Abstract Multi-junction solar cells are considered for various applications, as they tackle various loss mechanisms for single junction solar cells. These losses include thermalization and non-absorption below the band gap. In this work, a tandem configuration comprising copper-indium-gallium-di-selenide (CIGS) and hydrogenated amorphous silicon (a-Si:H) absorber layers is studied. Two main challenges are addressed in this work. Firstly, the natural roughness of CIGS is unfavorable for monolithically growing a high quality a-Si:H top cell. Some sharp textures in the CIGS induce shunts in the a-Si:H top junction, limiting the electrical performance of such a configuration. To smoothen this interface, the possibility of mechanically polishing the intermediate i-ZnO layer has been explored. The second challenge that is addressed, is the significant current mismatch in these tandem architectures. To enhance absorption in the current-limiting top cell, the ZnO:Al front electrode was textured by means of wet-etching the entire tandem stack. We demonstrated that one can manipulate the morphology of the random textures by varying the growth conditions of the ZnO:Al, leading to better light management in these devices.

中文翻译：

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用于两端混合串联太阳能电池的先进光管理技术

摘要 多结太阳能电池被考虑用于各种应用，因为它们解决了单结太阳能电池的各种损耗机制。这些损失包括带隙以下的热化和非吸收。在这项工作中，研究了包含铜铟镓二硒化物 (CIGS) 和氢化非晶硅 (a-Si:H) 吸收层的串联配置。这项工作解决了两个主要挑战。首先，CIGS 的自然粗糙度不利于单片生长高质量的 a-Si:H 顶部电池。CIGS 中的一些尖锐纹理会在 a-Si:H 顶部结中引起分流，从而限制了这种配置的电气性能。为了平滑这个界面，已经探索了机械抛光中间 i-ZnO 层的可能性。解决的第二个挑战，是这些串联架构中的显着电流失配。为了增强限流顶部电池的吸收，ZnO:Al 前电极通过湿法蚀刻整个串联堆叠进行纹理化。我们证明了可以通过改变 ZnO:Al 的生长条件来操纵随机纹理的形态，从而在这些设备中实现更好的光管理。