Synergistic photocurrent addition in hybrid quantum dot: Bulk heterojunction solar cells

Gi Hwan Kim, Bright Walker, David Zhitomirsky, Jungwoo Heo, Seo Jin Ko, Jongnam Park, Edward H. Sargent*, Jin Young Kim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


We investigate the effect of a thin PbS quantum dot (QD) layer on the performance of hybrid quantum-dot-organic solar cells (QD-OSCs). The PbS QD layer is able to function as a photosensitizing layer to improve short circuit current density (JSC) and power conversion efficiency (PCE) by exploiting solar flux in the near infrared region up to 1100nm. The increase in JSC is well represented by changes observed in the external quantum efficiency of devices with and without the PbS QD layer, including the region of the first exciton transition where only the PbS QD layer absorbs. Remarkably, enhanced performance was observed in QD-OSCs consisting of just a 13nm thick PbS QD layer and 150nm PTB7:PC71BM layer, exhibiting a JSC of 17.0mAcm-2, and PCE of 8.30% (8.58% for champion device) compared to reference devices without PbS QD which produced a JSC of 15.4mAcm-2 and PCE of 7.56%.

Original languageEnglish (US)
Pages (from-to)491-499
Number of pages9
JournalNano Energy
StatePublished - Apr 1 2015


  • Bulk-heterojunction solar cells
  • Hybrid solar cells
  • Organic
  • Quantum dot
  • Quantum dot solar cells

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Electrical and Electronic Engineering


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