Performance enhancement of ultrathin graded Cu(InGa)Se2 solar cells through modification of the basic structure and adding antireflective layers
Performance enhancement of ultrathin graded Cu(InGa)Se2 solar cells through modification of the basic structure and adding antireflective layers
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DOI：
10.1117/1.jpe.10.024504
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发表时间：
2020-04
影响因子：
1.7
通讯作者：
M. Amiri;A. Eskandarian;A. A. Ziabari-A.
中科院分区：
文献类型：
--
作者：
M. Amiri;A. Eskandarian;A. A. Ziabari-A.
抽象的。传统的 Cu ( InGa ) Se2 (CIGS) 太阳能电池由 Mo 底部接触层、p 型 CIGS 吸收层、n 型 CdS 缓冲层和 ZnO 窗口层组成，其中 ZnO 窗口层包括非常薄的本征 ZnO 层，顶部是 Al 掺杂 ZnO 透明导电氧化物层，该层由 Silvaco 技术计算机辅助设计模拟器模拟。层的厚度和其他参数仅限于文献中报告的值。检查模拟器以确认其功能，并应用逐步方法来优化基线结构。第一个修改是用无毒的 n 型 ZnO 缓冲层替代传统的 CdS 缓冲层。取代的 ZnO 缓冲层显示出有效的能带排列，并导致电池性能显着提高。第二个修改是包含不同的抗反射涂层，例如 Al2O3、MgO、SnO2 和 CdO，以增强光捕获。其中，CdO的效率最高。优化过程之后，替换了包含三个具有双梯度 Ga 含量的子层的极薄（750 nm）CIGS 层。测试了梯形梯度分布，结果显示内部电场显着增加，这有助于提高设备的效率。最后一次模拟得出的结论是，CIGS 太阳能电池的效率为 19.21%，与基线结构相关的效率提高了 36.24%。
Abstract. Traditional Cu ( InGa ) Se2 (CIGS) solar cells consist of an Mo bottom contact, p-type CIGS absorber layer, n-type CdS buffer layer, and ZnO window layer including a very thin intrinsic ZnO layer topped with an Al-doped ZnO transparent conducting oxide layer that was simulated by an Silvaco technology computer aided design simulator. The thickness of the layers and other parameters were limited to the values reported in the literature. The simulator was examined to affirm its functionality, and a step-by-step method was applied to optimize the baseline structure. The first modification was the substitution of the conventional CdS buffer layer with a nontoxic n-type ZnO buffer layer. The substituted ZnO buffer layer showed an effective band alignment and led to a remarkable improvement in cell performance. The second modification was the inclusion of different antireflective coatings, such as Al2O3, MgO, SnO2, and CdO, to enhance light trapping. Among them, CdO caused the highest efficiency. The optimization process was followed by replacing a very-thin (750 nm) CIGS layer containing three sublayers with dual-graded Ga contents. A trapezoidal gradient profile was tested and showed a significantly increased internal electric field, which assisted in raising the efficiency of the device. The last simulation concluded that the efficiency of a CIGS solar cell was 19.21% and the efficiency related to the baseline structure was enhanced by 36.24%.