Texturing of the back reflector for light trapping enhancement in micromorph thin film solar cells

Kuang Chieh Lai; Fu Ji Tsai; Jen Hung Wang; Chih Hung Yeh; Mau Phon Houng

doi:10.1016/j.tsf.2011.01.360

Texturing of the back reflector for light trapping enhancement in micromorph thin film solar cells

Kuang Chieh Lai, Fu Ji Tsai, Jen Hung Wang, Chih Hung Yeh, Mau Phon Houng

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

The effects of textured back reflectors on light trapping in a-Si:H/μc-Si:H tandem cells are investigated with textured ZnO:Ga (GZO) back contacts obtained by surface wet etching. It is observed that rough back reflectors in fabricated tandem solar cells increase the short circuit current density of the bottom cells by 8%, which is attributed to light-trapping improvement. It is shown that enhanced longer wavelength light trapping is mainly attributable to improved light scattering at the back side by comparing identical a-Si:H/μc-Si:H tandem solar cells, both with a GZO back reflector but only one with a textured back reflector. The effectiveness of the textured GZO back reflector is also demonstrated in a textured a-Si:H/μc-Si:H tandem cell with a bottom cell thickness of 2 μm, which showed higher conversion efficiency than the reference cell.

Original language	English
Pages (from-to)	3946-3949
Number of pages	4
Journal	Thin Solid Films
Volume	519
Issue number	11
DOIs	https://doi.org/10.1016/j.tsf.2011.01.360
Publication status	Published - 2011 Mar 31

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Surfaces and Interfaces
Surfaces, Coatings and Films
Metals and Alloys
Materials Chemistry

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title = "Texturing of the back reflector for light trapping enhancement in micromorph thin film solar cells",

abstract = "The effects of textured back reflectors on light trapping in a-Si:H/μc-Si:H tandem cells are investigated with textured ZnO:Ga (GZO) back contacts obtained by surface wet etching. It is observed that rough back reflectors in fabricated tandem solar cells increase the short circuit current density of the bottom cells by 8%, which is attributed to light-trapping improvement. It is shown that enhanced longer wavelength light trapping is mainly attributable to improved light scattering at the back side by comparing identical a-Si:H/μc-Si:H tandem solar cells, both with a GZO back reflector but only one with a textured back reflector. The effectiveness of the textured GZO back reflector is also demonstrated in a textured a-Si:H/μc-Si:H tandem cell with a bottom cell thickness of 2 μm, which showed higher conversion efficiency than the reference cell.",

author = "Lai, {Kuang Chieh} and Tsai, {Fu Ji} and Wang, {Jen Hung} and Yeh, {Chih Hung} and Houng, {Mau Phon}",

note = "Funding Information: This work was supported by the National Science Council of Taiwan under Contract number NSC-99-2221-E-006-212 .",

year = "2011",

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doi = "10.1016/j.tsf.2011.01.360",

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AU - Lai, Kuang Chieh

AU - Tsai, Fu Ji

AU - Wang, Jen Hung

AU - Yeh, Chih Hung

AU - Houng, Mau Phon

N1 - Funding Information: This work was supported by the National Science Council of Taiwan under Contract number NSC-99-2221-E-006-212 .

PY - 2011/3/31

Y1 - 2011/3/31

N2 - The effects of textured back reflectors on light trapping in a-Si:H/μc-Si:H tandem cells are investigated with textured ZnO:Ga (GZO) back contacts obtained by surface wet etching. It is observed that rough back reflectors in fabricated tandem solar cells increase the short circuit current density of the bottom cells by 8%, which is attributed to light-trapping improvement. It is shown that enhanced longer wavelength light trapping is mainly attributable to improved light scattering at the back side by comparing identical a-Si:H/μc-Si:H tandem solar cells, both with a GZO back reflector but only one with a textured back reflector. The effectiveness of the textured GZO back reflector is also demonstrated in a textured a-Si:H/μc-Si:H tandem cell with a bottom cell thickness of 2 μm, which showed higher conversion efficiency than the reference cell.

AB - The effects of textured back reflectors on light trapping in a-Si:H/μc-Si:H tandem cells are investigated with textured ZnO:Ga (GZO) back contacts obtained by surface wet etching. It is observed that rough back reflectors in fabricated tandem solar cells increase the short circuit current density of the bottom cells by 8%, which is attributed to light-trapping improvement. It is shown that enhanced longer wavelength light trapping is mainly attributable to improved light scattering at the back side by comparing identical a-Si:H/μc-Si:H tandem solar cells, both with a GZO back reflector but only one with a textured back reflector. The effectiveness of the textured GZO back reflector is also demonstrated in a textured a-Si:H/μc-Si:H tandem cell with a bottom cell thickness of 2 μm, which showed higher conversion efficiency than the reference cell.

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JO - Thin Solid Films

JF - Thin Solid Films

SN - 0040-6090

IS - 11

ER -

Texturing of the back reflector for light trapping enhancement in micromorph thin film solar cells

Abstract

All Science Journal Classification (ASJC) codes

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