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

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/C6TA06502C· OSTI ID:1339947
 [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

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.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1339947
Journal Information:
Journal of Materials Chemistry. A, Vol. 4, Issue 38; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (5)

Random Copolymers Outperform Gradient and Block Copolymers in Stabilizing Organic Photovoltaics journal March 2019
Significantly Improved Morphology and Efficiency of Nonhalogenated Solvent‐Processed Solar Cells Derived from a Conjugated Donor–Acceptor Block Copolymer journal January 2020
Semiconducting alternating multi-block copolymers via a di-functionalized macromonomer approach journal January 2017
Deconstructing the behavior of donor–acceptor copolymers in solution & the melt: the case of PTB7 journal January 2019
Facile one-pot polymerization of a fully conjugated donor–acceptor block copolymer and its application in efficient single component polymer solar cells journal January 2019

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