Enhanced charge extraction in inverted hybrid photovoltaic cells assisted by graphene nanoflakes

Yun Ming Sung, Fang Chi Hsu, Di Yan Wang, I. Sheng Wang, Chia Chun Chen, Hsueh Chung Liao, Wei Fang Su, Yang Fang Chen

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18 Citations (Scopus)

Abstract

We use graphene nanoflakes (GNFs) to greatly enhance the charge extraction out of a photoactive blend in inverted hybrid poly(3-hexylthiophene):(6,6)- phenyl C61 butyric acid methyl ester (P3HT:PCBM)/ZnO-nanorod photovoltaic cells. Instead of a continuous film, solution processed GNFs with dimensions less than 200 nm × 200 nm are homogeneously scattered on top of the well-aligned ZnO-nanorods. Those GNFs play key roles, they serve as an electron drain to collect electron flow out to ZnO-nanorods, enhance the carrier mobility of the device and promote holes to drift toward the surface in contact with the cathode. As a result, there is a large enhancement in photocurrent and photovoltage of 35% and 27%, respectively, leading to an improved cell efficiency by up to about 100%.

Original languageEnglish
Pages (from-to)17462-17467
Number of pages6
JournalJournal of Materials Chemistry
Volume21
Issue number43
DOIs
Publication statusPublished - 2011 Nov 21

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ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

Cite this

Sung, Y. M., Hsu, F. C., Wang, D. Y., Wang, I. S., Chen, C. C., Liao, H. C., Su, W. F., & Chen, Y. F. (2011). Enhanced charge extraction in inverted hybrid photovoltaic cells assisted by graphene nanoflakes. Journal of Materials Chemistry, 21(43), 17462-17467. https://doi.org/10.1039/c1jm12571k