Issue 43, 2011
From the journal:

Journal of Materials Chemistry

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

Yun-Ming Sung,a   Fang-Chi Hsu,*b   Di-Yan Wang,c   I.-Sheng Wang,c   Chia-Chun Chen,cd   Hsueh-Chung Liao,e   Wei-Fang Sue  and  Yang-Fang Chen*a  

* Corresponding authors

a Department of Physics, National Taiwan University, Taipei, Taiwan
E-mail: yfchen@phys.ntu.edu.tw

b Department of Materials Science and Engineering, National United University, Miaoli, Taiwan
E-mail: fangchi@nuu.edu.tw

c Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan

d Institute of Atomic and Molecular Science, Academia Sinica, Taipei, Taiwan

e Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan

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 C61butyric 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%.

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

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Article information

DOI
https://doi.org/10.1039/C1JM12571K
Article type
Paper
Submitted
07 Jun 2011
Accepted
30 Aug 2011
First published
30 Sep 2011

J. Mater. Chem., 2011,21, 17462-17467

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

Y. Sung, F. Hsu, D. Wang, I.-Sheng Wang, C. Chen, H. Liao, W. Su and Y. Chen, J. Mater. Chem., 2011, 21, 17462 DOI: 10.1039/C1JM12571K

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