Skip to content

Research at St Andrews

Large crystalline domains and enhanced exciton diffusion length enable efficient organic solar cells

Research output: Contribution to journalArticlepeer-review

Author(s)

Yiwei Zhang, Muhammad T. Sajjad, Oskar Blaszczyk, Andrew J. Parnell, Arvydas Ruseckas, Luis A. Serrano, Graeme Cooke, Ifor D. W. Samuel

School/Research organisations

Abstract

We studied crystallinity and exciton harvesting in bulk heterojunctions of a semiconducting polymer PffBT4T-2OD and electron acceptor PC71BM which are used to make highly efficient organic solar cells. Grazing incidence wide-angle X-ray scattering (GIWAXS) shows that the size of crystalline domains of PffBT4T-2OD increases to ~18 nm in photovoltaic blends upon thermal annealing at 100 °C for 5 minutes. These domains are larger than the typical exciton diffusion lengths in conjugated polymers. Time-resolved fluorescence measurements show that exciton diffusion length in PffBT4T-2OD increases from ~14 to ~24 nm upon thermal annealing, which enables efficient charge generation in blends with large domains. Solar cells prepared using thermally annealed blends show higher photocurrent, open circuit voltage and fill factor compared to as spin-coated blends which indicates reduced recombination losses. Our results demonstrate the advantages of large crystalline domains in organic photovoltaics, providing exciton diffusion is sufficient.
Close

Details

Original languageEnglish
Pages (from-to)6548-6557
JournalChemistry of Materials
Volume31
Issue number17
Early online date1 Apr 2019
DOIs
Publication statusPublished - 10 Sep 2019

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Thermally activated delayed fluorescence emitters with intramolecular proton transfer for high luminance solution-processed organic light-emitting diodes

    Gupta, A., Li, W., Ruseckas, A., Lian, C., Carpenter-Warren, C. L., Cordes, D. B., Slawin, A. M. Z., Jacquemin, D., Samuel, I. D. W. & Zysman-Colman, E., 30 Mar 2021, In: ACS Applied Materials & Interfaces. Articles ASAP

    Research output: Contribution to journalArticlepeer-review

  2. Enhancing exciton diffusion length provides new opportunities for organic photovoltaics

    Sajjad, M. T., Ruseckas, A. & Samuel, I. D. W., 5 Aug 2020, In: Matter. 3, 2, p. 341-354

    Research output: Contribution to journalReview articlepeer-review

  3. Long-range exciton diffusion in non-fullerene acceptors and coarse bulk heterojunctions enable highly efficient organic photovoltaics

    Sajjad, M. T., Ruseckas, A., Jagadamma, L. K., Zhang, Y. & Samuel, I. D. W., 21 Jul 2020, In: Journal of Materials Chemistry. 8, 31, p. 15687-15694 8 p.

    Research output: Contribution to journalArticlepeer-review

  4. Interface limited hole extraction from methylammonium lead iodide films

    Blaszczyk, O., Krishnan Jagadamma, L., Ruseckas, A., Sajjad, M. T., Zhang, Y. & Samuel, I. D. W., 9 Dec 2019, In: Materials Horizons. Advance Article

    Research output: Contribution to journalArticlepeer-review

Related by journal

  1. Chemistry of Materials (Journal)

    Finlay Morrison (Reviewer)

    2009 → …

    Activity: Publication peer-review and editorial work typesPeer review of manuscripts

Related by journal

  1. Cation control of cooperative CO2 adsorption in Li-containing mixed cation forms of the flexible zeolite merlinoite

    Georgieva, V. M., Bruce, E. L., Chitac, R. G., Lozinska, M. M., Hall, A., Murray, C., Smith, R., Turrina, A. & Wright, P. A., 10 Feb 2021, In: Chemistry of Materials. Articles ASAP

    Research output: Contribution to journalArticlepeer-review

  2. Local structure and order-disorder transitions in "empty" ferroelectric tetragonal tungsten bronzes

    McNulty, J. A., Pesquera, D., Gardner, J., Rotaru, A., Playford, H. Y., Tucker, M. G., Carpenter, M. A. & Morrison, F. D., 13 Oct 2020, In: Chemistry of Materials. 32, 19, p. 8492-8501

    Research output: Contribution to journalArticlepeer-review

  3. n-type doping of organic semiconductors: immobilization via covalent anchoring

    Reiser, P., Benneckendorf, F. S., Barf, M-M., Müller, L., Bäuerle, R., Hillebrandt, S., Beck, S., Lovrincic, R., Mankel, E., Freudenberg, J., Jänsch, D., Kowalsky, W., Pucci, A., Jaegermann, W., Bunz, U. H. F. & Müllen, K., 11 Jun 2019, In: Chemistry of Materials. 31, 11, p. 4213-4221 9 p.

    Research output: Contribution to journalArticlepeer-review

  4. A reinvestigation of Na2Fe2(C2O4)2H2O: an iron-based positive electrode for secondary batteries

    Yao, W., Sougrati, M-T., Hoang, K., Hui, J., Lightfoot, P. & Armstrong, A. R., 14 Nov 2017, In: Chemistry of Materials. 29, 21, p. 9095-9101

    Research output: Contribution to journalArticlepeer-review

ID: 258430207

Top