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Proceedings Paper

Low density of gold nanorods in the anodic layer for enhancing the efficiency of organic solar cells
Author(s): Alaa Y. Mahmoud; Jianming Zhang; Jayanta K. Baral; Ricardo Izquierdo; Dongling Ma; Muthukuraman Packirisamy; Vo-Van Truong
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Paper Abstract

The effect of using an anodic layer with low density (~ 6x108 cm-2) of gold nanorods (GNR) in organic bulk heterojunction poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) solar cells was studied. GNRs were deposited using several techniques, which produced various densities of GNRs on the anode layer. The anodic layers were characterized microscopically and spectroscopically. The power conversion efficiency and the short-circuit current for experimental devices incorporating GNR anodic layer showed an enhancement of up to 18% as compared to the control device. The results suggest that the electric field in the P3HT:PCBM active layer was increased by the localized surface plasmon resonances in GNRs. The increase in the electric field enhanced the photo-generation of excitons in the active layer near the plasmon peak, which improved the short-circuit current and the overall power conversion efficiency. Interestingly, photovoltaic devices with a low density of GNRs in the anodic layer showed an increase in the power conversion efficiency that was superior to that of devices with a higher density of GNRs in the anodic layer. This suggests that although the anodic layer with a higher density of GNRs absorbed more light, part of this light was confined in the anodic layer itself, and prevented from reaching the active layer of the bulk heterojunction device. In such cases, the power conversion efficiency was even found to be decreased with respect to the value for the control device.

Paper Details

Date Published: 8 September 2011
PDF: 9 pages
Proc. SPIE 8007, Photonics North 2011, 80071V (8 September 2011); doi: 10.1117/12.904055
Show Author Affiliations
Alaa Y. Mahmoud, Concordia Univ. (Canada)
Jianming Zhang, Institut National de la Recherche Scientifique (Canada)
Jayanta K. Baral, Concordia Univ. (Canada)
Univ. du Québec à Montréal (Canada)
Ricardo Izquierdo, Univ. du Québec à Montréal (Canada)
Dongling Ma, Institut National de la Recherche Scientifique (Canada)
Muthukuraman Packirisamy, Concordia Univ. (Canada)
Vo-Van Truong, Concordia Univ. (Canada)

Published in SPIE Proceedings Vol. 8007:
Photonics North 2011
Raman Kashyap; Michel Têtu; Rafael N. Kleiman, Editor(s)

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