Short-circuit current improvement in CdTe solar cells by combining a ZnO buffer layer and a solution back contact

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• 作者：Eun Seok Cha ; Young Min Ko ; Seon Cheol Kim ; Byung Tae Ahn ; ^{btahn@kaist.ac.kr}
• 关键词：CdTe solar cells ; ZnO buffer layer ; Cu solution contact ; Short circuit current ; Quantum efficiency
• 刊名：Current Applied Physics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：17
• 期：1
• 页码：47-54
• 全文大小：1533 K
• 卷排序：17

文摘

CdTe solar cell has low efficiency due to the blue-wave light absorption by CdS and Cu contamination by Cu back contact. This paper systematically investigated by apply ZnO buffer in combination of thinner CdS layer and applying Cu solution back contact method. First, the short-circuit current was improved from 21.7 to 25.1 mA/cm2 by the thinner CdS while the open-circuit voltage was maintained as before by the ZnO buffer layer as the increase of blue response in the QE curve. The short-circuit current was further improved from 25.1 to 26.1 mA/cm2 by applying Cu solution contact in replacement of the Cu metal contact as the increase of the red response in the QE curve. As result, the cell efficiency was improved from 12 to 15% without antireflective coating. The physics behind the improvement of the short-circuit current was discussed in the paper.