Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells

Kedar D. Deshmukh, Tianshi Qin, Joseph K. Gallaher, Amelia Chi Ying Liu, Eliot Gann, Kane Michael O'Donnell, Lars Thomsen, Justin M. Hodgkiss, Scott Edward Watkins, Christopher R. McNeill

Research output: Contribution to journalArticleResearchpeer-review

Abstract

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(NDI2ODT2). 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.
Original languageEnglish
Pages (from-to)332 - 342
Number of pages11
JournalEnergy & Environmental Science
Volume8
Issue number1
DOIs
Publication statusPublished - 2015

Cite this

Deshmukh, Kedar D. ; Qin, Tianshi ; Gallaher, Joseph K. ; Liu, Amelia Chi Ying ; Gann, Eliot ; O'Donnell, Kane Michael ; Thomsen, Lars ; Hodgkiss, Justin M. ; Watkins, Scott Edward ; McNeill, Christopher R. / Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells. In: Energy & Environmental Science. 2015 ; Vol. 8, No. 1. pp. 332 - 342.
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title = "Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells",
abstract = "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(NDI2ODT2). 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.",
author = "Deshmukh, {Kedar D.} and Tianshi Qin and Gallaher, {Joseph K.} and Liu, {Amelia Chi Ying} and Eliot Gann and O'Donnell, {Kane Michael} and Lars Thomsen and Hodgkiss, {Justin M.} and Watkins, {Scott Edward} and McNeill, {Christopher R.}",
year = "2015",
doi = "10.1039/c4ee03059a",
language = "English",
volume = "8",
pages = "332 -- 342",
journal = "Energy & Environmental Science",
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Deshmukh, KD, Qin, T, Gallaher, JK, Liu, ACY, Gann, E, O'Donnell, KM, Thomsen, L, Hodgkiss, JM, Watkins, SE & McNeill, CR 2015, 'Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells' Energy & Environmental Science, vol. 8, no. 1, pp. 332 - 342. https://doi.org/10.1039/c4ee03059a

Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells. / Deshmukh, Kedar D. ; Qin, Tianshi; Gallaher, Joseph K.; Liu, Amelia Chi Ying; Gann, Eliot; O'Donnell, Kane Michael; Thomsen, Lars; Hodgkiss, Justin M. ; Watkins, Scott Edward; McNeill, Christopher R.

In: Energy & Environmental Science, Vol. 8, No. 1, 2015, p. 332 - 342.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells

AU - Deshmukh, Kedar D.

AU - Qin, Tianshi

AU - Gallaher, Joseph K.

AU - Liu, Amelia Chi Ying

AU - Gann, Eliot

AU - O'Donnell, Kane Michael

AU - Thomsen, Lars

AU - Hodgkiss, Justin M.

AU - Watkins, Scott Edward

AU - McNeill, Christopher R.

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N2 - 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(NDI2ODT2). 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.

AB - 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(NDI2ODT2). 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.

UR - http://goo.gl/GPJS45

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JO - Energy & Environmental Science

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