Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells
The microstructure and photophysics of low-band gap, all-polymer photovoltaic blends are presented. Blends are based on the donor polymer BFS4 (a dithienyl-benzo[1,2-b:4,5-b]dithiophene/5-fluoro-2,1,3-benzothiadiazole co-polymer) paired with the naphthalene diimide-based acceptor polymer P(NDI2OD-T2...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal Article |
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Royal Society of Chemistry
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/43844 |
| _version_ | 1848756824975605760 |
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| author | Deshmukh, K. Qin, T. Gallaher, J. Liu, A. Gann, E. O'Donnell, Kane Thomsen, L. Hodgkiss, J. Watkins, S. McNeill, C. |
| author_facet | Deshmukh, K. Qin, T. Gallaher, J. Liu, A. Gann, E. O'Donnell, Kane Thomsen, L. Hodgkiss, J. Watkins, S. McNeill, C. |
| author_sort | Deshmukh, K. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The microstructure and photophysics of low-band gap, all-polymer photovoltaic blends are presented. Blends are based on the donor polymer BFS4 (a dithienyl-benzo[1,2-b:4,5-b]dithiophene/5-fluoro-2,1,3-benzothiadiazole co-polymer) paired with the naphthalene diimide-based acceptor polymer P(NDI2OD-T2). Efficiencies of over 4% are demonstrated, with an open circuit voltage of greater than 0.9 V achieved. Transmission electron microscopy reveals a relatively coarse phase-separated morphology, with elongated domains up to 200 nm in width. Near-edge X-ray absorption fine-structure (NEXAFS) spectroscopy and atomic force microscopy (AFM) measurements reveal that the top surface of BFS4:P(NDI2OD-T2) blends is covered with a pure BFS4 capping layer. Depth profiling measurements confirm this vertical phase separation with a surface-directed spinodal decomposition wave observed. Grazing-incidence wide-angle X-ray scattering (GIWAXS) measurements confirm that BFS4 and P(NDI2OD-T2) are semicrystalline with both polymers retaining their semicrystalline nature when blended. Photoluminescence spectroscopy reveals incomplete photoluminescence quenching with as much as 30% of excitons failing to reach a donor/acceptor interface. Transient absorption spectroscopy measurements also find evidence for rapid geminate recombination. |
| first_indexed | 2025-11-14T09:18:21Z |
| format | Journal Article |
| id | curtin-20.500.11937-43844 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:18:21Z |
| publishDate | 2015 |
| publisher | Royal Society of Chemistry |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-438442017-09-13T13:42:26Z Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells Deshmukh, K. Qin, T. Gallaher, J. Liu, A. Gann, E. O'Donnell, Kane Thomsen, L. Hodgkiss, J. Watkins, S. McNeill, C. The microstructure and photophysics of low-band gap, all-polymer photovoltaic blends are presented. Blends are based on the donor polymer BFS4 (a dithienyl-benzo[1,2-b:4,5-b]dithiophene/5-fluoro-2,1,3-benzothiadiazole co-polymer) paired with the naphthalene diimide-based acceptor polymer P(NDI2OD-T2). Efficiencies of over 4% are demonstrated, with an open circuit voltage of greater than 0.9 V achieved. Transmission electron microscopy reveals a relatively coarse phase-separated morphology, with elongated domains up to 200 nm in width. Near-edge X-ray absorption fine-structure (NEXAFS) spectroscopy and atomic force microscopy (AFM) measurements reveal that the top surface of BFS4:P(NDI2OD-T2) blends is covered with a pure BFS4 capping layer. Depth profiling measurements confirm this vertical phase separation with a surface-directed spinodal decomposition wave observed. Grazing-incidence wide-angle X-ray scattering (GIWAXS) measurements confirm that BFS4 and P(NDI2OD-T2) are semicrystalline with both polymers retaining their semicrystalline nature when blended. Photoluminescence spectroscopy reveals incomplete photoluminescence quenching with as much as 30% of excitons failing to reach a donor/acceptor interface. Transient absorption spectroscopy measurements also find evidence for rapid geminate recombination. 2015 Journal Article http://hdl.handle.net/20.500.11937/43844 10.1039/c4ee03059a Royal Society of Chemistry restricted |
| spellingShingle | Deshmukh, K. Qin, T. Gallaher, J. Liu, A. Gann, E. O'Donnell, Kane Thomsen, L. Hodgkiss, J. Watkins, S. McNeill, C. Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells |
| title | Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells |
| title_full | Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells |
| title_fullStr | Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells |
| title_full_unstemmed | Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells |
| title_short | Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells |
| title_sort | performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells |
| url | http://hdl.handle.net/20.500.11937/43844 |