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 journalArticlepeer-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 languageEnglish
Pages (from-to)3946-3949
Number of pages4
JournalThin Solid Films
Volume519
Issue number11
DOIs
Publication statusPublished - 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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