한국진공학회:학술대회논문집 (Proceedings of the Korean Vacuum Society Conference)

한국진공학회 (The Korean Vacuum Society)
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Electroreflectance Study of CIGS Thin Film Solar Cells

  • Jo, Hyun-Jun (Daegu Gyeongbuk Institute of Science and Technology (DGIST)) ;
  • Jeon, Dong-Hwan (Daegu Gyeongbuk Institute of Science and Technology (DGIST)) ;
  • Ko, Byoung Soo (Daegu Gyeongbuk Institute of Science and Technology (DGIST)) ;
  • Sung, Shi-Joon (Daegu Gyeongbuk Institute of Science and Technology (DGIST)) ;
  • Bae, In-Ho (Department of physics, Yeungnam University) ;
  • Kim, Dae-Hwan (Daegu Gyeongbuk Institute of Science and Technology (DGIST))
  • 발행 : 2013.02.18
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초록

We have investigated the optical and electrical properties of the CIGS thin film solar cells by the electroreflectance (ER), photoreflectance (PR), photoluminescence (PL), and photocurrent (PC) spectroscopies at room temperature. The ER spectrum had two narrow signal regions and one broad signal region. We measured PL and PC to confirm the signals at low energy region (1.02~1.35 eV), so these signals are related to the CIGS thin film, and the high energy region (2.10~2.52 eV) is related to the CdS bandgap energy. The broad signal region (1.35~2.09 eV) is due to the internal electric field by the p-n junction from the comparison between PR and ER spectra, and we calculated the internal electric field by the p-n junction. In the high efficiency solar cell, the CdS signal of ER spectrum is narrower than the lower efficiency solar cells.

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