High seebeck coefficient and power factor in n-type organic thermoelectrics
The n-type thermoelectric properties of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) are investigated for different solution-based doping methods. A novel inverse-sequential doping method where the semiconductor (PCBM) is deposited on a previously cast dopant 4-(1,3-dimethyl-2,3-dihydro-1H-benz...
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| Hauptverfasser: | , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2018
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| In: |
Advanced electronic materials
Year: 2017, Jahrgang: 4, Heft: 1 |
| ISSN: | 2199-160X |
| DOI: | 10.1002/aelm.201700501 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1002/aelm.201700501 Verlag, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/aelm.201700501 
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| Verfasserangaben: | Guangzheng Zuo, Zhaojun Li, Ergang Wang, and Martijn Kemerink |
| Zusammenfassung: | The n-type thermoelectric properties of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) are investigated for different solution-based doping methods. A novel inverse-sequential doping method where the semiconductor (PCBM) is deposited on a previously cast dopant 4-(1,3-dimethyl-2,3-dihydro-1H-benzoimidazol-2-yl)-N,N-diphenylaniline film to achieve a very high power factor PF ≈ 35 µW m−1 K−2 with a conductivity σ ≈ 40 S m−1 is introduced. It is also shown that n-type organic semiconductors obey the −1/4 power law relation between Seebeck coefficient S and σ that are previously found for p-type materials. An analytical model on basis of variable range hopping unifies these results. The power law for n-type materials is shifted toward higher conductivities by two orders of magnitude with respect to that of p-type, suggesting strongly that n-type organic semiconductors can eventually become superior to their p-type counterparts. Adding a small fraction lower lowest unoccupied molecular orbital material (core-cyanated naphthalene diimide) into PCBM leads to a higher S for inverse-sequential doping but not for bulk doping due to different morphologies. |
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| Beschreibung: | First published: 21 December 2017 Gesehen am 27.11.2019 |
| Beschreibung: | Online Resource |
| ISSN: | 2199-160X |
| DOI: | 10.1002/aelm.201700501 |