a
Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
E-mail: tsuji@chem.s.u-tokyo.ac.jp
;
Fax: +81-3-5800-6889
;
Tel: +81-3-5841-4356
b
Organic Solids Laboratory, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, China
;
Fax: +86-10-62559373
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Tel: +86-10-62639355
c
JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Japan
d
Laboratory of Photonics and Interfaces, Institute of Chemical Science and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Station 6, Lausanne, Switzerland
E-mail: michael.graetzel@epfl.ch
;
Fax: +41-21-693-6100
;
Tel: +41-21-693-3112