US 12,336,363 B2
Photoelectric conversion element
Takahiro Seike, Tsukuba (JP); and Giovanni Ferrara, Tsukuba (JP)
Assigned to SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP)
Appl. No. 16/969,831
Filed by SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP)
PCT Filed Mar. 22, 2019, PCT No. PCT/JP2019/012215
§ 371(c)(1), (2) Date Aug. 13, 2020,
PCT Pub. No. WO2019/182142, PCT Pub. Date Sep. 26, 2019.
Claims priority of application No. 2018-056656 (JP), filed on Mar. 23, 2018.
Prior Publication US 2020/0381643 A1, Dec. 3, 2020
Int. Cl. H01L 51/42 (2006.01); H10K 30/15 (2023.01); H10K 30/20 (2023.01); H10K 85/10 (2023.01); H10K 85/20 (2023.01); H10K 39/32 (2023.01); H10K 65/00 (2023.01); H10K 102/00 (2023.01)
CPC H10K 30/152 (2023.02) [H10K 30/20 (2023.02); H10K 85/141 (2023.02); H10K 85/211 (2023.02); H10K 39/32 (2023.02); H10K 65/00 (2023.02); H10K 2102/00 (2023.02)] 14 Claims
OG exemplary drawing
 
1. A light detecting element comprising a pair of electrodes, an active layer provided between the pair of electrodes, and an intermediate layer provided between the active layer and at least one of the pair of electrodes,
wherein the intermediate layer has a surface that is in direct contact with the active layer, the surface having a surface roughness in a range of 0.55 nm to 1.24 nm,
a thickness of the active layer is not less than 400 nm but not more than 700 nm;
wherein the intermediate layer is an electron transport layer;
wherein the electron transport layer comprises a polyalkylene imine or a derivative thereof,
wherein the active layer comprises an n-type semiconductor material and a p-type semiconductor material, and
wherein the p-type semiconductor material is a polymer compound comprising a structural unit represented by the following formula (I) and/or a structural unit represented by the following formula (II):

OG Complex Work Unit Chemistry
wherein in formula (I), Ar1 and Ar2 are trivalent aromatic heterocyclic groups, and Z is a group represented by formulae (Z-1) to (Z-7),
—Ar3—  (II),
wherein in formula (II), Ar3 is a divalent aromatic heterocyclic group,

OG Complex Work Unit Chemistry
wherein in formulae (Z-1) to (Z-7), each R is independently selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, a monovalent heterocyclic group, a substituted amino group, an acyl group, an imine residue, an amide group, an acid imide group, a substituted oxy carbonyl group, an alkenyl group, an alkynyl group, a cyano group, and a nitro group.