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JOINPoster Sessions
2024 KPS Spring Meeting
Wednesday-Friday, November 4-6, 2020; Virtual Conference
Session P1-ap.4: Organic electronics and photonics
1:00 PM-1:50 PM, Thursday, November 05, 2020
Room:
Chair:
Abstract: P1-ap.406 : Effect of temperature during stirring of P3HT:PCBM solution on organic photovoltaics
Presenter:
Kim Wonsik
(Department of Physics, Kangwon National University)
Author:
KIM Wonsik 1,2, OH Jaewon 1, CHOI Seungsun 1,2, SHIN Woojin 1,2, OH Hyesung 1, JUNG Sehyun 1, RYU Mee-Yi 1, LEE Hyun Bok *1,2
(1Department of Physics, Kangwon National University, 2Institute for Accelerator Science, Kangwon National University)
In bulk heterojunction organic photovoltaics (OPVs), a phase separation of donor and acceptor materials significantly affects the device performance. When depositing a light-absorbing layer by a solution process, the temperature during stirring of a solution changes the phase of donor-acceptor mixture. In particular, in OPVs with a poly(3-hexylthiophene-2,5-diyl) (P3HT) donor and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) acceptor, PCBM tends to be aggregated if supersaturated. Hence, to establish an efficient process in device fabrication, an understanding of phase separation and its effect on charge dissociation is highly important.
In this study, we investigated the changes in electrical and electronic properties in OPVs by temperature during stirring of a P3HT:PCBM solution. The significant changes in morphology and crystallinity with different stirring temperature of P3HT and PCBM were observed through optical microscope and X-ray diffraction (XRD) measurements. Accordingly, the power conversion efficiency of OPVs was remarkably varied. To figure out the origin of difference in device performance, photoluminescence spectroscopy, UV-visible spectroscopy, and X-ray photoelectron spectroscopy measurements were performed. The exciton and charge transport mechanisms were discussed based on the measured film properties.
In this study, we investigated the changes in electrical and electronic properties in OPVs by temperature during stirring of a P3HT:PCBM solution. The significant changes in morphology and crystallinity with different stirring temperature of P3HT and PCBM were observed through optical microscope and X-ray diffraction (XRD) measurements. Accordingly, the power conversion efficiency of OPVs was remarkably varied. To figure out the origin of difference in device performance, photoluminescence spectroscopy, UV-visible spectroscopy, and X-ray photoelectron spectroscopy measurements were performed. The exciton and charge transport mechanisms were discussed based on the measured film properties.
Keyword:
organic photovoltaics, PCBM aggregation, PL, XPS