Organic photoelectric conversion element and producing method of the same

1. An organic photoelectric conversion element comprising:

a first electrode;

a second electrode; and

an organic photoelectric conversion layer sandwiched between the first electrode and the second electrode,

wherein the first electrode comprises:

a conductive fiber layer; and

a transparent conductive layer containing a conductive polymer comprising a π conjugated conductive polymer and a polyanion, and an aqueous binder, and

at least a part of the transparent conductive layer containing the conductive polymer and the aqueous binder is cross-linked therein, wherein the aqueous binder comprises Polymer (A) containing the following recurring units:

wherein X 1 to X 3 each respectively represent a hydrogen atom or a methyl group; R 1 to R 3 each respectively represent an alkylene group having a carbon number of 5 or less; l, m and n each respectively represent a ratio of each recurring unit when the total molar number of monomers composing Polymer (A) is set to be 100, provided that l, m and n satisfy the relationship of: 50≦1+m+n≦100.

2. The organic photoelectric conversion element of claim 1 ,

wherein the polyanion contains a sulfo group as an anionic group.

3. The organic photoelectric conversion element of claim 1 ,

wherein the conductive fiber layer is a metal nanowire.

4. The organic photoelectric conversion element of claim 1 ,

wherein the first electrode comprises:

the conductive fiber layer containing a metal nanowire; and

the transparent conductive layer containing (i) the conductive polymer comprising the π conjugated conductive polymer and the polyanion; and (ii) the aqueous binder comprising Polymer (A) containing the foregoing recurring units.

5. The organic photoelectric conversion element of claim 1 ,

wherein the transparent conductive layer which composes the first electrode contains conductive particles.

6. A method for forming an organic photoelectric conversion element comprising the steps of:

coating a conductive fiber containing liquid on a substrate;

drying the coated conductive fiber containing liquid;

coating a liquid containing a conductive polymer comprising a π conjugated conductive polymer and a polyanion, and an aqueous binder comprising Polymer (A) having the following recurring units to form a first electrode;

forming an organic photoelectric conversion layer; and

forming a second electrode:

wherein, X 1 to X 3 each respectively represent a hydrogen atom or a methyl group; R 1 to R 3 each respectively represent an alkylene group having a carbon number of 5 or less; 1, m and n each respectively represent a ratio of each recurring unit when the total molar number of monomers composing Polymer (A) is set to be 100, provided that 1, m and n satisfy the relationship of: 50≦1+m+n≦100.