Metal Nanostructure of Metal/Organic Interface Causing Photocurrent Multiplication Phenomenon

Masahiro HIRAMOTO  Ichiro SATO  Masaaki YOKOYAMA  

IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.6   pp.1253-1255
Publication Date: 2002/06/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Issue on Recent Progress in Organic Molecular Electronics)
Category: Electronic Devices
organic/metal interface,  photocurrent multiplication phenomenon,  structural trap,  spatial gap,  matal nanoparticle,  

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Metal nanostructure of organic/metal interface showing photocurrent multiplication phenomenon more than 105-fold was investigated. Au films deposited on organic films were revealed to be a gathering of nanoparticles and the multiplication rate can be tuned by the particle size. Spatial gaps formed between Au sphere and organic surface, which provide the hole accumulation sites (structural trap), was concluded to be indispensable for the photocurrent multiplication.