In this work, Cu(In,Ga)Se₂ (CIGS) solar cells on polyimide (PI) substrates were fabricated using a low-temperature three-stage co-evaporation process. To enhance device performance, the CIGS films were extrinsically doped with alkali (Na and K) using an in-situ post deposition treatment (PDT). To account for mechanisms of extrinsic alkali incorporation in CIGS solar cells on flexible polyimide, the alkali dopant concentrations in the film bulk (intragrain and grain boundary) and the surface chemistries/band structures were quantitatively investigated with various advanced characterization methods. In addition, the effects of the PDT sequences on the resulting device performance were studied with a particular emphasis on the characteristics of CIGS surfaces. By controlling the alkali incorporation into the CIGS absorber films, flexible lightweight CIGS thin-film solar cells with an efficiency of approximately 19% were obtained.

在这项工作中，使用低温三阶段共蒸发工艺在聚酰亚胺（PI）基板上制造了Cu（In，Ga）Se ₂（CIGS）太阳能电池。为了增强器件性能，CIGS薄膜使用原位外加碱（Na和K）进行了掺杂。沉积后处理（PDT）。为了考虑在柔性聚酰亚胺上CIGS太阳能电池中外源性碱结合的机理，采用各种先进的表征方法对膜体（晶格和晶界）中的碱掺杂剂浓度以及表面化学/能带结构进行了定量研究。此外，研究了PDT序列对所得器件性能的影响，并特别强调了CIGS表面的特性。通过控制向CIGS吸收膜中掺入的碱，可获得效率约为19％的柔性轻质CIGS薄膜太阳能电池。