Jump to main content
Jump to site search

Issue 38, 2016
Previous Article Next Article

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

Author affiliations

Abstract

In recent studies, 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. Here, 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. Altogether, this 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.

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

Back to tab navigation

Supplementary files

Publication details

The article was received on 29 Jul 2016, accepted on 23 Aug 2016 and first published on 23 Aug 2016


Article type: Paper
DOI: 10.1039/C6TA06502C
Citation: J. Mater. Chem. A, 2016,4, 14804-14813
  • Open access: Creative Commons BY license
  •   Request permissions

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

    J. W. Mok, D. Kipp, L. R. Hasbun, A. Dolocan, J. Strzalka, V. Ganesan and R. Verduzco, J. Mater. Chem. A, 2016, 4, 14804
    DOI: 10.1039/C6TA06502C

    This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements