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Effects of Overnight Oxidation on Perovskite Solar Cells with Co(III)TFSI Co-Doped Spiro-OMeTAD

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  • Laxmi Nakka

    (Solar Energy Research Institute of Singapore (SERIS), National University of Singapore, Singapore 117574, Singapore
    Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore)

  • Armin Gerhard Aberle

    (Solar Energy Research Institute of Singapore (SERIS), National University of Singapore, Singapore 117574, Singapore
    Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore)

  • Fen Lin

    (Solar Energy Research Institute of Singapore (SERIS), National University of Singapore, Singapore 117574, Singapore)

Abstract

Metal-halide perovskite solar cells (PSCs) have achieved remarkable power conversion efficiencies in recent years, and spiro-OMeTAD plays a significant role as a hole transport material in PSCs with record efficiencies. However, further studies and systematic experimental procedures on doped spiro-OMeTAD are required to enable a reliable process for potential commercialization. In particular, the effect of the prolonged oxidation of Co(III)TFSI co-doped spiro-OMeTAD has been one of the unanswered topics in PSC research. In this work, we investigate the influence of overnight oxidation on the performance of PSCs with Co(III)TFSI co-doped spiro-OMeTAD. Co-doping spiro-OMeTAD with Co(III) complexes instantly oxidizes spiro-OMeTAD, leading to an improvement in power conversion efficiency (PCE) from 13.1% (LiTFSI-doped spiro-OMeTAD) to 17.6% (LiTFSI + Co(III)TFSI-doped spiro-OMeTAD). It is found that PSCs with spiro-OMeTAD co-doped with Co(III)TFSI without overnight oxidation could retain around 90% of the efficiency under maximum power point tracking at 1-sun illumination for 3000 min, whereas the efficiencies drop by more than 30% when Co(III)TFSI co-doped spiro-OMeTAD is exposed to overnight oxidation. Hence, it is important to inhibit the unnecessary overnight oxidation of Co(III)TFSI co-doped spiro-OMeTAD so as to save excess fabrication time and overcome the poor stability issues.

Suggested Citation

  • Laxmi Nakka & Armin Gerhard Aberle & Fen Lin, 2022. "Effects of Overnight Oxidation on Perovskite Solar Cells with Co(III)TFSI Co-Doped Spiro-OMeTAD," Energies, MDPI, vol. 16(1), pages 1-11, December.
    • Handle: RePEc:gam:jeners:v:16:y:2022:i:1:p:354-:d:1018079
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    References listed on IDEAS

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    1. Nam Joong Jeon & Hyejin Na & Eui Hyuk Jung & Tae-Youl Yang & Yong Guk Lee & Geunjin Kim & Hee-Won Shin & Sang Seok & Jaemin Lee & Jangwon Seo, 2018. "A fluorene-terminated hole-transporting material for highly efficient and stable perovskite solar cells," Nature Energy, Nature, vol. 3(8), pages 682-689, August.
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