Photobleaching Dynamics in Small Molecule vs. Polymer Organic Photovoltaic Blends with 1,7-Bis-Trifluoromethylfullerene

Wade Braunecker; Steven Christensen; Andrew Ferguson; Nikos Kopidakis; Bryon Larson; Zbyslaw Owczarczyk; Jason Pfeilsticker; Vinila Viswanathan; Colin Brook; Praveen Ramamurthy; Steven Strauss; Olga Boltalina; Logan Garner; Dylan Arias

doi:10.1039/C7TA10995D

Photobleaching Dynamics in Small Molecule vs. Polymer Organic Photovoltaic Blends with 1,7-Bis-Trifluoromethylfullerene

Wade Braunecker, Steven Christensen, Andrew Ferguson, Nikos Kopidakis, Bryon Larson, Zbyslaw Owczarczyk, Jason Pfeilsticker, Vinila Viswanathan, Colin Brook, Praveen Ramamurthy, Steven Strauss, Olga Boltalina, Logan Garner, Dylan Arias

Research output: Contribution to journal › Article › peer-review

17 Scopus Citations

Abstract

Two organic photovoltaic (OPV) donor materials (one polymer and one small molecule) are synthesized from the same constituent building blocks, namely thiophene units, cyclopentathiophene dione (CTD), and cyclopentadithiophene (CPDT). Photobleaching dynamics of these donor materials are then studied under white light illumination in air with blends of PC₇₀BM and the bis-trifluoromethylfullerene 1,7-C₆₀(CF₃)₂. For both the polymer and small molecule blends, C₆₀(CF₃)₂ stabilizes the initial rate of photobleaching by a factor of 15 relative to PC₇₀BM. However, once the small molecule:C₆₀(CF₃)₂ blend bleaches to ∼80% of its initial optical density, the rate of photobleaching dramatically accelerates, which is not observed in the analogous polymer blend. We probe that phenomenon using time-resolved photoluminescence (TRPL) to measure PL quenching efficiencies at defined intervals during the photobleaching experiments. The data indicates the small molecule donor and C₆₀(CF₃)₂ acceptor significantly de-mix with time, after which the blend begins to bleach at approximately the same rate as the neat donor sample. The work suggests that perfluoroalkylfullerenes have great potential to stabilize certain OPV active layers toward photodegradation, provided their morphology is stable.

Original language	American English
Pages (from-to)	4623-4628
Number of pages	6
Journal	Journal of Materials Chemistry A
Volume	6
Issue number	11
DOIs	https://doi.org/10.1039/C7TA10995D https://doi.org/10.1039/c7ta10995d
State	Published - 2018

Bibliographical note

Publisher Copyright:
© 2018 The Royal Society of Chemistry.

NREL Publication Number

NREL/JA-5900-70695

Keywords

donor materials
OPV
organic photovoltaics

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Braunecker, W., Christensen, S., Ferguson, A., Kopidakis, N., Larson, B., Owczarczyk, Z., Pfeilsticker, J., Viswanathan, V., Brook, C., Ramamurthy, P., Strauss, S., Boltalina, O., Garner, L., & Arias, D. (2018). Photobleaching Dynamics in Small Molecule vs. Polymer Organic Photovoltaic Blends with 1,7-Bis-Trifluoromethylfullerene. Journal of Materials Chemistry A, 6(11), 4623-4628. https://doi.org/10.1039/C7TA10995D, https://doi.org/10.1039/c7ta10995d

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title = "Photobleaching Dynamics in Small Molecule vs. Polymer Organic Photovoltaic Blends with 1,7-Bis-Trifluoromethylfullerene",

abstract = "Two organic photovoltaic (OPV) donor materials (one polymer and one small molecule) are synthesized from the same constituent building blocks, namely thiophene units, cyclopentathiophene dione (CTD), and cyclopentadithiophene (CPDT). Photobleaching dynamics of these donor materials are then studied under white light illumination in air with blends of PC70BM and the bis-trifluoromethylfullerene 1,7-C60(CF3)2. For both the polymer and small molecule blends, C60(CF3)2 stabilizes the initial rate of photobleaching by a factor of 15 relative to PC70BM. However, once the small molecule:C60(CF3)2 blend bleaches to ∼80% of its initial optical density, the rate of photobleaching dramatically accelerates, which is not observed in the analogous polymer blend. We probe that phenomenon using time-resolved photoluminescence (TRPL) to measure PL quenching efficiencies at defined intervals during the photobleaching experiments. The data indicates the small molecule donor and C60(CF3)2 acceptor significantly de-mix with time, after which the blend begins to bleach at approximately the same rate as the neat donor sample. The work suggests that perfluoroalkylfullerenes have great potential to stabilize certain OPV active layers toward photodegradation, provided their morphology is stable.",

keywords = "donor materials, OPV, organic photovoltaics",

author = "Wade Braunecker and Steven Christensen and Andrew Ferguson and Nikos Kopidakis and Bryon Larson and Zbyslaw Owczarczyk and Jason Pfeilsticker and Vinila Viswanathan and Colin Brook and Praveen Ramamurthy and Steven Strauss and Olga Boltalina and Logan Garner and Dylan Arias",

note = "Publisher Copyright: {\textcopyright} 2018 The Royal Society of Chemistry.",

year = "2018",

doi = "10.1039/C7TA10995D",

language = "American English",

volume = "6",

pages = "4623--4628",

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Braunecker, W, Christensen, S, Ferguson, A , Kopidakis, N , Larson, B , Owczarczyk, Z, Pfeilsticker, J, Viswanathan, V, Brook, C, Ramamurthy, P, Strauss, S, Boltalina, O, Garner, L & Arias, D 2018, 'Photobleaching Dynamics in Small Molecule vs. Polymer Organic Photovoltaic Blends with 1,7-Bis-Trifluoromethylfullerene', Journal of Materials Chemistry A, vol. 6, no. 11, pp. 4623-4628. https://doi.org/10.1039/C7TA10995D, https://doi.org/10.1039/c7ta10995d

TY - JOUR

T1 - Photobleaching Dynamics in Small Molecule vs. Polymer Organic Photovoltaic Blends with 1,7-Bis-Trifluoromethylfullerene

AU - Braunecker, Wade

AU - Christensen, Steven

AU - Ferguson, Andrew

AU - Kopidakis, Nikos

AU - Larson, Bryon

AU - Owczarczyk, Zbyslaw

AU - Pfeilsticker, Jason

AU - Viswanathan, Vinila

AU - Brook, Colin

AU - Ramamurthy, Praveen

AU - Strauss, Steven

AU - Boltalina, Olga

AU - Garner, Logan

AU - Arias, Dylan

PY - 2018

Y1 - 2018

N2 - Two organic photovoltaic (OPV) donor materials (one polymer and one small molecule) are synthesized from the same constituent building blocks, namely thiophene units, cyclopentathiophene dione (CTD), and cyclopentadithiophene (CPDT). Photobleaching dynamics of these donor materials are then studied under white light illumination in air with blends of PC70BM and the bis-trifluoromethylfullerene 1,7-C60(CF3)2. For both the polymer and small molecule blends, C60(CF3)2 stabilizes the initial rate of photobleaching by a factor of 15 relative to PC70BM. However, once the small molecule:C60(CF3)2 blend bleaches to ∼80% of its initial optical density, the rate of photobleaching dramatically accelerates, which is not observed in the analogous polymer blend. We probe that phenomenon using time-resolved photoluminescence (TRPL) to measure PL quenching efficiencies at defined intervals during the photobleaching experiments. The data indicates the small molecule donor and C60(CF3)2 acceptor significantly de-mix with time, after which the blend begins to bleach at approximately the same rate as the neat donor sample. The work suggests that perfluoroalkylfullerenes have great potential to stabilize certain OPV active layers toward photodegradation, provided their morphology is stable.

AB - Two organic photovoltaic (OPV) donor materials (one polymer and one small molecule) are synthesized from the same constituent building blocks, namely thiophene units, cyclopentathiophene dione (CTD), and cyclopentadithiophene (CPDT). Photobleaching dynamics of these donor materials are then studied under white light illumination in air with blends of PC70BM and the bis-trifluoromethylfullerene 1,7-C60(CF3)2. For both the polymer and small molecule blends, C60(CF3)2 stabilizes the initial rate of photobleaching by a factor of 15 relative to PC70BM. However, once the small molecule:C60(CF3)2 blend bleaches to ∼80% of its initial optical density, the rate of photobleaching dramatically accelerates, which is not observed in the analogous polymer blend. We probe that phenomenon using time-resolved photoluminescence (TRPL) to measure PL quenching efficiencies at defined intervals during the photobleaching experiments. The data indicates the small molecule donor and C60(CF3)2 acceptor significantly de-mix with time, after which the blend begins to bleach at approximately the same rate as the neat donor sample. The work suggests that perfluoroalkylfullerenes have great potential to stabilize certain OPV active layers toward photodegradation, provided their morphology is stable.

KW - donor materials

KW - OPV

KW - organic photovoltaics

UR - http://www.scopus.com/inward/record.url?scp=85043766135&partnerID=8YFLogxK

U2 - 10.1039/C7TA10995D

DO - 10.1039/C7TA10995D

M3 - Article

AN - SCOPUS:85043766135

SN - 2050-7488

VL - 6

SP - 4623

EP - 4628

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 11

ER -

Photobleaching Dynamics in Small Molecule vs. Polymer Organic Photovoltaic Blends with 1,7-Bis-Trifluoromethylfullerene

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Keywords

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