Fullerene-Based Triads with Controlled Alkyl Spacer Length as Photoactive Materials for Single-Component Organic Solar Cells
- Authors
- Lee, Young Woong; Yeop, Jiwoo; Lim, Hyojin; Park, Won-Woo; Joung, Joonyoung Francis; Park, Sungnam; Kwon, Oh-Hoon; Kim, Jin Young; Woo, Han Young
- Issue Date
- 15-9월-2021
- Publisher
- AMER CHEMICAL SOC
- Keywords
- fullerene-based triads; morphology; organic photovoltaics; organic solar cells; single-component organic solar cells
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.13, no.36, pp.43174 - 43185
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 13
- Number
- 36
- Start Page
- 43174
- End Page
- 43185
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/136352
- DOI
- 10.1021/acsami.1c14901
- ISSN
- 1944-8244
- Abstract
- Two kinds of dumbbell-shaped acceptor-donor-acceptor (A-D-A)-type triad single-component (SC) photovoltaic molecules based on a benzodithiophene-rhodanine (BDTRh) core and [6,6]-phenyl-C-61 butyric acid (PC(61)BA) termini, BDTRh-C-2-PC(61)BA and BDTRh-C-10-PC(61)BA, were synthesized by modulating the alkyl (C2 and C10) spacer lengths. Both SC photovoltaic structures had similar UV-vis spectra in solution, but BDTRh-C-10-PC(61)BA showed a significantly higher absorption coefficient as a thin film. In films, a more facile intermolecular photo-induced charge transfer was observed for BDTRh-C-10-PC(61)BA in the broad-band transient absorption measurements. BDTRh-C-10-PC(61)BA also exhibited a higher hole mobility (by 25 times) and less bimolecular recombination than BDTRh-C-2-PC(61)BA By plotting the normalized external quantum efficiency data, a higher charge-transfer state was measured for BDTRh-C-10-PC(61)BA, reducing its voltage loss. A higher power conversion efficiency of similar to 2% was obtained for BDTRh-C-10-PC(61)BA, showing higher open-circuit voltage, short-circuit current density, and fill factor than those of BDTRh-C-2-PC(61)BA devices. The different carrier dynamics, voltage loss, and optical and photoelectrical characteristics depending on the spacer length were interpreted in terms of the film morphology. The longer decyl spacer in BDTRh-C-10-PC(61)BA afforded a significantly enhanced intermolecular ordering of the p-type core compared to BDTRh-C-2-PC(61)BA, suggesting that the alkyl spacer length plays a critical role in controlling the intermolecular packing interaction.
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