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Na 도핑된 ZnTe 후면전극을 이용한 CdTe 태양전지의 안정성 개선에 관한 연구
차은석(Eun Seok Cha),박규찬(Kyu Charn Park),안병태(Byung Tae Ahn) 한국태양광발전학회 2015 Current Photovoltaic Research Vol.3 No.1
Cu doping by copper or Cu₂Te materials enhances p+ formation in CdTe near the back contact interface, allowing better formation of ohmic contact. However, the Cu in CdTe junction is also considered as a principal component of CdTe cell degradation. In this paper, Na-doped ZnTe layer was employed as a back contact material to improve the stability of CdTe solar cells. As a process variable, post CdCl₂ treatment of CdS/CdTe film was conducted before or after depositing ZnTe:Na on CdTe. The change of the photovoltaic properties of CdTe cells were investigated with aging time. Low-temperature photoluminescence analysis was conducted to describe the degradation mechanism. The result showed that the CdTe solar cells with better stability compare to Cu contact were achieved using an optimized ZnTe:Na back contact.