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首页> 外文期刊>Journal of nano research >CdTe/PbTe Superlattice Modeling and Fabrication for Solar Cells Applications
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CdTe/PbTe Superlattice Modeling and Fabrication for Solar Cells Applications

机译：用于太阳能电池的CdTe / PbTe超晶格建模与制造

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Tuning the bandgap of superlattice structures creates devices with unique optical, electronic and mechanical properties. Designing solar cells with superlattice structures increases the range of light energy absorbed from the solar spectrum in the device. A superlattice is a nanostructure composed of alternating thin layers of two materials. The thickness of the constituent materials alters the optical bandgap of the superlattice. This paper discusses a mathematical model which computes the effective bandgap of a CdTe/PbTe superlattice based on a given thickness of the CdTe and PbTe films. The output of this model is verified by fabricating superlattices with different thickness and measuring their effective bandgaps. The electrochemical atomic layer deposition method is used to fabricate the superlattice structures. The advantage of this method over other vacuum techniques is that it is inexpensive and operates at room temperature. This paper also discusses a method to mitigate the lattice mismatch between the substrate and the superlattice. The optical bandgaps, crystallinity, grain size and chemical composition of the structures are measured using a spectrometer, diffractometer, transmission electron microscope and scanning electron microscope, respectively. The bandgaps of the fabricated superlattices were in agreement with the simulated values. This model can be used for designing the bandgaps of superlattices which can be incorporated in solar cells.
机译：调整超晶格结构的带隙可创建具有独特光学，电子和机械性能的器件。设计具有超晶格结构的太阳能电池会增加设备中从太阳光谱吸收的光能范围。超晶格是由两种材料的交替薄层组成的纳米结构。组成材料的厚度改变了超晶格的光学带隙。本文讨论了一个数学模型，该模型基于给定的CdTe和PbTe膜厚度计算CdTe / PbTe超晶格的有效带隙。通过制造不同厚度的超晶格并测量其有效带隙来验证该模型的输出。电化学原子层沉积方法用于制造超晶格结构。与其他真空技术相比，此方法的优势在于它便宜且可在室温下运行。本文还讨论了一种减轻衬底和超晶格之间晶格失配的方法。分别使用光谱仪，衍射仪，透射电子显微镜和扫描电子显微镜测量结构的光学带隙，结晶度，晶粒尺寸和化学组成。所制造的超晶格的带隙与模拟值一致。该模型可用于设计可并入太阳能电池的超晶格带隙。

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