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

Abstract

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.

Authors:
ORCiD logo [1];  [2];  [3];  [3];  [4]; ORCiD logo [3]; ORCiD logo [4];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
  3. Georgia Inst. of Technology, Atlanta, GA (United States)
  4. Univ. of California, Santa Barbara, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1361065
Grant/Contract Number:  
AC02-76SF00515; N00014-14-1-0580; N00014-14-1-0711
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 29; Journal Issue: 7; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 14 SOLAR ENERGY

Citation Formats

Oosterhout, Stefan D., Savikhin, Victoria, Zhang, Junxiang, Zhang, Yadong, Burgers, Mark A., Marder, Seth R., Bazan, Guillermo C., and Toney, Michael F. Mixing Behavior in Small Molecule: Fullerene Organic Photovoltaics [On the Mixing Behavior in Small Molecule: Fullerene Organic Photovoltaics]. United States: N. p., 2017. Web. doi:10.1021/acs.chemmater.7b00067.
Oosterhout, Stefan D., Savikhin, Victoria, Zhang, Junxiang, Zhang, Yadong, Burgers, Mark A., Marder, Seth R., Bazan, Guillermo C., & Toney, Michael F. Mixing Behavior in Small Molecule: Fullerene Organic Photovoltaics [On the Mixing Behavior in Small Molecule: Fullerene Organic Photovoltaics]. United States. doi:10.1021/acs.chemmater.7b00067.
Oosterhout, Stefan D., Savikhin, Victoria, Zhang, Junxiang, Zhang, Yadong, Burgers, Mark A., Marder, Seth R., Bazan, Guillermo C., and Toney, Michael F. Wed . "Mixing Behavior in Small Molecule: Fullerene Organic Photovoltaics [On the Mixing Behavior in Small Molecule: Fullerene Organic Photovoltaics]". United States. doi:10.1021/acs.chemmater.7b00067. https://www.osti.gov/servlets/purl/1361065.
@article{osti_1361065,
title = {Mixing Behavior in Small Molecule: Fullerene Organic Photovoltaics [On the Mixing Behavior in Small Molecule: Fullerene Organic Photovoltaics]},
author = {Oosterhout, Stefan D. and Savikhin, Victoria and Zhang, Junxiang and Zhang, Yadong and Burgers, Mark A. and Marder, Seth R. and Bazan, Guillermo C. and Toney, Michael F.},
abstractNote = {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.},
doi = {10.1021/acs.chemmater.7b00067},
journal = {Chemistry of Materials},
number = 7,
volume = 29,
place = {United States},
year = {Wed Feb 22 00:00:00 EST 2017},
month = {Wed Feb 22 00:00:00 EST 2017}
}

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Cited by: 4 works
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