본 논문에서는 Indium tin oxide (ITO) 투명전극의 성장온도($T_G$)가 Cu(In,Ga)$Se_2$ (CIGS) 박막태양전지에 미치는 영향을 살펴 보았다. ITO 박막은 radio-frequency magnetron sputtering을 이용하여 상온에서 $350^{\circ}C$까지의 다양한 $T_G$ 조건에서 i-ZnO/ glass와 i-ZnO/CdS/CIGS/Mo/glass 기판에 증착되었다. ITO의 비저항과 CdS/CIGS 계면 특성은 $T_G$에 크게 영향을 받았다. $T_G{\leq}200^{\circ}C$에서는 $T_G$가 증가할수록 ITO 저항이 감소하였고 이에 따른 series 저항 감소가 태양전지 성능 향상에 기여하였다. 하지만 $T_G$ > $200^{\circ}C$에서는 CdS 버퍼층의 Cd이 CIGS 층으로 확산되어 소자의 p-n 계면이 파괴되는 것을 발견하였다. $T_G=200^{\circ}C$에서 ITO를 증착한 CIGS 태양전지의 경우 가장 높은 광전변환효율을 보였다.
KSP Keywords
Indium Tin Oxide(ITO), Petri net(PN), Radio-frequency, i-ZnO
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