Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Improvement of Short-Circuit Current of Quantum Dot Sensitive Solar Cell Through Various Size of Quantum Dots

양자점 입도제어를 통한 양자점 감응형 태양전지 단락전류 향상

  • Ji, Seung Hwan (Department of Energy Engineering, Dankook University) ;
  • Yun, Hye Won (Department of Energy Engineering, Dankook University) ;
  • Lee, Jin Ho (Department of Energy Engineering, Dankook University) ;
  • Kim, Bum-Sung (Korea Institute for Rare Metals, Korea Institute of Industrial Technology) ;
  • Kim, Woo-Byoung (Department of Energy Engineering, Dankook University)
  • 지승환 (단국대학교 에너지공학과) ;
  • 윤혜원 (단국대학교 에너지공학과) ;
  • 이진호 (단국대학교 에너지공학과) ;
  • 김범성 (한국생산기술연구원 한국희소금속산업기술센터) ;
  • 김우병 (단국대학교 에너지공학과)
  • Received : 2020.11.02
  • Accepted : 2020.12.08
  • Published : 2021.01.27
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Abstract

In this study, quantum dot-sensitized solar cells (QDSSC) using CdSe/ZnS quantum dots (QD) of various sizes with green, yellow, and red colors are developed. Quantum dots, depending their different sizes, have advantages of absorbing light of various wavelengths. This absorption of light of various wavelengths increases the photocurrent production of solar cells. The absorption and emission peaks and excellent photochemical properties of the synthesized quantum dots are confirmed through UV-visible and photoluminescence (PL) analysis. In TEM analysis, the average sizes of individual green, yellow, and red quantum dots are shown to be 5 nm, 6 nm, and 8 nm. The J-V curves of QDSSC for one type of QD show a current density of 1.7 mA/㎠ and an open-circuit voltage of 0.49 V, while QDSSC using three type of QDs shows improved electrical characteristics of 5.52 mA/㎠ and 0.52 V. As a result, the photoelectric conversion efficiency of QDSSC using one type of QD is as low as 0.53 %, but QDSSC using three type of QDs has a measured efficiency of 1.4 %.

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References

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