Controlling J-aggregate formation for increased short-circuit current and power conversion efficiency with a squaraine donor

Susan Spencer, Harry Hu, Qimeng Li, Hyo Yang Ahn, Maher Qaddoura, Sheng Yao, Andronique Ioannidis, Kevin Belfield, Christopher J. Collison

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

A squaraine dye is tested for novel application in a near-infrared-active organic photovoltaic cell that is subsequently optimized to obtain a power conversion efficiency of 2.4 ± 0.3%. The optimization utilizes an Alq3 buffer layer and macroscopic structure control through the addition of co-solvents in the spin-casting process. Co-solvent addition increases the amount of aggregates present as measured through linear absorption spectroscopy, and there is a concurrent increase in both efficiency and short-circuit current. An interpretation of the greatly increased current density is presented that describes how increased J-aggregation likely increases hole mobility and, as a result, charge separation of the photogenerated excited state.

Original languageEnglish (US)
Pages (from-to)488-493
Number of pages6
JournalProgress in Photovoltaics: Research and Applications
Volume22
Issue number4
DOIs
StatePublished - Apr 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Keywords

  • aggregates
  • organic photovoltaic cells
  • squaraines

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