Comparison of the solution and vacuum-processed quinacridones in homojunction photovoltaics

Sebastian Dunst, Esther Karner, Maria Elisabetta Coppola, Gregor Trimmel, Mihai Irimia-Vladu*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Abstract: In this work, we explored industrially relevant pigments quinacridones as organic semiconductors with respect to their applicability in air-stable homojunction (single material-single layer) organic photovoltaic cells. We studied quinacridone and two linear transquinacridones, i.e., Pigment Red 122 (2,9′-dimethylquinacridone) and Pigment Red 202 (2,9′-dichloroquinacridone) in vacuum-processible OPV films and compared their performance to OPV films made from their solution-processed counterparts. We show that this class of materials generates photocurrent without the need of creating a donor–acceptor junction. Stable homojunctions were created both via vacuum-processible and solution-processible routes, with the latter method based on the chemical functionalization of the respective molecules with the thermolabile group, t-BOC, that affords solubility in various organic solvents and conversion back to the parent molecule via exposure to temperatures around 170 °C for periods not exceeding 30 min. We show that power conversion efficiencies around 0.15% are reachable without scrupulous optimization of the homojunction cells in terms of electrode surface functionalization or film deposition conditions. This class of materials holds promise for the further development of a new generation of air-stable organic photovoltaic cells based on simple fabrication technologies. Graphical abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)863-870
Number of pages8
JournalMonatshefte für Chemie - Chemical Monthly
Volume148
Issue number5
DOIs
Publication statusPublished - 1 May 2017

Keywords

  • Hydrogen bonds
  • Organic photovoltaics
  • Quinacridone
  • Transquinacridones
  • UV/Vis spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)

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