Efficient solution-processed small-molecule solar cells by insertion of graphene quantum dots

Dong Hwan Wang, Jung Kyu Kim, Sang Jin Kim, Byung Hee Hong, Jong Hyeok Park

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

In this work, we have demonstrated the results of several positive effects that arise from the addition of graphene quantum dots (GQDs) to solution-processed small molecule bulk-heterojunction (SM-BHJ) solar cells fabricated from a p-DTS(FBTTh2)2/[6,6]-phenyl C71 butyric acid methyl-ester (PC71BM). The device with an optimized ratio of GQDs exhibits increased current density and fill factor owing to 10% improved external quantum efficiency (EQE) and induction of a favorable SM-BHJ morphology. Additionally, the multiple scattering of the GQDs in the SM-BHJ leads to longer optical pathlengths according to the analysis of diffuse reflectance spectra and UV/Vis absorption spectra. The GQD inserted SM-BHJ film at the optimized concentration exhibits decreased charge transport resistance significantly by impedance measurements with effective charge extraction in the device which contributes to 15% enhancement of power conversion efficiency (PCE). This journal is

Original languageEnglish
Pages (from-to)15175-15180
Number of pages6
JournalNanoscale
Volume6
Issue number24
DOIs
Publication statusPublished - 2014 Dec 21

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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