4.8 Article

Toward Additive-Free Small-Molecule Organic Solar Cells: Roles of the Donor Crystallization Pathway and Dynamics

Journal

ADVANCED MATERIALS
Volume 27, Issue 45, Pages 7285-+

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201503395

Keywords

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Funding

  1. Office of Naval Research (ONR) [N00014-141-0101]
  2. UK's Engineering and Physical Sciences Research Council (EPSRC) [EP/J021199/1]
  3. NSF & NIH/NIGMS via NSF award [DMR-1332208]
  4. Office of Competitive Research (KAUST)
  5. EPSRC [EP/J021199/1] Funding Source: UKRI
  6. Engineering and Physical Sciences Research Council [EP/J021199/1] Funding Source: researchfish

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The ease with which small-molecule donors crystallize during solution processing is directly linked to the need for solvent additives. Donor molecules that get trapped in disordered (H1) or liquid crystalline (T1) mesophases require additive processing to promote crystallization, phase separation, and efficient light harvesting. A donor material (X2) that crystallizes directly from solution yields additive-free solar cells with an efficiency of 7.6%.

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