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Proceedings Paper

Fabrication of bulk heterojunction photovoltaic devices using sublimable rhenium diimine complexes as photosensitizers
Author(s): Hei Ling Wong; Kai Wing Cheng; Kitty Ka Yan Man; Chung Yin Kwong; Wai Kin Chan; Aleksandra B. Djurisic
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Paper Abstract

A series of chlorotricarbonyl rhenium (I) bis(phenylimino)acenaphthene (Re-DIAN-X) complexes were used as the photosensitizers for photovoltaic cells. Unlike other transition-metal-based photovoltaic sensitizers that can only be prepared by solution method, these complexes are sublimable. Compared to other rhenium diimine complexes based on bipyridine or 1,4-diaza-1,3-butadiene ligands, these complexes have lower band gaps, which can be modified easily by changing the structure of the ligand. It allows the preparation of blend of metal complexes in order to broaden the sensitization region in UV-vis absorption spectrum. One of the complexes also shows bipolar charge transport character with relatively high charge carrier mobilities in the order of 10-3 cm2V-1s-1. Multilayer heterojunction and bulk heterojunction devices with fullerene as the electron accepting molecule were prepared. For the bulk heterojunction devices, the fill factor and power conversion efficiency under AM 1.5 simulated solar light illumination were 0.51 and 1.29 %, respectively. The effects of changing the Re-DIAN/C60 film thickness, Re-DIAN/C60 ratio and variation of ligand structures in the bulk heterojunction devices were studied. The amount of photosensitizer and electron transport molecules may strongly affect the balance between the photon absorption, exciton formation, dissociation, and charge transport processes. Atomic force microscopic images showed that the complex dispersed evenly with fullerene molecules in solid state.

Paper Details

Date Published: 3 November 2004
PDF: 8 pages
Proc. SPIE 5520, Organic Photovoltaics V, (3 November 2004); doi: 10.1117/12.558680
Show Author Affiliations
Hei Ling Wong, Univ. of Hong Kong (Hong Kong China)
Kai Wing Cheng, Univ. of Hong Kong (Hong Kong China)
Kitty Ka Yan Man, Univ. of Hong Kong (Hong Kong China)
Chung Yin Kwong, Univ. of Hong Kong (Hong Kong China)
Wai Kin Chan, Univ. of Hong Kong (Hong Kong China)
Aleksandra B. Djurisic, Univ. of Hong Kong (Hong Kong China)

Published in SPIE Proceedings Vol. 5520:
Organic Photovoltaics V
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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