US 12,274,166 B2
Photosensitive material and photodetector including the same
Dae Sung Chung, Pohang-si (KR); and Ju Hee Kim, Pohang-si (KR)
Assigned to Postech Research and Business Development Foundation
Filed by POSTECH Research and Business Development Foundation, Pohang-Si (KR)
Filed on Apr. 22, 2021, as Appl. No. 17/237,453.
Claims priority of application No. 10-2020-0140437 (KR), filed on Oct. 27, 2020.
Prior Publication US 2022/0131084 A1, Apr. 28, 2022
Int. Cl. H10K 30/00 (2023.01); C07D 333/24 (2006.01); H10K 30/30 (2023.01); H10K 30/82 (2023.01); H10K 39/32 (2023.01); H10K 85/60 (2023.01)
CPC H10K 85/655 (2023.02) [C07D 333/24 (2013.01); H10K 30/30 (2023.02); H10K 30/451 (2023.02); H10K 30/82 (2023.02); H10K 39/32 (2023.02)] 11 Claims
 
1. A photodetector comprising a photoactive layer having a photocurrent density of at most about 10−6 A/cm2 under a first incidence condition, and having a photocurrent density of at least about 10−4 A/cm2 under a second incidence condition,
wherein a wavelength of light under the second incidence condition is the same as a wavelength of light under the first incidence condition, and an intensity of light under the second incidence condition is greater than an intensity of light under the first incidence condition,
wherein the photoactive layer includes a photosensitive material, and the photosensitive material has a first state represented by Chemical Formula 1, and a second state in which a carbon to which Ra is bonded and a carbon to which Ra is bonded, in Chemical Formula 1, are connected to each other to form a ring structure,

OG Complex Work Unit Chemistry
wherein, in Chemical Formula 1, R1 and R2 each independently include a substituted or unsubstituted aromatic ring compound having 5 to 20 carbon atoms, R3 and R4 are each independently an alkyl group having 1 to 3 carbon atoms, X1, X2, X3, and X4 are each independently hydrogen or a halogen element, and at least one of X1, X2, X3, or X4 includes a halogen element, and
wherein R1 and R2 are each independently a cyano (—CN)-substituted aromatic ring compound having 5 to 20 carbon atoms, or a halogen-substituted aromatic ring compound having 5 to 20 carbon atoms.