High Performance PbS Quantum Dot/Graphene Hybrid Solar Cell with Efficient Charge Extraction

Byung Sung Kim, Darren C.J. Neo, Bo Hou, Jong Bae Park, Yuljae Cho, Nanlin Zhang, John Hong, Sangyeon Pak, Sanghyo Lee, Jung Inn Sohn, Hazel E. Assender, Andrew A.R. Watt, Seungnam Cha, Jong Min Kim

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

Hybrid colloidal quantum dot (CQD) solar cells are fabricated from multilayer stacks of lead sulfide (PbS) CQD and single layer graphene (SG). The inclusion of graphene interlayers is shown to increase power conversion efficiency by 9.18%. It is shown that the inclusion of conductive graphene enhances charge extraction in devices. Photoluminescence shows that graphene quenches emission from the quantum dot suggesting spontaneous charge transfer to graphene. CQD photodetectors exhibit increased photoresponse and improved transport properties. We propose that the CQD/SG hybrid structure is a route to make CQD thin films with improved charge extraction, therefore resulting in improved solar cell efficiency.

Original languageEnglish
Pages (from-to)13902-13908
Number of pages7
JournalACS Applied Materials and Interfaces
Volume8
Issue number22
DOIs
StatePublished - 8 Jun 2016

Keywords

  • Charge transfer
  • Exciton dissociation
  • Graphene
  • Hybrid solar cell
  • PbS quantum dot

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