Period-mismatched sine dual-interface grating for optical absorption in silicon thin-film solar cells

Hongmei Zheng; Yingchun Yu; Rui Wu; Sheng Wu; Shunhua Chen; Ke Chen

doi:10.1364/AO.408812

Applied Optics
Vol. 59,
Issue 33,
pp. 10330-10338
(2020)
•https://doi.org/10.1364/AO.408812

Period-mismatched sine dual-interface grating for optical absorption in silicon thin-film solar cells

Hongmei Zheng, Yingchun Yu, Rui Wu, Sheng Wu, Shunhua Chen, and Ke Chen

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Hongmei Zheng, Yingchun Yu, Rui Wu, Sheng Wu, Shunhua Chen, and Ke Chen, "Period-mismatched sine dual-interface grating for optical absorption in silicon thin-film solar cells," Appl. Opt. 59, 10330-10338 (2020)

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- Diffraction and Gratings
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About this Article
History
- Original Manuscript: September 1, 2020
- Revised Manuscript: October 12, 2020
- Manuscript Accepted: October 12, 2020
- Published: November 16, 2020

Abstract

Crystalline silicon thin-film solar cells with period-mismatched sine dual-interface gratings are proposed. Several structural parameters of the front and rear gratings, such as heights, periods, and duty ratios, are optimized using the finite-difference time-domain method. The mechanisms of absorption enhancement are also illustrated by analyzing the optical and electrical performance in thin-film solar cells with different grating arrangements. Numerical results indicate that the period-mismatched sine dual-interface grating structure shows obvious improvement in absorption efficiency and is more suitable for grating structures with small period. The short-circuit current density of the period-mismatched dual-interface sine grating structure is improved to ${18.89}\;{{{\rm mA}/{\rm cm}}^2}$, an increase of 41.39% as compared with the planar structure. The research findings can be utilized to guide the design of grating structures for thin-film solar cells.

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$Q_{1}$ (nm)	C_Rec-Grating			M_Rec-Grating
$Q_{1}$ (nm)	$H$ (nm)	$ω_{d c 1} = ω_{d c 2}$	$J_{s c}$ ( $m A / {c m}^{2}$ )	$H$ (nm)	$n$	$ω_{d c 1}$	$ω_{d c 2}$	$J_{s c}$ ( $m A / {c m}^{2}$ )
200	60	0.4	16.29	60	2.4	0.4	0.2	18.77
300	60	0.4	17.45	60	1.6	0.4	0.2	20.01
400	60	0.2	18.44	60	1.2	0.4	0.2	19.56
500	60	0.2	19.32	60	1.2	0.2	0.2	19.20
600	60	0.2	19.64	60	1.0	0.4	0.2	19.82

$Q_{1}$ (nm)	C_Sin-Grating			M_Sin-Grating
$Q_{1}$ (nm)	$H$ (nm)	$ω_{d c 1} = ω_{d c 2}$	$J_{s c}$ ( $m A / {c m}^{2}$ )	$H$ (nm)	$n$	$ω_{d c 1}$	$ω_{d c 2}$	$J_{s c}$ ( $m A / {c m}^{2}$ )
200	80	0.6	15.83	60	2.2	0.2	0.6	19.62
300	80	0.4	17.20	80	1.6	0.4	0.6	20.25
400	60	0.2	18.45	80	1.2	0.4	0.6	19.88
500	80	0.4	19.11	80	1.6	0.2	0.8	19.69
600	80	0.4	18.27	80	1.2	0.2	0.8	19.64

		p Region	i Region	n Region
Band parameters	$E_{g}$ (eV)	1.1	1.1	1.1
	$N_{c}$ , $N_{v}$	$1.04 \times 10^{19}$ , $2.8 \times 10^{19}$	$1.04 \times 10^{19}$ , $2.8 \times 10^{19}$	$1.04 \times 10^{19}$ , $2.8 \times 10^{19}$
	$ε$ , $χ$ (eV)	11.7, 4.05	11.7, 4.05	11.7, 4.05
Boltzmann constant	$K_{B}$ (J/K)	$1.38 \times 10^{- 23}$	$1.38 \times 10^{- 23}$	$1.38 \times 10^{- 23}$
Temperature	$T$ (K)	300	300	300
Mobility	$μ_{n}$ , $μ_{p}$ ( ${c m}^{2} / V \cdot s$ )	1450, 500	1450, 500	1450, 500
Doping	$N_{a}$ , $N_{d}$ ( ${c m}^{- 3}$ )	$1 \times 10^{20}$ , 0	$1 \times 10^{12}$ , 0	$1 \times 10^{20}$ , 0
Auger recombination rates	$C_{n}$ , $C_{p}$	$2.8 \times 10^{- 13}$ , $9.9 \times 10^{- 32}$	$2.8 \times 10^{- 13}$ , $9.9 \times 10^{- 32}$	$2.8 \times 10^{- 13}$ , $9.9 \times 10^{- 32}$

TFSCs	$J_{s c}$ ( $m A / {c m}^{2}$ )	$V_{o c}$ (V)
Planar	13.36	0.62
C_Sin-Grating	17.98	0.61
C_Rec-Grating	18.34	0.61
M_Rec-Grating	18.66	0.61
M_Sin-Grating	18.89	0.61

$Q_{1}$ (nm)	C_Rec-Grating			M_Rec-Grating
$Q_{1}$ (nm)	$H$ (nm)	$ω_{d c 1} = ω_{d c 2}$	$J_{s c}$ ( $m A / {c m}^{2}$ )	$H$ (nm)	$n$	$ω_{d c 1}$	$ω_{d c 2}$	$J_{s c}$ ( $m A / {c m}^{2}$ )
200	60	0.4	16.29	60	2.4	0.4	0.2	18.77
300	60	0.4	17.45	60	1.6	0.4	0.2	20.01
400	60	0.2	18.44	60	1.2	0.4	0.2	19.56
500	60	0.2	19.32	60	1.2	0.2	0.2	19.20
600	60	0.2	19.64	60	1.0	0.4	0.2	19.82

Abstract

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Applied Optics