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

Research output: Contribution to journalArticle

17 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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Photovoltaic cells
Nanorods
Graphene
Butyric acid
Butyric Acid
Electrons
Carrier mobility
Photocurrents
Esters
Cathodes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

Cite this

Enhanced charge extraction in inverted hybrid photovoltaic cells assisted by graphene nanoflakes. / Sung, Yun Ming; Hsu, Fang Chi; Wang, Di Yan; Wang, I. Sheng; Chen, Chia Chun; Liao, Hsueh Chung; Su, Wei Fang; Chen, Yang Fang.

In: Journal of Materials Chemistry, Vol. 21, No. 43, 21.11.2011, p. 17462-17467.

Research output: Contribution to journalArticle

Sung, Yun Ming ; Hsu, Fang Chi ; Wang, Di Yan ; Wang, I. Sheng ; Chen, Chia Chun ; Liao, Hsueh Chung ; Su, Wei Fang ; Chen, Yang Fang. / Enhanced charge extraction in inverted hybrid photovoltaic cells assisted by graphene nanoflakes. In: Journal of Materials Chemistry. 2011 ; Vol. 21, No. 43. pp. 17462-17467.
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AU - Liao, Hsueh Chung

AU - Su, Wei Fang

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