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Proceedings Paper

Nanosphere lithography for improved absorption in thin crystalline silicon solar cells
Author(s): Yuanchih Chang; David N. R. Payne; Michael E. Pollard; Supriya Pillai; Darren M. Bagnall
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Paper Abstract

Over the last decade, plasmonic nanoparticle arrays have been extensively studied for their light trapping potential in thin film solar cells. However, the commercial use of such arrays has been limited by complex and expensive fabrication techniques such as e-beam lithography. Nanosphere lithography (NSL) is a promising low-cost alternative for forming regular arrays of nanoscale features. Here, we use finite-difference time-domain (FDTD) simulations to determine the optical enhancement due to nanosphere arrays embedded at the rear of a complete thin film device. Array parameters including the nanosphere pitch and diameter are explored, with the FDTD model itself first validated by comparing simulations of Ag nanodisc arrays with optical measurements of pre-existing e-beam fabricated test structures. These results are used to guide the development of a nanosphere back-reflector for 20 μm thin crystalline silicon cells. The deposition of polystyrene nanosphere monolayers is optimized to provide uniform arrays, which are subsequently incorporated into preliminary, proof of concept device structures. Absorption and photoluminescence measurements clearly demonstrate the potential of nanosphere arrays for improving the optical response of a solar cell using economical and scalable methods.

Paper Details

Date Published: 22 December 2015
PDF: 10 pages
Proc. SPIE 9668, Micro+Nano Materials, Devices, and Systems, 966849 (22 December 2015); doi: 10.1117/12.2202453
Show Author Affiliations
Yuanchih Chang, The Univ. of New South Wales (Australia)
David N. R. Payne, The Univ. of New South Wales (Australia)
Michael E. Pollard, The Univ. of New South Wales (Australia)
Supriya Pillai, The Univ. of New South Wales (Australia)
Darren M. Bagnall, The Univ. of New South Wales (Australia)

Published in SPIE Proceedings Vol. 9668:
Micro+Nano Materials, Devices, and Systems
Benjamin J. Eggleton; Stefano Palomba, Editor(s)

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