The effect of mesomorphology upon the performance of nanoparticulate organic photovoltaic devices

Henrik Friis Dam, Natalie P. Holmes, Thomas Rieks Andersen, Thue Trofod Larsen-Olsen, Matthew Barr, A. L. David Kilcoyne, Xiaojing Zhou, Paul C. Dastoor, Frederik C Krebs, Warwick J. Belcher

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Scanning transmission X-ray microscopy (STXM) compositional mapping has been used to probe the mesomorphology of nanoparticles (NPs) synthesized from two very different polymer:fullerene blends: poly(3-hexylthiophene) (P3HT): phenyl-C61-butyric acid methyl ester (PCBM) and poly[4,8-bis(2-ethylhexyloxy)benzo(1,2-b:4,5-b')dithiophene-alt-5, 6-bis(octyloxy)-4,7-di(thiophen-2-yl)(2,1,3-benzothiadiazole)-5,5'-diyl] (PSBTBT): PCBM. The STXM data shows that both blends form core-shell NP structures with similar shell compositions, but with different polymer:fullerene ratios in the core regions. P3HT:PCBM and PSBTBT:PCBM NP organic photovoltaic (OPV) devices have been fabricated and exhibit similar device efficiencies, despite the PSBTBT being a much higher performing low band gap material. By comparing the measured NP shell and core compositions with the optimized bulk hetero-junction (BHJ) compositions, we show that the relatively higher performance of the P3HT:PCBM NP device arises from the fact that its shell composition is much closer to the optimal BHJ value than that of the PSBTBT:PCBM NP device. [All rights reserved Elsevier].
Original languageEnglish
JournalSolar Energy Materials and Solar Cells
Volume138
Pages (from-to)102-108
Number of pages7
ISSN0927-0248
DOIs
Publication statusPublished - 2015

Keywords

  • Nanoparticle
  • Morphology
  • Organic photovoltaic

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