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Diketopyrrolopyrrole-based polymer:fullerene nanoparticle films with thermally stable morphology for organic photovoltaic applications

  • Natalie P. Holmes (a1), Ben Vaughan (a1) (a2), Evan L. Williams (a3), Renee Kroon (a4) (a5), Mats R. Anderrson (a4) (a5), A.L.David Kilcoyne (a6), Prashant Sonar (a3) (a7), Xiaojing Zhou (a1), Paul C. Dastoor (a1) and Warwick J. Belcher (a1)...

Polymer:fullerene nanoparticles (NPs) offer two key advantages over bulk heterojunction (BHJ) films for organic photovoltaics (OPVs), water-processability and potentially superior morphological control. Once an optimal active layer morphology is reached, maintaining this morphology at OPV operating temperatures is key to the lifetime of a device. Here we study the morphology of the PDPP-TNT (poly{3,6-dithiophene-2-yl-2,5-di(2-octyldodecyl)-pyrrolo[3,4-c]pyrrole-1,4-dione-alt-naphthalene}):PC71BM ([6,6]-phenyl C71 butyric acid methyl ester) NP system and then compare the thermal stability of NP and BHJ films to the common poly(3-hexylthiophene) (P3HT): phenyl C61 butyric acid methyl ester (PC61BM) system. We find that material T g plays a key role in the superior thermal stability of the PDPP-TNT:PC71BM system; whereas for the P3HT:PC61BM system, domain structure is critical.

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Address all correspondence to Natalie P. Holmes at
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MRS Communications
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