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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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