Determination of the basic optical parameters of ZnSnN<sub>2</sub>

Fuling Deng; Hongtao Cao; Lingyan Liang; Jun Li; Junhua Gao; Hongliang Zhang; Ruifeng Qin; Caichi Liu

doi:10.1364/OL.40.001282

Optics Letters
Vol. 40,
Issue 7,
pp. 1282-1285
(2015)
•https://doi.org/10.1364/OL.40.001282

Determination of the basic optical parameters of ZnSnN₂

Fuling Deng, Hongtao Cao, Lingyan Liang, Jun Li, Junhua Gao, Hongliang Zhang, Ruifeng Qin, and Caichi Liu

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Fuling Deng, Hongtao Cao, Lingyan Liang, Jun Li, Junhua Gao, Hongliang Zhang, Ruifeng Qin, and Caichi Liu, "Determination of the basic optical parameters of ZnSnN₂," Opt. Lett. 40, 1282-1285 (2015)

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Abstract

Polycrystalline ${ZnSnN}_{2}$ thin films were successfully prepared by DC magnetron sputtering at room temperature. Both the as-deposited and annealed films showed n-type conduction, with electron concentration varying between $1.6 \times 10^{18}$ and $2.3 \times 10^{17} {cm}^{- 3}$ and the maximum mobility of $3.98 {cm}^{2} V^{- 1} s^{- 1}$ . The basic optical parameters such as the refraction index, extinction coefficient, and absorption coefficient were precisely determined through the spectroscopic ellipsometry measurement and analysis. The optical bandgap of the ${ZnSnN}_{2}$ films was calculated to around 1.9 eV, with the absorption coefficient greater than $10^{4} {cm}^{- 1}$ at wavelengths less than 845 nm. The easy-fabricated ${ZnSnN}_{2}$ possesses a sound absorption coefficient ranging from the ultraviolet through visible light and into the near-infrared, comparable to some typical photovoltaic materials such as GaAs, CdTe, and InP.

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	Calculated [9] (Å)	Experimental (Å)	Ref. [22] (Å)
a	5.80	$5.853 \pm 0.009$	$5.842 \pm 0.007$
b	6.70	$6.741 \pm 0.014$	$6.753 \pm 0.006$
c	5.53	$5.498 \pm 0.012$	$5.462 \pm 0.003$

Sample	$t_{f}$	$t_{r}$	$A_{1}$	$E_{g 1}$	$E_{01}$	$C_{1}$	$A_{2}$	$E_{g 2}$	$E_{02}$	$C_{2}$	MSE	$n$
as-dep.	856.3	10.8	32.35	2.66	1.28	3.31	105.7	2.38	6.70	13.44	3.85	2.41
300°C	856.9	14.4	34.39	2.66	1.22	3.31	163.9	2.65	8.49	13.57	4.15	2.23
400°C	857.2	16.6	41.23	2.66	1.23	3.31	149.7	2.88	9.87	16.55	4.19	2.20

	Calculated [9] (Å)	Experimental (Å)	Ref. [22] (Å)
a	5.80	$5.853 \pm 0.009$	$5.842 \pm 0.007$
b	6.70	$6.741 \pm 0.014$	$6.753 \pm 0.006$
c	5.53	$5.498 \pm 0.012$	$5.462 \pm 0.003$

Sample	$t_{f}$	$t_{r}$	$A_{1}$	$E_{g 1}$	$E_{01}$	$C_{1}$	$A_{2}$	$E_{g 2}$	$E_{02}$	$C_{2}$	MSE	$n$
as-dep.	856.3	10.8	32.35	2.66	1.28	3.31	105.7	2.38	6.70	13.44	3.85	2.41
300°C	856.9	14.4	34.39	2.66	1.22	3.31	163.9	2.65	8.49	13.57	4.15	2.23
400°C	857.2	16.6	41.23	2.66	1.23	3.31	149.7	2.88	9.87	16.55	4.19	2.20

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Optics Letters