Organic photoelectric device and image sensor
An organic photoelectric device may include a first electrode and a second electrode facing each other and an active layer between the first electrode and the second electrode, the active layer including a compound represented by Chemical Formula 1 and a compound represented by Chemical Formula 2. An image sensor may include the organic photoelectric device.
1. An organic photoelectric device comprising:
a first electrode and a second electrode facing each other; and
an active layer between the first electrode and the second electrode, the active layer including a compound represented by the following Chemical Formula 1 and a compound represented by the following Chemical Formula 2:
wherein, in Chemical Formula 1,
each of R 1 and R 2 are independently one of hydrogen, a substituted or unsubstituted C 1 to C 30 alkyl group, a substituted or unsubstituted C 6 to C 30 aryl group, a substituted or unsubstituted C 3 to C 30 heteroaryl group, a substituted or unsubstituted C 1 to C 30 alkoxy group, and a combination thereof, and
each of R 3 to R 12 are independently one of hydrogen, a substituted or unsubstituted C 1 to C 30 alkyl group, a substituted or unsubstituted C 6 to C 30 aryl group, a substituted or unsubstituted C 3 to C 30 heteroaryl group, a substituted or unsubstituted C 1 to C 30 alkoxy group, a halogen atom, a halogen-containing group, and a combination thereof,
wherein, in Chemical Formula 2,
each of R a to R l are independently one of hydrogen, a substituted or unsubstituted C 1 to C 30 alkyl group, a substituted or unsubstituted C 6 to C 30 aryl group, a substituted or unsubstituted C 3 to C 30 heteroaryl group, a halogen atom, a halogen-containing group, and a combination thereof, and
X is an anion.
2. The organic photoelectric device of claim 1 , wherein the compound represented by the above Chemical Formula 1 includes at least one selected from compounds represented by the following Chemical Formulae 1a to 1e:
wherein, in Chemical Formulae 1a to 1e,
each of R 1 and R 2 are independently one of hydrogen, a substituted or unsubstituted C 1 to C 30 alkyl group, a substituted or unsubstituted C 6 to C 30 aryl group, a substituted or unsubstituted C 3 t o C 30 heteroaryl group, and a combination thereof.
3. The organic photoelectric device of claim 1 , wherein at least one of R a to R l of Chemical Formula 2 includes a halogen atom.
4. The organic photoelectric device of claim 1 , wherein the compound represented by the above Chemical Formula 2 includes at least one of compounds represented by the following Chemical Formulae 2a to 2e:
5. The organic photoelectric device of claim 1 , wherein
the compound represented by the above Chemical Formula 1 is a p-type semiconductor, and
the compound represented by the above Chemical Formula 2 is an n-type semiconductor.
6. The organic photoelectric device of claim 1 , wherein the active layer selectively absorbs light at a green wavelength region.
7. The organic photoelectric device of claim 1 , wherein the active layer has a maximum absorption peak in a wavelength region of about 500 nm to about 600 nm.
8. The organic photoelectric device of claim 1 , wherein the active layer has a light-absorption curve having a full width at half maximum (FWHM) of about 50 nm to 150 nm.
9. The organic photoelectric device of claim 1 , wherein the active layer includes an intrinsic layer including the compound represented by the above Chemical Formula 1 and the compound represented by the above Chemical Formula 2 at a ratio of about 1:100 to about 100:1.
10. The organic photoelectric device of claim 9 , wherein the active layer includes the intrinsic layer including the compound represented by the above Chemical Formula 1 and the compound represented by the above Chemical Formula 2 at a ratio of about 1:10 to about 10:1.
11. The organic photoelectric device of claim 9 , wherein the active layer further comprises a p-type layer including the compound represented by the above Chemical Formula 1.
12. The organic photoelectric device of claim 9 , wherein the active layer further comprises an n-type layer including the compound represented by the above Chemical Formula 2.
13. The organic photoelectric device of claim 9 , wherein the active layer further comprises:
a p-type layer on one side of the intrinsic layer, the p-type layer including the compound represented by the above Chemical Formula 1, and
an n-type layer on the other side of the intrinsic layer, the n-type layer including the compound represented by the above Chemical Formula 2.
14. The organic photoelectric device of claim 1 , wherein the active layer comprises a p-type layer including the compound represented by the above Chemical Formula 1 and an n-type layer including the compound represented by the above Chemical Formula 2.
15. The organic photoelectric device of claim 1 , further comprising:
a charge auxiliary layer between at least one of the first electrode and the second electrode and the active layer.
16. The organic photoelectric device of claim 1 , wherein the first electrode is an anode and the second electrode is a cathode.
17. An image sensor comprising the organic photoelectric device according to claim 1 .
18. The organic photoelectric device of claim 1 , wherein
the compound represented by Chemical Formula 1 is a p-type semiconductor,
the compound represented by Chemical Formula 2 is an n-type semiconductor, and
the p-type semiconductor and the n-type semiconductor form a pn junction.