Current Photovoltaic Research

  • 제13권3호
  • /
  • Pages.126-131
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  • 2025
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  • 2288-3274(pISSN)
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  • 2508-125X(eISSN)
한국태양광발전학회 (Korea Photovoltaic Society)
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The Passivation Effect on Perovskite Solar Cells Using Single-Molecular Additives with Double Carboxylic Ester Groups

  • 남정석 (성균나노과학기술원 (SAINT), 성균관대학교) ;
  • 이강혁 (미래에너지공학과, 성균관대학교) ;
  • 김민아 (성균나노과학기술원 (SAINT), 성균관대학교) ;
  • ;
  • 전일 (성균나노과학기술원 (SAINT), 성균관대학교)
  • Jeong-Seok Nam (SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU)) ;
  • Kanghyeok Lee (Department of Future Energy Engineering (DFEE), Sungkyunkwan University (SKKU)) ;
  • Mina Kim (SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU)) ;
  • Tian Ying (SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU)) ;
  • Il Jeon (SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU))
  • 투고 : 2025.05.09
  • 심사 : 2025.09.12
  • 발행 : 2025.09.30
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초록

In this study, a di-carboxylic ester additive with a symmetric structure was introduced into perovskite solar cells, and the resulting changes in the optoelectronic properties of the devices were investigated. NMR and DFT analyses revealed that the synthesized additive possesses a nonpolar benzene ring, which is expected to facilitate favorable stacking characteristics. Upon incorporation of this additive, PCE of the devices improved from 10.48% to 11.66%. However, FF decreased from 68.27% to 64.37%. Further analyses, including dark current measurements, light-intensity-dependent current-voltage characteristics, and SCLC fitting, indicated that the additive effectively reduces trap states not only in the perovskite absorber layer but also in the PEDOT:PSS hole transport layer. Therefore, the reduction in FF appears to be attributed not to the formation of traps but rather to a mismatch between the perovskite hole energy level and the elevated quasi-Fermi level of holes in the HTL induced by trap-state reduction. These findings suggest that the additive may exert additional effects, which warrant further investigation.

키워드

과제정보

The authors gratefully acknowledge the Japan Society for the Promotion of Science (JSPS) KAKENHI (grant no. JP23K04872). This work was supported by the National Research Foundation of Korea (NRF), funded by the Ministry of Science and ICT (MSIT) of the Korean government (2023R1A2C3007358).

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