Deposition Technologies of High-Efficiency CIGS Solar Cells: Development of Two-Step and Co-Evaporation Processes

作者：Huang Chia Hua^*; Chuang Wen Jie; Lin Chun Ping; Jan Yueh Lin; Shih Yu Chiu

来源：Crystals, 2018, 8(7): 296.

DOI：10.3390/cryst8070296

• CIGS solar cells
• two-step process
• co-evaporation process

The two-step process including the deposition of the metal precursors followed by heating the metal precursors in a vacuum environment of Se overpressure was employed for the preparation of Cu(In,Ga)Se-2 (CIGS) films. The CIGS films selenized at the relatively high Se flow rate of 25 angstrom/s exhibited improved surface morphologies. The correlations among the two-step process parameters, film properties, and cell performance were studied. With the given selenization conditions, the efficiency of 12.5% for the fabricated CIGS solar cells was achieved. The features of co-evaporation processes including the single-stage, bi-layer, and three-stage process were discussed. The characteristics of the co-evaporated CIGS solar cells were presented. Not only the surface morphologies but also the grading bandgap structures were crucial to the improvement of the open-circuit voltage of the CIGS solar cells. Efficiencies of over 17% for the co-evaporated CIGS solar cells have been achieved. Furthermore, the critical factors and the mechanisms governing the performance of the CIGS solar cells were addressed.

• 出版日期2018-7
• 单位东华大学