Mixing Behavior in Small Molecule: Fullerene Organic Photovoltaics [On the Mixing Behavior in Small Molecule: Fullerene Organic Photovoltaics]

Oosterhout, Stefan D.; Savikhin, Victoria; Zhang, Junxiang; Zhang, Yadong; Burgers, Mark A.; Marder, Seth R.; Bazan, Guillermo C.; Toney, Michael F.

doi:10.1021/acs.chemmater.7b00067

Title: Mixing Behavior in Small Molecule: Fullerene Organic Photovoltaics [On the Mixing Behavior in Small Molecule: Fullerene Organic Photovoltaics]

Journal Article · Wed Feb 22 00:00:00 EST 2017 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.7b00067· OSTI ID:1361065

^[1]; Savikhin, Victoria ^[2]; Zhang, Junxiang ^[3]; Zhang, Yadong ^[3]; Burgers, Mark A. ^[4];

^[3];

^[4]; Toney, Michael F. ^[1]

SLAC National Accelerator Lab., Menlo Park, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
Georgia Inst. of Technology, Atlanta, GA (United States)
Univ. of California, Santa Barbara, CA (United States)

Here, we report a novel method to determine the amount of pure, aggregated phase of donor and acceptor in organic photovoltaic (OPV) bulk heterojunctions. By determination of the diffraction intensity per unit volume for both donor and acceptor, the volume content of pure, aggregated donor and acceptor in the blend can be determined. We find that for the small molecule X2:[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) system, in contrast to most polymer systems, all the PCBM is aggregated, indicating there is negligible miscibility of PCBM with X2. This provides an explanation why the performance of OPV devices of X2:PCBM are high over a large range of PCBM concentrations. This is in contrast to many other OPV blends, where PCBM forms a mixed phase with the donor and does not provide sufficient transport for electrons when the PCBM concentration is low. This study demonstrates that a mixed phase is not necessarily a requirement for good OPV device performance.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515; N00014-14-1-0580; N00014-14-1-0711

OSTI ID:: 1361065

Journal Information:: Chemistry of Materials, Vol. 29, Issue 7; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 81 works

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