Charge transport effect and photovoltaic conversion of two-dimensional CdSeS quantum dot monolayers in inverted polymer solar cells

Guh Hwan Lim, Kyu Seung Lee, Young Jae Park, Jaeho Shim, Jin Woo Choi, Minju Kim, Yeonghoon Jin, Byungkwon Lim, Yeonjin Yi, Chang Lyoul Lee, Jun Yeon Hwang, Dong Ick Son

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Abstract

Herein, we demonstrate that two-dimensional (2D) CdSeS quantum dot monolayers (QDM) can strongly influence efficient charge transport and charge separation, improving the performance of inverted polymer solar cells (iPSCs). Also, for the first time we report the electronic band structure of CdSeS and CdSeS@ZnS QDs and an effective approach to apply the 2D QDM as an effective electron transport layer in iPSCs from work function studies. The iPSCs with the 2D CdSeS QDM showed maximum power conversion efficiencies of 8.83%, which were 26% higher than the reference. Ultraviolet photoelectron spectroscopy and time-correlated single photon counting (TCSPC) measurements were performed to confirm the charge separation and electron transport behavior in the iPSCs with 2D QDMs. The PL decay time of the iPSCs with the CdSeS QDM at 720 nm was ∼60 ps, which is much faster than that of the iPSCs without the 2D QDM. The enhanced photovoltaic performance of the iPSCs with the 2D CdSeS QDM can be attributed to the effective charge separation and electron transport performance due to the high built-in voltage and fast exciton decay time from the 2D QDM.

Original languageEnglish
Pages (from-to)11797-11805
Number of pages9
JournalJournal of Materials Chemistry C
Volume7
Issue number38
DOIs
Publication statusPublished - 2019 Jan 1

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Cite this

Lim, G. H., Lee, K. S., Park, Y. J., Shim, J., Choi, J. W., Kim, M., Jin, Y., Lim, B., Yi, Y., Lee, C. L., Hwang, J. Y., & Son, D. I. (2019). Charge transport effect and photovoltaic conversion of two-dimensional CdSeS quantum dot monolayers in inverted polymer solar cells. Journal of Materials Chemistry C, 7(38), 11797-11805. https://doi.org/10.1039/c9tc04227j