Tandem small molecule organic photovoltaic cells with broad spectral response up to 1 μm and a high open-circuit voltage

John P. Mudrick, Weiran Cao, Jian Li, Jiangeng Xue

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

We report a series-connected small molecule tandem photovoltaic cell utilizing two donors with complementary photovoltaic characteristics, lead phthalocyanine (PbPc) in the front subcell and boron subphthalocyanine chloride (SubPc) in the back subcell, to achieve both near infrared (NIR) response up to 1 μm and high open-circuit voltage (VOC) of more than 1.5 V in the same device. We find that the C60layer thickness in the front subcell has a critical impact on the overall optical structure and photovoltaic performance of the tandem device. By combining transfer matrix calculations with subcell-selective spectral measurements, we are able to tune the optical field distribution inside the active layers and increase the photocurrent outputs from both subcells, leading to EQE > 30% over the wavelength range 400 nm < λ < 900 nm. This optimized tandem cell exhibits JSC= (5.5 ± 0.1) mA/cm2, fill factor = 0.54, VOC= 1.53 V, and a power conversion efficiency of (4.5 ± 0.2)%.

Original languageEnglish (US)
Pages (from-to)3024-3030
Number of pages7
JournalOrganic Electronics
Volume15
Issue number11
DOIs
StatePublished - Nov 2014

Keywords

  • Donor-acceptor heterojunction
  • Infrared absorption
  • Optical modeling
  • Organic photovoltaic cells
  • Tandem cells

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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