Organic photoelectric device, and image sensor and electronic device including the same
An organic photoelectric device includes a first electrode and a second electrode facing each other and a photoelectric conversion layer between the first electrode and the second electrode, wherein the photoelectric conversion layer includes a p-type semiconductor compound and an n-type semiconductor compound, and the organic photoelectric device satisfies Equation 1, and has external quantum efficiency (EQE) of greater than or equal to about 40% at −3 V.
1. An organic photoelectric device, comprising:
a first electrode and a second electrode facing each other, and a photoelectric conversion layer, between the first electrode and the second electrode,
wherein the photoelectric conversion layer includes a p-type semiconductor compound and an n-type semiconductor compound,
the organic photoelectric device satisfies the following Equation 1 and has an external quantum efficiency (EQE) that is greater than or equal to about 40% at −3 V,
the p-type semiconductor compound includes an indandione-based compound and the n-type semiconductor compound includes fullerene or a fullerene derivative, and
when the volumes of the p-type semiconductor compound and the n-type semiconductor compound are referred to as p and n, respectively, n/p is in a range of about 0.5<n/p≦about2:
(
EQE
at
-
3
V
)
(
EQE
at
-
2
V
)
EQE
at
-
3
V
≤
0.1
.
[
Equation
1
]
2. An organic photoelectric device, comprising:
a first electrode and a second electrode facing each other, and a photoelectric conversion layer, between the first electrode and the second electrode,
wherein the photoelectric conversion layer includes a p-type semiconductor compound and an n-type semiconductor compound,
the organic photoelectric device satisfies the following Equation 1 and has an external quantum efficiency (EQE) that is greater than or equal to about 40% at −3 V, the indandione-based compound is represented by the following Chemical Formula 1:
wherein, in Chemical Formula 1,
Ar 1 and Ar 2 are independently a phenyl group or a naphthyl group, provided that at least one of Ar 1 and Ar 2 is a naphthyl group,
R 1 to R 4 are independently hydrogen, a C1 to C6 alkyl group, a C1 to C6 haloalkyl group, a halogen, or CN,
n is 0 or 1,
m is an integer ranging from 1 to 3.
3. The organic photoelectric device of claim 1 , wherein the p-type semiconductor compound is represented by the following Chemical Formula 1-1:
wherein, in Chemical Formula 1-1,
R 1 to R 4 are independently hydrogen, a C1 to C6 alkyl group, a C1 to C6 haloalkyl group, a halogen, or CN,
R a to R c are independently hydrogen, a C1 to C6 alkyl group, a C1 to C6 haloalkyl group, a halogen, or CN,
p, q, and r are integers ranging from 1 to 3, and
m is an integer ranging from 1 to 3.
4. The organic photoelectric device of claim 1 , wherein the p-type semiconductor compound is represented by the following Chemical Formula 1-2:
wherein, in Chemical Formula 1-2,
R 1 to R 4 are independently hydrogen, a C1 to C6 alkyl group, a C1 to C6 haloalkyl group, a halogen, or CN,
R a to R d are independently hydrogen, a C1 to C6 alkyl group, a C1 to C6 haloalkyl group, a halogen, or CN,
p, q, r, and s are integers ranging from 1 to 3, and
m is an integer ranging from 1 to 3.
5. The organic photoelectric device of claim 1 , wherein the p-type semiconductor compound is represented by the following Chemical Formula 1-3:
wherein, in Chemical Formula 1-3,
R 1 to R 4 are independently hydrogen, a C1 to C6 alkyl group, a C1 to C6 haloalkyl group, a halogen, or CN,
R a to R c are independently hydrogen, a C1 to C6 alkyl group, a C1 to C6 haloalkyl group, a halogen, or CN,
p, q, and r are integers ranging from 1 to 3, and
m is an integer ranging from 1 to 3.
6. The organic photoelectric device of claim 1 , wherein a light absorption curve of the p-type semiconductor compound has a full width at half maximum (FWHM) of about 50 nm to about 110 nm in a thin film state.
7. The organic photoelectric device of claim 1 , wherein the p-type semiconductor compound has a maximum absorption wavelength (λ max ) between about 500 nm and about 600 nm.
8. The organic photoelectric device of claim 1 , wherein the fullerene or the fullerene derivative is one of C60, a C60 derivative, C70, a C70 derivative, and a combination thereof.
9. The organic photoelectric device of claim 1 , wherein when the volumes of the p-type semiconductor compound and the n-type semiconductor compound are referred to as p and n, respectively, n/p is in a range of about 0.7≦n/p≦5 about 1.8.
10. The organic photoelectric device of claim 1 , wherein the p-type semiconductor compound comprises a metal-free phthalocyanine, and the n-type semiconductor compound comprises fullerene or a fullerene derivative.
11. The organic photoelectric device of claim 10 , wherein the metal-free phthalocyanine is represented by the following Chemical Formula 2:
wherein, in Chemical Formula 2,
R 11 to R 13 are independently hydrogen, a substituted or unsubstituted C1 to C30 aliphatic hydrocarbon group, a substituted or unsubstituted C6 to C30 aromatic hydrocarbon group, a substituted or unsubstituted C1 to C30 aliphatic heterocyclic group, a substituted or unsubstituted C2 to C30 aromatic heterocyclic group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C1 to C30 aryloxy group, a thio group, an arylthio group, an arylthio group, a cyano group, a cyano-containing group, a halogen, a halogen-containing group, a substituted or unsubstituted sulfonyl group, a substituted or unsubstituted aminosulfonyl group, a substituted or unsubstituted arylsulfonyl group, or a combination thereof,
a, b, and c are integers ranging from 1 to 3,
X is —F, —OR 22 , —N(R 23 )(R 24 ), or —OSi(R 25 )(R 26 )(R 27 ),
R 22 is a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heteroaryl group, a substituted or unsubstituted silyl group, or a combination thereof,
R 23 and R 24 are independently a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heteroaryl group, a substituted or unsubstituted silyl group, or a combination thereof, and
R 25 , R 26 , and R 27 are independently a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heterocyclic group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted amine group, a substituted or unsubstituted C6 to C30 arylamine group, a substituted or unsubstituted silyl group, or a combination thereof.
12. The organic photoelectric device of claim 10 , wherein the fullerene or the fullerene derivative is one of C60, a C60 derivative, C70, a C70 derivative, and a combination thereof.
13. The organic photoelectric device of claim 10 , wherein when the volumes of the p-type semiconductor compound and the n-type semiconductor compound are referred to as p and n, respectively, n/p is in a range of about 1<n/p≦about 3.
14. The organic photoelectric device of claim 1 , wherein the photoelectric conversion layer comprises an intrinsic layer including the p-type semiconductor compound and the n-type semiconductor compound.
15. The organic photoelectric device of claim 1 , wherein the photoelectric conversion layer further comprises at least one of a p-type layer on one side of the intrinsic layer and an n-type layer positioned on the other side of the intrinsic layer.
16. An image sensor comprising the organic photoelectric device of claim 1 .
17. The image sensor of claim 16 , further comprising:
a semiconductor substrate integrated with one or more first photo-sensing devices configured to sense light in a blue wavelength region and one or more second photo-sensing devices configured to sense light in a red wavelength region,
a color filter layer on the semiconductor substrate and including a blue filter configured to selectively absorb light in a blue wavelength region and a red filter configured to selectively absorb light in a red wavelength region, and
the organic photoelectric device on the color filter layer and configured to selectively absorb light in a green wavelength region.
18. An electronic device comprising the image sensor of claim 16 .