Compound and photoelectric device, image sensor and electronic device including the same

A compound represented by Chemical Formula 1:

• wherein, in Chemical Formula 1
• Ar1 is a substituted or unsubstituted C6 to C30 arene group or a substituted or unsubstituted C3 to C30 heteroarene group,
• Ar2 is a substituted or unsubstituted C6 to C30 hydrocarbon cyclic group, a substituted or unsubstituted C6 to C30 heterocyclic group, or a fused ring thereof,
• Ar2 has at least one functional group selected from C═O, C═S, C═Se, and C═Te
• X is Se, Te, SiRaRb, or GeRcRd (wherein Ra, Rb, Rc, and Rd are independently hydrogen, deuterium, or a substituted or unsubstituted C1 to C10 alkyl group, and wherein Ra, Rb, Rc, and Rd are independently present or Ra and Rb or Rc and Rd are linked with each other to provide a spiro structure), and
• R1 to R3 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heteroaryl group, a substituted or unsubstituted C2 to C30 acyl group, a halogen, a cyano group (—CN), a cyano-containing group, a nitro group, —SiRaRbRc (wherein Ra, Rb, and Re are independently hydrogen or a substituted or unsubstituted C1 to C10 alkyl group), or a combination thereof.