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

110 Citations (Scopus)

Abstract

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
Volume18
DOIs
Publication statusPublished - 1 Nov 2015

Keywords

  • 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
  • General Materials Science
  • Electrical and Electronic Engineering

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