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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 PC 70BM and the bistrifluoromethylfullerene 1,7-C 60(CF 3) 2. For both the polymer and small molecule blends, C 60(CF 3) 2 stabilizes the initial rate of photobleaching by a factor of 15 relative to PC70BM. However, once the small molecule:C 60(CF 3) 2 blend bleaches to ~80% of its initial optical density, the rate of photobleaching dramatically accelerates, which is not observed in the analagous polymer blend. We probe that phenomenon using time-resovled photoluminescence (TRPL) to measure PL quenching efficiencies at defined intervals during the photobleaching experiments. The data indicates the small molecule donor and C 60(CF 3) 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.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [3];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Indian Inst. of Science, Bangalore (India)
  3. Colorado State Univ., Fort Collins, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1424579
Report Number(s):
NREL/JA-5900-70695
Journal ID: ISSN 2050-7488; JMCAET; TRN: US1801925
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 6; Journal Issue: 11; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; organic photovoltaics; donor materials; OPV

Citation Formats

Garner, Logan E., Nellissery Viswanathan, Vinila, Arias, Dylan H., Brook, Colin P., Christensen, Steven T., Ferguson, Andrew J., Kopidakis, Nikos, Larson, Bryon W., Owczarczyk, Zbyslaw R., Pfeilsticker, Jason R., Ramamurthy, Praveen C., Strauss, Steven H., Boltalina, Olga V., and Braunecker, Wade A.. Photobleaching dynamics in small molecule vs.  polymer organic photovoltaic blends with 1,7-bis-trifluoromethylfullerene. United States: N. p., 2018. Web. doi:10.1039/C7TA10995D.
Garner, Logan E., Nellissery Viswanathan, Vinila, Arias, Dylan H., Brook, Colin P., Christensen, Steven T., Ferguson, Andrew J., Kopidakis, Nikos, Larson, Bryon W., Owczarczyk, Zbyslaw R., Pfeilsticker, Jason R., Ramamurthy, Praveen C., Strauss, Steven H., Boltalina, Olga V., & Braunecker, Wade A.. Photobleaching dynamics in small molecule vs.  polymer organic photovoltaic blends with 1,7-bis-trifluoromethylfullerene. United States. doi:10.1039/C7TA10995D.
Garner, Logan E., Nellissery Viswanathan, Vinila, Arias, Dylan H., Brook, Colin P., Christensen, Steven T., Ferguson, Andrew J., Kopidakis, Nikos, Larson, Bryon W., Owczarczyk, Zbyslaw R., Pfeilsticker, Jason R., Ramamurthy, Praveen C., Strauss, Steven H., Boltalina, Olga V., and Braunecker, Wade A.. Tue . "Photobleaching dynamics in small molecule vs.  polymer organic photovoltaic blends with 1,7-bis-trifluoromethylfullerene". United States. doi:10.1039/C7TA10995D.
@article{osti_1424579,
title = {Photobleaching dynamics in small molecule vs.  polymer organic photovoltaic blends with 1,7-bis-trifluoromethylfullerene},
author = {Garner, Logan E. and Nellissery Viswanathan, Vinila and Arias, Dylan H. and Brook, Colin P. and Christensen, Steven T. and Ferguson, Andrew J. and Kopidakis, Nikos and Larson, Bryon W. and Owczarczyk, Zbyslaw R. and Pfeilsticker, Jason R. and Ramamurthy, Praveen C. and Strauss, Steven H. and Boltalina, Olga V. and Braunecker, Wade A.},
abstractNote = {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 bistrifluoromethylfullerene 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 analagous polymer blend. We probe that phenomenon using time-resovled 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.},
doi = {10.1039/C7TA10995D},
journal = {Journal of Materials Chemistry. A},
number = 11,
volume = 6,
place = {United States},
year = {Tue Feb 27 00:00:00 EST 2018},
month = {Tue Feb 27 00:00:00 EST 2018}
}

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