申请人:Yamanaka Noriyo
公开号:US20110108117A1
公开(公告)日:2011-05-12
Disclosed is a novel photosensitizer that can absorb light in a wide visible light region and in the case of a very thin film form, can enhance a light absorption efficiency by virtue of a large light absorption coefficient. The photosensitizer is used for metal oxide semiconductor electrodes and comprises a metal complex represented by a general formula ML
1
L
2
X
2
, wherein M is a group 8 transition metal of the periodic table, Xs are each independently a halogen atom, a cyano group, a thiocyanate group, an isothiocyanate group, an isocyanate group, an isocyanide group or a hydroxyl group, or a bidentate ligand in the case where Xs are bonded to one another, L
1
and L
2
are each a ligand having an aromatic ring, and either L
1
or L
2
has a functional group having a COOH group or PO(OH)
2
, and when the photosensitizer is adsorbed on a metal oxide semiconductor electrode via ligands L
1
and L
2
, the difference ΔL between the energy levels of ligands L
1
and L
2
in their excited states, calculated in accordance with a GAUSSIAN03 quantum chemistry calculation program is 0.25 eV or more.