Effective light trapping in c-Si thin-film solar cells with a dual-layer split grating

Ke Chen; Nianhong Zheng; Sheng Wu; Jinyang He; Yingchun Yu; Hongmei Zheng

doi:10.1364/AO.443307

Applied Optics
Vol. 60,
Issue 33,
pp. 10312-10321
(2021)
•https://doi.org/10.1364/AO.443307

Effective light trapping in c-Si thin-film solar cells with a dual-layer split grating

Ke Chen, Nianhong Zheng, Sheng Wu, Jinyang He, Yingchun Yu, and Hongmei Zheng

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Ke Chen, Nianhong Zheng, Sheng Wu, Jinyang He, Yingchun Yu, and Hongmei Zheng, "Effective light trapping in c-Si thin-film solar cells with a dual-layer split grating," Appl. Opt. 60, 10312-10321 (2021)

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Abstract

We propose a dual-layer split nanograting structure in crystalline silicon thin-film solar cells (TFSCs). The split nanograting is designed by introducing two partitioning factors and split times. By employing the finite-difference time-domain method, the light trapping performance and relevant parameters of TFSCs are analyzed and optimized. Numerical computation of optical and electrical simulation shows that the optimal dual-layer split nanograting structure has demonstrated great enhanced light absorption compared with the planar structure. Enhancement of the light trapping effect is associated with light coupling to waveguide modes. The short-circuit current density is reached at ${21.66}\;{{\rm mA/cm}^2}$ with an improvement of 54.6% over the planar structure. All results provide a parting thought for the design of TFSC grating structures.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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		PS-Grating		PA-Grating
$N_{1}$	$N_{2}$	$a = b = c = d$	$J_{p h} (m A / {c m}^{2})$	$a = c$	$b = d$	$J_{p h} (m A / {c m}^{2})$
2	2	0.75	17.95	0.63	0.88	19.16
3	3	0.91	19.27	0.73	1	20.70

		MS-Grating			MA-Grating
$N_{1}$	$N_{2}$	$a = b$	$c = d$	$J_{p h} (m A / {c m}^{2})$	$a$	$b$	$c$	$d$	$J_{p h} (m A / {c m}^{2})$
2	2	0.75	0.61	18.84	0.54	0.98	0.93	0.57	20.40
2	3	0.75	0.62	18.95	0.79	0.81	0.66	0.88	20.60
3	2	0.97	0.63	20.32	0.69	1	1	0.58	21.76
3	3	0.97	0.66	20.58	1	0.68	0.69	0.72	22.27

		$p$ region	$i$ region	$n$ region
Band parameters	$E_{g}$ (eV)	1.12	1.12	1.12
	$N_{c} ({c m}^{- 3})$	$1.04 \times 10^{19}$	$1.04 \times 10^{19}$	$1.04 \times 10^{19}$
	$N_{v} ({c m}^{- 3})$	$2.8 \times 10^{19}$	$2.8 \times 10^{19}$	$2.8 \times 10^{19}$
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	$N_{a}, N_{d} ({c m}^{- 3})$	$1 \times 10^{20}, 0$	$0, 1 \times 10^{12}$	$1 \times 10^{20}, 0$
Auger recombination rates	$C_{n} ({c m}^{6} / s)$	$2.8 \times 10^{- 31}$	$2.8 \times 10^{- 31}$	$2.8 \times 10^{- 31}$
	$C_{p} ({c m}^{6} / s)$	$9.9 \times 10^{- 32}$	$9.9 \times 10^{- 32}$	$9.9 \times 10^{- 32}$

TFSCs	$J_{s c} (m A / {c m}^{2})$	$V_{o c} (m V)$	$F F (%)$	$η (%)$	$P_{max} (m W / {c m}^{2})$
Planar	14.01	568	81.93	6.52	6.52
PS_ (3,3)	18.28	561	82.08	8.41	8.41
PA_ (3,3)	20.25	567	81.78	9.39	9.39
MS_ (3,3)	19.77	568	82.11	9.22	9.22
MA_ (3,3)	21.66	568	81.93	10.08	10.08

		PS-Grating		PA-Grating
$N_{1}$	$N_{2}$	$a = b = c = d$	$J_{p h} (m A / {c m}^{2})$	$a = c$	$b = d$	$J_{p h} (m A / {c m}^{2})$
2	2	0.75	17.95	0.63	0.88	19.16
3	3	0.91	19.27	0.73	1	20.70

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Equations (9)

Applied Optics