A Molecular Photodiode System That Can Switch Photocurrent Direction-Reference-Cited by-同舟云学术

A Molecular Photodiode System That Can Switch Photocurrent Direction

Published:2004-06-25 Issue:5679 Volume:304 Page:1944-1947
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Yasutomi Shiro¹,Morita Tomoyuki¹,Imanishi Yukio¹,Kimura Shunsaku¹

Affiliation:

1. Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto-Daigaku-Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.

Abstract

We prepared a molecular photodiode system in which the photocurrent direction can be switched by choosing the wavelength of an irradiating light. The molecular system is composed of two types of helical peptides that carry different chromophores and have different directions of dipole moments when they are immobilized on gold. The mixed, self-assembled monolayer generated an anodic photocurrent when one of the two chromophores was photoexcited, whereas the photocurrent switched to being cathodic when the other chromophore was photoexcited. The opposite current response arises from the dipole moment of each helical peptide, which accelerates electron transfer in the same direction.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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