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Title: Enhancement in Organic Photovoltaic Efficiency through the Synergistic Interplay of Molecular Donor Hydrogen Bonding and -Stacking

Abstract

For organic photovoltaic (OPV) cells based on the bulk heterojunction (BHJ) structure, it remains challenging to rationally control the degree of phase separation and percolation within blends of donors and acceptors to secure optimal charge separation and transport. Reported is a bottom-up, supramolecular approach to BHJ OPVs wherein tailored hydrogen bonding (H-bonding) interactions between π-conjugated electron donor molecules encourage formation of vertically aligned donor π-stacks while simultaneously suppressing lateral aggregation; the programmed arrangement facilitates fine mixing with fullerene acceptors and efficient charge transport. The approach is illustrated using conventional linear or branched quaterthiophene donor chromophores outfitted with terminal functional groups that are either capable or incapable of self-complementary H-bonding. When applied to OPVs, the H-bond capable donors yield a twofold enhancement in power conversion efficiency relative to the comparator systems, with a maximum external quantum efficiency of 64%. H-bond promoted assembly results in redshifted absorption (in neat films and donor:C 60 blends) and enhanced charge collection efficiency despite disparate donor chromophore structure. Both features positively impact photocurrent and fill factor in OPV devices. Film structural characterization by atomic force microscopy, transmission electron microscopy, and grazing incidence wide angle X-ray scattering reveals a synergistic interplay of lateral H-bonding interactions and verticalmore » π-stacking for directing the favorable morphology of the BHJ.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [1];  [1];  [1]
  1. Univ. of Florida, Gainesville, FL (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1286904
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Advanced Functional Materials
Additional Journal Information:
Journal Volume: 25; Journal Issue: 32; Journal ID: ISSN 1616-301X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY

Citation Formats

Shewmon, Nathan, Watkins, Davita, Galindo, Johan, Zerdan, Raghida, Chen, Jihua, Keum, Jong Kahk, Roitberg, Adrian, Xue, Jiangeng, and Castellano, Ronald. Enhancement in Organic Photovoltaic Efficiency through the Synergistic Interplay of Molecular Donor Hydrogen Bonding and -Stacking. United States: N. p., 2015. Web. doi:10.1002/adfm.201501815.
Shewmon, Nathan, Watkins, Davita, Galindo, Johan, Zerdan, Raghida, Chen, Jihua, Keum, Jong Kahk, Roitberg, Adrian, Xue, Jiangeng, & Castellano, Ronald. Enhancement in Organic Photovoltaic Efficiency through the Synergistic Interplay of Molecular Donor Hydrogen Bonding and -Stacking. United States. doi:10.1002/adfm.201501815.
Shewmon, Nathan, Watkins, Davita, Galindo, Johan, Zerdan, Raghida, Chen, Jihua, Keum, Jong Kahk, Roitberg, Adrian, Xue, Jiangeng, and Castellano, Ronald. Mon . "Enhancement in Organic Photovoltaic Efficiency through the Synergistic Interplay of Molecular Donor Hydrogen Bonding and -Stacking". United States. doi:10.1002/adfm.201501815. https://www.osti.gov/servlets/purl/1286904.
@article{osti_1286904,
title = {Enhancement in Organic Photovoltaic Efficiency through the Synergistic Interplay of Molecular Donor Hydrogen Bonding and -Stacking},
author = {Shewmon, Nathan and Watkins, Davita and Galindo, Johan and Zerdan, Raghida and Chen, Jihua and Keum, Jong Kahk and Roitberg, Adrian and Xue, Jiangeng and Castellano, Ronald},
abstractNote = {For organic photovoltaic (OPV) cells based on the bulk heterojunction (BHJ) structure, it remains challenging to rationally control the degree of phase separation and percolation within blends of donors and acceptors to secure optimal charge separation and transport. Reported is a bottom-up, supramolecular approach to BHJ OPVs wherein tailored hydrogen bonding (H-bonding) interactions between π-conjugated electron donor molecules encourage formation of vertically aligned donor π-stacks while simultaneously suppressing lateral aggregation; the programmed arrangement facilitates fine mixing with fullerene acceptors and efficient charge transport. The approach is illustrated using conventional linear or branched quaterthiophene donor chromophores outfitted with terminal functional groups that are either capable or incapable of self-complementary H-bonding. When applied to OPVs, the H-bond capable donors yield a twofold enhancement in power conversion efficiency relative to the comparator systems, with a maximum external quantum efficiency of 64%. H-bond promoted assembly results in redshifted absorption (in neat films and donor:C 60 blends) and enhanced charge collection efficiency despite disparate donor chromophore structure. Both features positively impact photocurrent and fill factor in OPV devices. Film structural characterization by atomic force microscopy, transmission electron microscopy, and grazing incidence wide angle X-ray scattering reveals a synergistic interplay of lateral H-bonding interactions and vertical π-stacking for directing the favorable morphology of the BHJ.},
doi = {10.1002/adfm.201501815},
journal = {Advanced Functional Materials},
number = 32,
volume = 25,
place = {United States},
year = {Mon Jul 20 00:00:00 EDT 2015},
month = {Mon Jul 20 00:00:00 EDT 2015}
}

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Cited by: 6 works
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Works referenced in this record:

Polymer solar cells with enhanced open-circuit voltage and efficiency
journal, November 2009

  • Chen, Hsiang-Yu; Hou, Jianhui; Zhang, Shaoqing
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Size analysis of single fullerene molecules by electron microscopy
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