Molecular insights into photostability of fluorinated organic photovoltaic blends: role of fullerene electron affinity and donor–acceptor miscibility

Brook, Colin P.; Paul, Goutam; Viswanathan, Vinila Nellissery; Satyanarayana, Sandeep; Panidhara, Kumar M.; Larson, Bryon W.; Ferguson, Andrew J.; Pal, Amlan J.; Ramamurthy, Praveen C.; Strauss, Steven H.; Boltalina, Olga V.; Braunecker, Wade A.

doi:10.1039/d0se00971g

Molecular insights into photostability of fluorinated organic photovoltaic blends: role of fullerene electron affinity and donor–acceptor miscibility

Journal Article · Fri Sep 25 00:00:00 EDT 2020 · Sustainable Energy & Fuels

DOI:https://doi.org/10.1039/d0se00971g· OSTI ID:1726020

^[1]; Paul, Goutam ^[2]; Viswanathan, Vinila Nellissery ^[3]; Satyanarayana, Sandeep ^[3]; Panidhara, Kumar M. ^[3]; ^[4]; ^[4]; ^[2]; Ramamurthy, Praveen C. ^[3]; ^[1]; ^[1]; ^[4]

Colorado State Univ., Fort Collins, CO (United States)
Indian Association for the Cultivation of Science, Kolkata (India)
Indian Inst. of Science, Bangalore (India)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

In this report, the photostability of certain organic photovoltaic (OPV) active layers was demonstrated to improve by as much as a factor of five under white light illumination in air with the use of 1,7-bis-trifluoromethylfullerene (C₆₀(CF₃)₂) as the acceptor in place of PC₆₀BM. However, the results were highly dependent on the structure and functionality within the donor material. Twelve combinations of active layer blends were studied, comprised of six different high-performance donor polymers (two fluorinated and four non-fluorinated donors) and two fullerene acceptors (PC₆₀BM and C₆₀(CF₃)₂). The relative rates of irreversible photobleaching of the active layer blends were found to correlate well with the electron affinity of the fullerene when the polymer and fullerene were well blended, but a full rationalization of the photobleaching data requires consideration of both the electron affinity of the fullerene as well as the relative miscibility of the polymer–fullerene components in the blend. Miscibility of those components was probed using a combination of time-resolved photoluminescence (TRPL) measurements and scanning tunneling microscopy (STM) imaging. The presence of fluorinated aromatic units in the donor materials tend to promote more intimate mixing with C₆₀(CF₃)₂ as compared to PC₆₀BM. The full results of these photobleaching studies and measurements of donor–acceptor miscibility, considered alongside additional photoconductance measurements and preliminary device work, provide new molecular optimization insights for improving the long-term stability of OPV active layers.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1726020

Alternate ID(s):: OSTI ID: 1668111

Report Number(s):: NREL/JA--5900-77221; MainId:26167; UUID:280861c9-4f53-4ade-b2e4-06c31b2f2d94; MainAdminID:14045

Journal Information:: Sustainable Energy & Fuels, Journal Name: Sustainable Energy & Fuels Journal Issue: 11 Vol. 4; ISSN 2398-4902

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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