Economical low-light photovoltaics by using the Pt-free dye-sensitized solar cell with graphene dot/PEDOT: PSS counter electrodes

Chuan Pei Lee, Chin An Lin, Tzu Chiao Wei, Meng Lin Tsai, Ying Meng, Chun Ting Li, Kuo Chuan Ho, Chih I. Wu, Shu Ping Lau, Jr Hau He

Research output: Journal article publicationJournal articleAcademic researchpeer-review

81 Citations (Scopus)


Graphene dots (GDs) are used for enhancing the performance of the poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS)-based counter electrodes in Pt-free dye-sensitized solar cells (DSSCs). As compared to PEDOT:PSS CEs, GD-PEDOT:PSS films possess a rough surface morphology, high conductivity and electrocatalytic activity, and low charge-transfer resistance toward I-/I3-redox reaction, pushing cell efficiency to 7.36%, which is 43% higher than that of the cell with PEDOT:PSS CEs (5.14%). Without much impact on efficiency, the DSSCs with GD-PEDOT:PSS CEs work well under low-light conditions (light intensity <13.5mWcm-2and angle of incidence >60°), such as indoor and low-level outdoor lighting and of the sun while the other traditional cells would fail to work. The concurrent advantage in low cost in Pt-free materials, simple fabrication processes, comparable efficiency with Pt CEs, and high performance under low-light conditions makes the DSSC with GD-PEDOT:PSS CEs suitable to harvest light for a diverse range of indoor and low-level outdoor lighting locations.
Original languageEnglish
Pages (from-to)109-117
Number of pages9
JournalNano Energy
Publication statusPublished - 1 Nov 2015


  • Conducting polymer
  • Dye-sensitized solar cell
  • Graphene quantum dots
  • Low light
  • Platinum-free counter electrode

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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