Nanostructured GaAs solar cells via metal-assisted chemical etching of emitter layers

Yunwon Song, Keorock Choi, Dong Hwan Jun, Jungwoo Oh

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

GaAs solar cells with nanostructured emitter layers were fabricated via metal-assisted chemical etching. Au nanoparticles produced via thermal treatment of Au thin films were used as etch catalysts to texture an emitter surface with nanohole structures. Epi-wafers with emitter layers 0.5, 1.0, and 1.5 um in thickness were directly textured and a window layer removal process was performed before metal catalyst deposition. A nanohole-textured emitter layer provides effective light trapping capabilities, reducing the surface reflection of a textured solar cell by 11.0%. However, because the nanostructures have high surface area to volume ratios and large numbers of defects, various photovoltaic properties were diminished by high recombination losses. Thus, we have studied the application of nanohole structures to GaAs emitter solar cells and investigated the cells’ antireflection and photovoltaic properties as a function of the nanohole structure and emitter thickness. Due to decreased surface reflection and improved shunt resistance, the solar cell efficiency increased from 4.25% for non-textured solar cells to 7.15% for solar cells textured for 5 min.

Original languageEnglish
Pages (from-to)23862-23872
Number of pages11
JournalOptics Express
Volume25
Issue number20
DOIs
Publication statusPublished - 2017 Oct 2

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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