Inverted organic solar cells with ITO electrodes modified with an ultrathin Al2O3 buffer layer deposited by atomic layer deposition

Yinhua Zhou; Hyeunseok Cheun; Willliam J. Potscavage, Jr; Canek Fuentes-Hernandez; Sung-Jin Kim; Bernard Kippelen

doi:10.1039/C0JM00662A

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Inverted organic solar cells with ITO electrodes modified with an ultrathin Al₂O₃buffer layer deposited by atomic layer deposition

Yinhua Zhou,^a Hyeunseok Cheun,^a Willliam J. Potscavage, Jr,^a Canek Fuentes-Hernandez,^a Sung-Jin Kim^a and Bernard Kippelen*^a

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* Corresponding authors

^a Center for Organic Photonics and Electronics (COPE), School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
E-mail: kippelen@ece.gatech.edu

Abstract

We report on the properties of inverted polymer solar cells using an ultrathin Al₂O₃ buffer layer on indium tin oxide (ITO). The ultrathin Al₂O₃ layer, deposited by the atomic layer deposition method, was found to reduce the work function of ITO and turns ITO into an electron-collecting electrode. The current density–voltage characteristics of unexposed devices showed an s-shape kink. The kink was eliminated upon exposure to ultraviolet (UV) illumination. Inverted solar cells based on P3HT:PC₆₀BM yielded a fill factor of 0.64 and a power conversion efficiency of about 2.8% estimated for 100 mW cm⁻² simulated AM 1.5 illumination.

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Article information

DOI: https://doi.org/10.1039/C0JM00662A
Article type: Paper
Submitted: 11 Mar 2010
Accepted: 08 Jun 2010
First published: 28 Jun 2010

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J. Mater. Chem., 2010,20, 6189-6194

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Inverted organic solar cells with ITO electrodes modified with an ultrathin Al₂O₃ buffer layer deposited by atomic layer deposition

Y. Zhou, H. Cheun, W. J. Potscavage, Jr, C. Fuentes-Hernandez, S. Kim and B. Kippelen, J. Mater. Chem., 2010, 20, 6189 DOI: 10.1039/C0JM00662A

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Journal of Materials Chemistry