Self-Assembling Tripodal Small-Molecule Donors for Bulk Heterojunction Solar Cells

Taner Aytun, Peter J. Santos, Carson J. Bruns, Dongxu Huang, Andrew R. Koltonow, Monica Olvera De La Cruz, Samuel I Stupp

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The power conversion efficiency of organic solar cells (OSCs) could benefit from systematic studies to improve bulk heterojunction (BHJ) morphology by modifying donor compounds. Supramolecular self-assembly is an attractive strategy to combine the beneficial properties of polymeric donors, such as a well-controlled morphology, with the homogeneous composition of small molecule donors for OSCs. We report here on two tripodal "star-shaped" small-molecule donor compounds based on diketopyrrolopyrrole (DPP) side chains for solution-processed BHJ OSCs. The tripod molecules were found not to aggregate in solution or form crystalline domains in thin films when a branched alkyl chain (2-ethylhexyl) substituent was used, whereas linear (docedecyl) alkyl chains promote the formation of one-dimensional (1D) nanowires and more crystalline domains in the solid state. We demonstrate that the 1D self-assembly of these tripods enhances the performance of the corresponding solution-processed OSCs by 50%, which is attributed to the significant increase in the fill factor of devices resulting from a reduction of trap states.

Original languageEnglish
Pages (from-to)3602-3611
Number of pages10
JournalJournal of Physical Chemistry C
Volume120
Issue number7
DOIs
Publication statusPublished - Feb 25 2016

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assembling
Heterojunctions
heterojunctions
Solar cells
solar cells
tripods
Molecules
Self assembly
self assembly
molecules
Crystalline materials
Conversion efficiency
Nanowires
Stars
nanowires
traps
solid state
stars
Thin films
Organic solar cells

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Aytun, T., Santos, P. J., Bruns, C. J., Huang, D., Koltonow, A. R., Olvera De La Cruz, M., & Stupp, S. I. (2016). Self-Assembling Tripodal Small-Molecule Donors for Bulk Heterojunction Solar Cells. Journal of Physical Chemistry C, 120(7), 3602-3611. https://doi.org/10.1021/acs.jpcc.5b10064

Self-Assembling Tripodal Small-Molecule Donors for Bulk Heterojunction Solar Cells. / Aytun, Taner; Santos, Peter J.; Bruns, Carson J.; Huang, Dongxu; Koltonow, Andrew R.; Olvera De La Cruz, Monica; Stupp, Samuel I.

In: Journal of Physical Chemistry C, Vol. 120, No. 7, 25.02.2016, p. 3602-3611.

Research output: Contribution to journalArticle

Aytun, T, Santos, PJ, Bruns, CJ, Huang, D, Koltonow, AR, Olvera De La Cruz, M & Stupp, SI 2016, 'Self-Assembling Tripodal Small-Molecule Donors for Bulk Heterojunction Solar Cells', Journal of Physical Chemistry C, vol. 120, no. 7, pp. 3602-3611. https://doi.org/10.1021/acs.jpcc.5b10064
Aytun T, Santos PJ, Bruns CJ, Huang D, Koltonow AR, Olvera De La Cruz M et al. Self-Assembling Tripodal Small-Molecule Donors for Bulk Heterojunction Solar Cells. Journal of Physical Chemistry C. 2016 Feb 25;120(7):3602-3611. https://doi.org/10.1021/acs.jpcc.5b10064
Aytun, Taner ; Santos, Peter J. ; Bruns, Carson J. ; Huang, Dongxu ; Koltonow, Andrew R. ; Olvera De La Cruz, Monica ; Stupp, Samuel I. / Self-Assembling Tripodal Small-Molecule Donors for Bulk Heterojunction Solar Cells. In: Journal of Physical Chemistry C. 2016 ; Vol. 120, No. 7. pp. 3602-3611.
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