Monolithically interconnected lamellar Cu(In,Ga)Se2 micro solar cells under full white light concentration
Monolithically interconnected lamellar Cu(In,Ga)Se2 micro solar cells under full white light concentration
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全白光聚光下单片互连层状 Cu(In,Ga)Se2 微型太阳能电池
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
M. Lux‐Steiner
中科院分区：
文献类型：
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作者：
B. Reinhold;M. Schmid;D. Greiner;Manuel Schüle;D. Kieven;A. Ennaoui;M. Lux‐Steiner
薄膜太阳能电池已经受益于显着的材料和能源节省。通过使用光子管理，可以进一步提高转换效率和功率密度，包括降低材料成本。在这项工作中，在集中白光照明（1-50×）下研究了微米尺寸的 Cu(In,Ga)Se2 (CIGS) 薄膜太阳能电池。电池设计基于工业标准化、具有单片互连（P 划线）的层状太阳能电池。为了表征并联和串联电阻分布及其对器件性能的影响，单元宽度从 1900μm 逐步减小至 200μm，P1 划线厚度在 45 至 320μm 之间变化。将结果与标准几何形状的宏观太阳能电池和具有环形触点的点状微电池进行比较。在集中白光下，与 1 个太阳光照下的初始值相比，层状微电池的最大转换效率绝对值可提高 3.8% 以上，点状微电池的绝对值可提高 4.8% 以上。功率密度可分别提高 51 倍和 70 倍。但显然，最佳浓度水平和性能改进很大程度上取决于所选择的电池几何形状、所使用的接触方法和电气材料特性。事实证明，在没有显着优化的情况下，广泛使用的工业薄膜太阳能电池设计模式不能简单地用于制备微聚光CIGS太阳能电池模块。根据实验和模拟结果，提出了电池设计的修改方案。版权所有 © 2015 约翰·威利父子有限公司
Thin film solar cells already benefit from significant material and energy savings. By using photon management, the conversion efficiency and the power density can be enhanced further, including a reduction of material costs. In this work, micrometer‐sized Cu(In,Ga)Se2 (CIGS) thin film solar cells were investigated under concentrated white light illumination (1–50×). The cell design is based on industrially standardized, lamellar shaped solar cells with monolithic interconnects (P‐scribe). In order to characterize the shunt and serial resistance profiles and their impact on the device performance the cell width was reduced stepwise from 1900 to 200 µm and the P1‐scribe thickness was varied between 45 and 320 µm. The results are compared to macroscopic solar cells in standard geometry and dot‐shaped microcells with ring contacts. Under concentrated white light, the maximal conversion efficiency could be increased by more than 3.8% absolute for the lamellar microcells and more than 4.8% absolute in case of dot‐shaped microcells compared to their initial values at 1 sun illumination. The power density could be raised by a factor of 51 and 70, respectively. But apparently, the optimum concentration level and the improvement in performance strongly depend on the chosen cell geometry, the used contact method and the electrical material properties. It turns out, that the widely used industrial thin film solar cell design pattern cannot simply be adapted to prepare micro‐concentrator CIGS solar modules, without significant optimization. Based on the experimental and simulated results, modifications for the cell design are proposed. Copyright © 2015 John Wiley & Sons, Ltd.