Efficiency Enhancement of Silicon Heterojunction Solar Cells via Photon Management Using Graphene Quantum Dot as Downconverters

Meng Lin Tsai, Wei Chen Tu, Libin Tang, Tzu Chiao Wei, Wan Rou Wei, Shu Ping Lau, Lih Juann Chen, Jr Hau He

Research output: Journal article publicationJournal articleAcademic researchpeer-review

91 Citations (Scopus)


By employing graphene quantum dots (GQDs), we have achieved a high efficiency of 16.55% in n-type Si heterojunction solar cells. The efficiency enhancement is based on the photon downconversion phenomenon of GQDs to make more photons absorbed in the depletion region for effective carrier separation, leading to the enhanced photovoltaic effect. The short circuit current and the fill factor are increased from 35.31 to 37.47 mA/cm2and 70.29% to 72.51%, respectively. The work demonstrated here holds the promise for incorporating graphene-based materials in commercially available solar devices for developing ultrahigh efficiency photovoltaic cells in the future.
Original languageEnglish
Pages (from-to)309-313
Number of pages5
JournalNano Letters
Issue number1
Publication statusPublished - 13 Jan 2016


  • graphene
  • heterojunction
  • photovoltaic
  • quantum dot
  • solar cells

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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