TITLE

Imaging and spectromicroscopy of photocarrier electron dynamics in C60 fullerene thin films

AUTHOR(S)
Masahiro Shibuta; Kana Yamagiwa; Toyoaki Eguchi; Atsushi Nakajima
PUB. DATE
November 2016
SOURCE
Applied Physics Letters;11/14/2016, Vol. 109 Issue 20, p203111-1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have employed a two-photon photoelectron emission microscopy (2P-PEEM) to observe the photocarrier electron dynamics in an organic thin film of fullerene (C60) formed on a highly oriented pyrolytic graphite with a spatial resolution of ca. 135 nm. In this approach, photocarrier electrons in C60 single-layer islands generated by the first pump photon are detected by the second probe photon. These spectromicroscopic observations conducted over a 100×100 nm2 region of C60 islands consistently reproduced the macroscopic two-photon photoemission spectrum of fully covered C60 monolayer film, where the energy of photocarrier electron in the islands was +0.9 eV relative to the Fermi level. Time-resolved 2P-PEEM revealed that the photocarrier electron decayed from the monolayered C60 islands into the substrate with a time constant of 470±30 fs.
ACCESSION #
119620163

 

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