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首页> 外文期刊>Photovoltaics, IEEE Journal of >Subcell Segmentation for Current Matching and Design Flexibility in Multijunction Solar Cells
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Subcell Segmentation for Current Matching and Design Flexibility in Multijunction Solar Cells

机译：用于多结太阳能电池电流匹配和设计灵活性的子单元分割

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摘要

Subcell segmentation is a method to obtain nearly ideal current-matching while employing nonideal bandgap combinations in high-efficiency multijunction solar cells. By splitting each subcell into multiple semitransparent pn junctions, called segments, current-matching can be satisfied by layer design rather than material selection. This architecture replaces the standard requirement for an optimal combination of bandgaps with a simpler requirement for optimal layer thicknesses in each series-connected segment. The total device current is divided across all segments, reducing the resistive power loss especially under nonuniform illumination or high to extreme concentration. Detailed balance-based analysis of three- and four-subcell devices in both terrestrial concentrator and one-sun space applications demonstrates that the segmented architecture can approach the theoretical efficiency peak using a broad range of physically realizable bandgap combinations. For example, detailed-balance analysis reveals a 7.5%–8.1% absolute efficiency improvement for 1-cm2 segmented cells compared with standard InGaP/InGaAs/Ge designs under 1000-suns AM1.5D illumination. Higher-order segmentation multiplies the number of segments in all subcells by a common multiple, which further reduces the device current, resistive power loss, and segment thicknesses.
机译：子单元分割是一种在高效多结太阳能电池中采用非剥离带隙组合的同时获得几乎理想的电流匹配的方法。通过将每个子单元分成多个半透明PN结，称为区段，可以通过层设计而不是材料选择来满足电流匹配。该架构替换了具有更简单要求的带隙的最佳组合的标准要求，以便在每个串联连接的段中的最佳层厚度。总设备电流分为所有区段，降低了电阻功率损耗，尤其是在非均匀照明或高于极端浓度下。地面集中器和一阳空空间应用中的三个和四子单元设备的详细余额分析表明，分段架构可以使用广泛的物理可实现的带隙组合来接近理论效率峰。例如，详细平衡分析显示1厘米的绝对效率提高7.5％-8.1％ 2 分段细胞与1000-SUNS AM1.5D照明的标准Ingap / IngaAs / GE设计相比。高阶分割将所有子单元中的段数乘以公共倍数，这进一步降低了器件电流，电阻功率损耗和段厚度。

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