Photo-electric conversion element, solid-state imaging element, and electronic apparatus

Abstract

To provide a photo-electric conversion element in which responsiveness and external quantum efficiency are improved. Provided is an organic photo-electric conversion element 10 including: an organic photo-electric conversion layer 13 sandwiched by a first electrode 11 and a second electrode 15 . The organic photo-electric conversion layer 13 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.

What is claimed is: 
     
         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 derivative of a first organic semiconductor and a derivative of a second organic semiconductor,   wherein at least the derivative of the first organic semiconductor out of the organic molecules is in random orientation, and   wherein a crystal grain size of the derivative of the first organic semiconductor is 2 to 5 nm.   
     
     
         2 . The photo-electric conversion element according to  claim 1 , wherein the derivative of the first organic semiconductor is a quinacridone derivative and the derivative of the second organic semiconductor is a subphthalocyanine derivative. 
     
     
         3 . The photo-electric conversion element according to  claim 1 ,
 wherein further the derivative of the second organic semiconductor is in random orientation.   
     
     
         4 . 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 derivative of the first organic semiconductor and a normal-to-stacking-plane line of the organic photo-electric conversion layer is 50° to 60°.   
     
     
         5 . The photo-electric conversion element according to  claim 1 ,
 wherein the organic molecules include two or more kinds of the derivatives of the first organic semiconductor.   
     
     
         6 . The photo-electric conversion element according to  claim 2 ,
 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).   
     
     
         7 . The photo-electric conversion element according to  claim 2 ,
 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).   
     
     
         8 . 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.   
     
     
         9 . An electronic apparatus comprising:
 the solid-state imaging element according to  claim 8 .