Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (3): 518.doi: 10.7503/cjcu20180550
• Physical Chemistry • Previous Articles Next Articles
ZHOU Hegen1,2, JIN Hua1, GUO Huirui1, LIN Jing2, ZHANG Yongfan2,*()
Received:
2019-08-03
Online:
2019-01-24
Published:
2019-01-24
Contact:
ZHANG Yongfan
E-mail:zhangyf@fzu.edu.cn
Supported by:
CLC Number:
TrendMD:
ZHOU Hegen,JIN Hua,GUO Huirui,LIN Jing,ZHANG Yongfan. Electronic Structures and Optical Properties of Cu-based Semiconductors with Chalcopyrite-type Structure†[J]. Chem. J. Chinese Universities, 2019, 40(3): 518.
Crystal | a/nm | c/nm | Volume/nm3 | Eg/eV | Ref. | Scissor/eV | ||||
---|---|---|---|---|---|---|---|---|---|---|
Exp. | Cal. | Exp. | Cal. | Exp. | Cal. | Exp. | Cal. | |||
CuGaS2 | 0.5360 | 0.5368 | 1.0491 | 1.0561 | 0.2995 | 0.3069 | 2.43 | 0.669 | [ | 1.761 |
CuGaSe2 | 0.5614 | 0.5667 | 1.1022 | 1.1258 | 0.3474 | 0.3615 | 1.68 | 0.053 | [ | 1.627 |
CuGaTe2 | 0.6024 | 0.6083 | 1.1940 | 1.2156 | 0.4332 | 0.4498 | 1.24 | 0.225 | [ | 1.015 |
CuInS2 | 0.5523 | 0.5592 | 1.1122 | 1.1243 | 0.3392 | 0.3516 | 1.53 | 0.022 | [ | 1.508 |
CuInSe2 | 0.5782 | 0.5874 | 1.1617 | 1.1786 | 0.3884 | 0.4067 | 1.04 | 0.015 | [ | 1.025 |
CuInTe2 | 0.6194 | 0.6283 | 1.2416 | 1.2621 | 0.4764 | 0.4982 | 1.06 | 0.001 | [ | 1.059 |
Table 1 Experimental and theoretical results of cell parameters and band gaps of CuXY2 crystals
Crystal | a/nm | c/nm | Volume/nm3 | Eg/eV | Ref. | Scissor/eV | ||||
---|---|---|---|---|---|---|---|---|---|---|
Exp. | Cal. | Exp. | Cal. | Exp. | Cal. | Exp. | Cal. | |||
CuGaS2 | 0.5360 | 0.5368 | 1.0491 | 1.0561 | 0.2995 | 0.3069 | 2.43 | 0.669 | [ | 1.761 |
CuGaSe2 | 0.5614 | 0.5667 | 1.1022 | 1.1258 | 0.3474 | 0.3615 | 1.68 | 0.053 | [ | 1.627 |
CuGaTe2 | 0.6024 | 0.6083 | 1.1940 | 1.2156 | 0.4332 | 0.4498 | 1.24 | 0.225 | [ | 1.015 |
CuInS2 | 0.5523 | 0.5592 | 1.1122 | 1.1243 | 0.3392 | 0.3516 | 1.53 | 0.022 | [ | 1.508 |
CuInSe2 | 0.5782 | 0.5874 | 1.1617 | 1.1786 | 0.3884 | 0.4067 | 1.04 | 0.015 | [ | 1.025 |
CuInTe2 | 0.6194 | 0.6283 | 1.2416 | 1.2621 | 0.4764 | 0.4982 | 1.06 | 0.001 | [ | 1.059 |
Fig.3 Total and partial density of states(DOSs) of CuGaTe2(A1—A4) and CuInTe2(B1—B4) crystals (A1, B1) Total; (A2, B2) Cu; (A3) Ga; (B3) In; (A4, B4) Te. The zero energy is set to Fermi level(EF).
Fig.4 Variations of the real part(A)—(F) and imaginary part(G)—(L) of dielectric function of CuXY2 crystals(A, G) CuGaS2; (B, H) CuGaSe2; (C, I) CuGaTe2; (D, J) CuInS2; (E, K) CuInSe2; (F, L) CuInTe2.
Fig.6 Variations of reflectivity of CuGaS2(A), CuGaSe2(B) and CuGaTe2(C) crystals Rx and Rz are the reflectivity along x and z directions, respectively.
Fig.7 Variations of real part of photoconductivity of CuGaS2(A), CuGaSe2(B), CuGaTe2(C), CuInS2(D), CuInSe2(E) and CuInTe2(F) crystalsσx and σz are the photoconductivity along x and z directions, respectively.
Crystal | Refractive index at zero frequency | d36/(pm·V-1) at wavelength of 10.6 μm | ||||
---|---|---|---|---|---|---|
This work | Other works | Exp. | This work | Other works | Exp. | |
CuGaS2 | 2.70 | 2.77[ | 2.5—3.05[ | 13.06 | 11.35[ | 14.5±15%[ |
2.62[ | 2.2—2.9[ | |||||
CuGaSe2 | 2.93 | 3.69[ | 2.34—3.38[ | 28.74 | 27.75[ | 30.0±10%[ |
2.82[ | ||||||
CuGaTe2 | 3.35 | 4.99[ | | 114.87 | 70.00[ | |
CuInS2 | 2.98 | 3.22[ | 2.38—2.82[ | 17.87 | 15.85[ | 10.6±15%[ |
2.76[ | 1.6—3[ | |||||
CuInSe2 | 3.32 | 3.54[ | 2.04—3.12[ | 60.16 | 36.25[ | |
3.10[ | ||||||
CuInTe2 | 3.76 | 4.98[ | | 82.02 | 63.00[ | |
3.05[ |
Table 2 Experimental and theoretical values of refractive index and d36 of CuXY2 crystals
Crystal | Refractive index at zero frequency | d36/(pm·V-1) at wavelength of 10.6 μm | ||||
---|---|---|---|---|---|---|
This work | Other works | Exp. | This work | Other works | Exp. | |
CuGaS2 | 2.70 | 2.77[ | 2.5—3.05[ | 13.06 | 11.35[ | 14.5±15%[ |
2.62[ | 2.2—2.9[ | |||||
CuGaSe2 | 2.93 | 3.69[ | 2.34—3.38[ | 28.74 | 27.75[ | 30.0±10%[ |
2.82[ | ||||||
CuGaTe2 | 3.35 | 4.99[ | | 114.87 | 70.00[ | |
CuInS2 | 2.98 | 3.22[ | 2.38—2.82[ | 17.87 | 15.85[ | 10.6±15%[ |
2.76[ | 1.6—3[ | |||||
CuInSe2 | 3.32 | 3.54[ | 2.04—3.12[ | 60.16 | 36.25[ | |
3.10[ | ||||||
CuInTe2 | 3.76 | 4.98[ | | 82.02 | 63.00[ | |
3.05[ |
Fig.8 Variations of d36 coefficient as a function of the numbers of occupied bands of CuGaS2(a) and CuInS2(b)(A), CuGaSe2(a) and CuInSe2(b)(B), CuGaTe2(a) and CuInTe2(b)(C) crystalsThe index of HOCO is 26, and the d36 magnitude is obtained by considering a total of 34 unoccupied energy bands.
Fig.10 Correlations between d36 coefficients and the occupied(A1—A4)/ unoccupied(B1—B4) DOSs of CuGaS2 crystals(A1, B1) Cu; (A2, B2) Ga; (A3, B3) S; (A4, B4) d36. The zero energy is set to EF, and the d36 magnitude at a certain energy level(E) is obtained by considering all the occupied/unoccupied bands distributed in the region between E and EF.
Fig.11 Variations of d36 coefficient as a function of the numbers of unoccupied bands of CuXY2The index of the LUCO is 27, and the d36 magnitude is obtained by considering a total of 26 occupied energy bands.
Fig.12 3D charge density maps of unoccupied bands from the 32nd to 36th of CuGaY2(A) CuGaS2; (B) CuGaSe2; (C) CuGaTe2. The corresponding isovalue is 6.0 e/nm3.
Fig.13 Frequency-dependent variations of the d36 coefficients of CuGaY2(A) and CuInY2(B) crystals (A) a. CuGaS2; b. CuGaSe2; c. CuGaTe2. (B) a. CuInS2; b. CuInSe2; c. CuInTe2.
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