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Proceedings Paper

Enhanced efficiency of polymer:fullerene bulk heterojunction solar cells with the insertion of thin pyronin B layer near the Al electrode
Author(s): J. Y. Kim; Y. C. Shin; K. M. Park; C. H. Lee
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Paper Abstract

We show that the insertion of thin interfacial layers of pyronin B between the conjugated polymer-methanofullerene blend and Al electrode enhances the open-circuit voltage (Voc) and short-circuit current density (Jsc). The cells based on blends of poly[2-methoxy,5-(3',7'-dimethyl-octyloxy)]-p-phenylene vinylene (MDMO-PPV) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) with the pyronin B layer (~ 1.5 nm) shows Voc~0.86 V, Jsc~3.36 mA/cm2 and the power conversion efficiency of ~1.46 % under white light photoexcitation of about 80 mW/cm2, similar to the effect of thin LiF layer. Compared to cells without the Pyronin B layer, the power conversion efficiency increases up to about 40 %. Similar effect is also obtained in poly(3-octylthiophene) (P3OT)-PCBM blends. The increased solar cell performance can be attributed to enhanced carrier extraction efficiency at the polymer blend/Al interfaces when pyronin B was inserted. This effect is considered as the reduced Al work function with the thin Pyronin B interfacial layer.

Paper Details

Date Published: 3 October 2005
PDF: 8 pages
Proc. SPIE 5938, Organic Photovoltaics VI, 59381I (3 October 2005); doi: 10.1117/12.620957
Show Author Affiliations
J. Y. Kim, Seoul National Univ. (South Korea)
Y. C. Shin, Seoul National Univ. (South Korea)
K. M. Park, Seoul National Univ. (South Korea)
C. H. Lee, Seoul National Univ. (South Korea)

Published in SPIE Proceedings Vol. 5938:
Organic Photovoltaics VI
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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