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Title: Parallel bulk heterojunction photovoltaics based on all-conjugated block copolymer additives

Abstract

We demonstrated that the addition of block copolymers to binary donor–acceptor blends represents an effective approach to target equilibrium, co-continuous morphologies of interpenetrating donors and acceptors in our recent study. We report a study of the impact of all-conjugated poly(thieno[3,4-b]-thiophene-co-benzodithiophene)-b-polynaphthalene diimide (PTB7-b-PNDI) block copolymer additives on the electronic properties and photovoltaic performance of bulk heterojunction organic photovoltaic active layers comprised of a PTB7 donor and a phenyl-C61-butyric acid methyl ester (PCBM61) acceptor. We find that small amounts of BCP additives lead to improved performance due to a large increase in the device open-circuit voltage (VOC), and the VOC is pinned to this higher value for higher BCP additive loadings. Such results contrast prior studies of ternary blend OPVs where either a continuous change in VOC or a value of VOC pinned to the lowest value is observed. We hypothesize and provide evidence in the form of device and morphology analyses that the impact of VOC is likely due to the formation of a parallel bulk heterojunction made up of isolated PCBM and PNDI acceptor domains separated by intermediate PTB7 donor domains. Our work demonstrates that all-conjugated block copolymers can be utilized as additives to both dictate morphology and modulate themore » electronic properties of the active layer.« less

Authors:
 [1];  [2];  [1];  [3];  [4];  [2];  [5]
  1. Rice Univ., Houston, TX (United States). Dept. of Chemical and Biomolecular Engineering
  2. Univ. of Texas, Austin, TX (United States). Dept. of Chemical Engineering
  3. Univ. of Texas, Austin, TX (United States). Dept. of Materials Science and Texas Materials Inst.
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  5. Rice Univ., Houston, TX (United States). Dept. of Chemical and Biomolecular Engineering and Dept. of Materials Science and NanoEngineering
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1339947
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 4; Journal Issue: 38; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Mok, Jorge W., Kipp, Dylan, Hasbun, Luis R., Dolocan, Andrei, Strzalka, Joseph, Ganesan, Venkat, and Verduzco, Rafael. Parallel bulk heterojunction photovoltaics based on all-conjugated block copolymer additives. United States: N. p., 2016. Web. doi:10.1039/C6TA06502C.
Mok, Jorge W., Kipp, Dylan, Hasbun, Luis R., Dolocan, Andrei, Strzalka, Joseph, Ganesan, Venkat, & Verduzco, Rafael. Parallel bulk heterojunction photovoltaics based on all-conjugated block copolymer additives. United States. doi:10.1039/C6TA06502C.
Mok, Jorge W., Kipp, Dylan, Hasbun, Luis R., Dolocan, Andrei, Strzalka, Joseph, Ganesan, Venkat, and Verduzco, Rafael. Tue . "Parallel bulk heterojunction photovoltaics based on all-conjugated block copolymer additives". United States. doi:10.1039/C6TA06502C. https://www.osti.gov/servlets/purl/1339947.
@article{osti_1339947,
title = {Parallel bulk heterojunction photovoltaics based on all-conjugated block copolymer additives},
author = {Mok, Jorge W. and Kipp, Dylan and Hasbun, Luis R. and Dolocan, Andrei and Strzalka, Joseph and Ganesan, Venkat and Verduzco, Rafael},
abstractNote = {We demonstrated that the addition of block copolymers to binary donor–acceptor blends represents an effective approach to target equilibrium, co-continuous morphologies of interpenetrating donors and acceptors in our recent study. We report a study of the impact of all-conjugated poly(thieno[3,4-b]-thiophene-co-benzodithiophene)-b-polynaphthalene diimide (PTB7-b-PNDI) block copolymer additives on the electronic properties and photovoltaic performance of bulk heterojunction organic photovoltaic active layers comprised of a PTB7 donor and a phenyl-C61-butyric acid methyl ester (PCBM61) acceptor. We find that small amounts of BCP additives lead to improved performance due to a large increase in the device open-circuit voltage (VOC), and the VOC is pinned to this higher value for higher BCP additive loadings. Such results contrast prior studies of ternary blend OPVs where either a continuous change in VOC or a value of VOC pinned to the lowest value is observed. We hypothesize and provide evidence in the form of device and morphology analyses that the impact of VOC is likely due to the formation of a parallel bulk heterojunction made up of isolated PCBM and PNDI acceptor domains separated by intermediate PTB7 donor domains. Our work demonstrates that all-conjugated block copolymers can be utilized as additives to both dictate morphology and modulate the electronic properties of the active layer.},
doi = {10.1039/C6TA06502C},
journal = {Journal of Materials Chemistry. A},
number = 38,
volume = 4,
place = {United States},
year = {Tue Aug 23 00:00:00 EDT 2016},
month = {Tue Aug 23 00:00:00 EDT 2016}
}

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Cited by: 8works
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