Solution Processed Titanyl Phthalocyanines as Donors in Solar Cells: Photoresponse to 1000 nm

Mayank Mayukh, Mariola R. Macech, Diogenes Placencia, Yu Cao, Neal R Armstrong, Dominic V Mcgrath

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We report a route to thin-film polymorphs of soluble TiOPc derivatives that exhibit similar near-IR absorptivities as vapor deposited thin-films of the parent TiOPc chromophore (phase-I and phase-II polymorphs) and demonstrate that solution-processed planar and bulk heterojunction solar cells fabricated with one of these derivatives exhibited photoactivity throughout the same near-IR wavelength range without compromising VOC. Solution-processed thin-films of soluble octakis(alkylthio)-substituted TiOPc derivatives 1-3 exhibit absorption extending to 1000 nm. When incorporated into OPV devices, the contributions from the lowest CT excitonic state (QB band) of 1 to device performance were evident in both PHJ and BHJ architectures, indicating sufficient driving force for PIET. This contribution was improved via intimate mixing of donor and acceptor molecules in a BHJ architecture, albeit with a decrease in efficiency. IPCE of the best performing BHJ device revealed a contribution from 1 exceeding that of acceptor PCBM, and extending to 1000 nm.

Original languageEnglish (US)
Pages (from-to)23912-23919
Number of pages8
JournalACS Applied Materials and Interfaces
Volume7
Issue number43
DOIs
StatePublished - Oct 9 2015

Keywords

  • near-infrared
  • organic photovoltaic
  • organic thin films
  • polymorphs
  • X-ray diffraction

ASJC Scopus subject areas

  • Materials Science(all)

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