Effect of Fullerene on Photocurrent Performance of 6-O-Porphyrin-2,3-di-O-stearoylcellulose Langmuir-Blodgett Films

✍ Scribed by Keita Sakakibara; Fumiaki Nakatsubo

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 183 KB
• Volume: 209
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200800027

✦ Synopsis

Abstract

Thin films consisting of 6‐O‐porphyrin‐2,3‐di‐O‐stearoylcellulose (H~2~PCS) and fullerene (C~60~) were fabricated for anodic photocurrent generation systems by the Langmuir‐Blodgett (LB) technique. The π‐complexation between the porphyrin moiety and C~60~ in the LB films was investigated by means of the surface pressure (π)‐area (A) isotherms, UV‐vis, and fluorescence spectroscopy. The photocurrent density generated from the H~2~PCS–C~60~ LB monolayer films exhibited an increase with increasing the C~60~ proportion and reached a maximum at a mixing ratio of 1:2, yielding a quantum yield of 12.5% and an IPCE (incident photon‐to‐current efficiency) of 0.50% at a bias potential of +100 mV vs. SCE. Furthermore, the LB five‐layer films could give rise to the IPCE value of 1.5% at +100 mV without significant decline of the quantum yields, which was due to the function of C~60~ as an electron carrier to improve the interlayer electron transfer through each layer. These results have demonstrated a promising method for preparing the donor–acceptor systems using cellulose as a scaffold in the LB films.

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