 eV 之间。了解次生相和结构缺陷出现背后的过程,并找到减轻其对太阳能电池性能影响的方法,是目前研究的首要目标。
Understanding the Effects of Post-Deposition Sequential Annealing on the Physical and Chemical Properties of Cu2ZnSnSe4 Thin Films
Cu2ZnSnSe4 thin films have been synthesized by employing two magnetron-sputtering depositions, interlaced with two sequential post-deposition heat treatments in low vacuum, Sn+Se and Se–rich atmospheres at 550 °C. By employing successive structural analysis methods, namely Grazing Incidence X–Ray Diffraction (GIXRD) and Raman Spectroscopy, secondary phases such as ZnSe coexisting with the main kesterite phase have been identified. SEM peered into the surface morphology of the samples, detecting structural defects and grain profiles, while EDS experiments showed off–stoichiometric elemental composition. The optical bandgaps in our samples were calculated by a widely used extrapolation method from recorded transmission spectra, holding values from 1.42 to 2.01 eV. Understanding the processes behind the appearance of secondary phases and occurring structural defects accompanied by finding ways to mitigate their impact on the solar cells’ properties is the prime goal of the research beforehand.