Light-absorbing material and photoelectric conversion element
View Patent ↗The present invention provides a light-absorbing material capable of providing high photoelectric conversion efficiency when applied to a photoelectric conversion element. The light-absorbing material of the present invention has a structure represented by Formula (1) below: X—Y (1) (wherein X represents a light-absorbing site, and Y represents a radical site that becomes a radical when in an oxidized state and/or when in a reduced state, and is capable of repeated oxidation-reduction).
1. A light-absorbing material having a structure represented by Formula (1) below:
X—Y (1),
wherein X represents a light-absorbing site, and Y represents a radical site that becomes a radical when in an oxidized state and/or when in a reduced state, and is capable of repeated oxidation-reduction,
Y in the Formula (1) is an electron acceptor for X and includes any of a bipyridinium group, a substituted bipyridinium group, a galvinoxyl radical group and a substituted galvinoxyl radical group, and
X in the Formula (1) includes a structure represented by General Formula (B) below:
where, in the General Formula (B), X 1 and X 2 are each independently a group including at least one of an alkyl group, an alkenyl group, an aralkyl group, an aryl group and a heterocycle, and each may be substituted, and the radical site Y binds to either of X 1 and X 2 .
2. A photoelectric conversion element, comprising:
the light-absorbing material according to claim 1 ;
an electron transport layer; and
a hole transport layer.
3. A light-absorbing material having a structure represented by Formula (1) below:
X—Y (1),
wherein X represents a light-absorbing site, and Y represents a radical site that becomes a radical when in an oxidized state and/or when in a reduced state, and is capable of repeated oxidation-reduction,
Y in the Formula (1) is an electron acceptor for X,
Y in the Formula (1) includes any of a galvinoxyl radical group and a substituted galvinoxyl radical group, and
X in the Formula (1) includes a structure represented by General Formula (C) below:
where, in the General Formula (C), each R′ independently represents hydrogen or a carboxyl group, a sulfonyl group, a phenyl group, a carboxyphenyl group, a sulfophenyl group or a pyridinium group, and at least one R′ substitutes for Y.
4. A photoelectric conversion element, comprising:
the light-absorbing material according to claim 3 ;
an electron transport layer; and
a hole transport layer.