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 journalArticle

16 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

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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