- Low donor content solar cells are an intriguing class of photovoltaic device about which there is still considerable discussion with respect to their mode of operation. We have synthesized a series of triphenylamine-based materials for use in low donor content devices with the electron accepting [6,6]-phenyl-C71-butyric acid methyl ester (PC(7)0BM). The triphenylamine-based materials absorb light in the near UV enabling the PC(7)0BM to be be the main light absorbing organic semiconducting material in the solar cell. It was found that the devices did not operate as classical Schottky junctions but rather photocurrent was generated by hole transfer from the photo-excited PC(7)0BM to the triphenylamine-based donors. We found that replacing the methoxy surface groups with methyl groups on the donor material led to a decrease in hole mobility for the neat films, which was due to the methyl substituted materials having the propensity to aggregate. The thermodynamic drive to aggregate was advantageous for the performance of the low donorLow donor content solar cells are an intriguing class of photovoltaic device about which there is still considerable discussion with respect to their mode of operation. We have synthesized a series of triphenylamine-based materials for use in low donor content devices with the electron accepting [6,6]-phenyl-C71-butyric acid methyl ester (PC(7)0BM). The triphenylamine-based materials absorb light in the near UV enabling the PC(7)0BM to be be the main light absorbing organic semiconducting material in the solar cell. It was found that the devices did not operate as classical Schottky junctions but rather photocurrent was generated by hole transfer from the photo-excited PC(7)0BM to the triphenylamine-based donors. We found that replacing the methoxy surface groups with methyl groups on the donor material led to a decrease in hole mobility for the neat films, which was due to the methyl substituted materials having the propensity to aggregate. The thermodynamic drive to aggregate was advantageous for the performance of the low donor content (6 wt%) films. It was found that the 6 wt% donor devices generally gave higher performance than devices containing 50 wt% of the donor.…
Metadaten| Author details: | Wei JiangORCiD, Chen TaoORCiD, Martin StolterfohtORCiD, Hui Jin, Meera Stephen, Qianqian LinORCiD, Ravi C. R. Nagiri, Paul L. Burn, Ian R. Gentle |
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| DOI: | https://doi.org/10.1016/j.orgel.2019.105480 |
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| ISSN: | 1566-1199 |
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| ISSN: | 1878-5530 |
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| Title of parent work (English): | Organic electronics : physics, materials and applications |
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| Subtitle (English): | charge transport and device performance |
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| Publisher: | Elsevier |
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| Place of publishing: | Amsterdam |
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| Publication type: | Article |
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| Language: | English |
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| Date of first publication: | 2020/01/01 |
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| Publication year: | 2020 |
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| Release date: | 2023/04/19 |
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| Tag: | Schottky junction; hole; low donor content; mobility; photocurrent generation; photoexcited hole transfer; synthesis |
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| Volume: | 76 |
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| Article number: | 105480 |
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| Number of pages: | 7 |
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| Funding institution: | University of Queensland (Strategic Initiative -Centre for Organic; Photonics Electronics)University of Queensland; Australian Government; through the Australian Renewable Energy Agency (ARENA), Australian; Centre for Advanced Photovoltaics (ACAP)Australian Renewable Energy; Agency (ARENA) |
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| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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| DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
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| Peer review: | Referiert |
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| Publishing method: | Open Access / Bronze Open-Access |
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| License (German): |  Keine öffentliche Lizenz: Unter Urheberrechtsschutz |
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