Photo-electric conversion element, solid-state imaging element, and electronic apparatus
To provide a photo-electric conversion element in which responsiveness and external quantum efficiency are improved. Provided is an organic photo-electric conversion element including: an organic photo-electric conversion layer sandwiched by a first electrode and a second electrode. The organic photo-electric conversion layer contains organic molecules of a quinacridone (QD) derivative and a subphthalocyanine (SubPc) derivative, and at least the quinacridone derivative out of the organic molecules is in random orientation.
1. A photo-electric conversion element comprising:
an organic photo-electric conversion layer sandwiched by a first electrode and a second electrode,
wherein the organic photo-electric conversion layer contains organic molecules of a quinacridone derivative and a subphthalocyanine derivative,
wherein at least the quinacridone derivative out of the organic molecules is in random orientation, and
wherein a crystal grain size of the quinacridone derivative is 2 to 5 nm.
2. The photo-electric conversion element according to claim 1 ,
wherein further the subphthalocyanine derivative is in random orientation.
3. The photo-electric conversion element according to claim 1 ,
wherein the random orientation is orientation of a direction in which an angle between an average orientation of transition dipole moments of the quinacridone derivative and a normal-to-stacking-plane line of the organic photo-electric conversion layer is 50° to 60°.
4. The photo-electric conversion element according to claim 1 ,
wherein the organic molecules include two or more kinds of quinacridone derivative.
5. The photo-electric conversion element according to claim 1 ,
wherein the quinacridone derivative includes at least two of 2,9-diethylquinacridone (EQD), 2,9-di-tert-butylquinacridone (BQD), N,N′-dimethylquinacridone (DMQD), N,N′-diphenylquinacridone (DPQD), N,N′-diphenyl-2,9-di-tert-butylquinacridone (BPQD), N-methylquinacridone (MMQD), N-methyl-2,9-dimethylquinacridone (TMQD), N-methyl-2,9-di-tert-butylquinacridone (BMQD), and N-phenylquinacridone (MPQD).
6. The photo-electric conversion element according to claim 1 ,
wherein the subphthalocyanine derivative is any one of hexafluoroboron subphthalocyanine chloride (F6-SubPc-Cl), hexafluoroboron subphthalocyanine-4-chlorophenoxide (F6-SubPc-OPh), boron subphthalocyanine chloride (SubPc-Cl), and hexafluoroboron subphthalocyanine-4-chlorophenoxide (SubPc-OPh).
7. A solid-state imaging element comprising at least:
the photo-electric conversion element according to claim 1 ; and
a semiconductor substrate,
wherein the photo-electric conversion element and the semiconductor substrate are stacked for each of a plurality of one-dimensionally or two-dimensionally arranged pixels.
8. An electronic apparatus comprising:
the solid-state imaging element according to claim 7 .