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Proceedings Paper

Thermal characterization of nanoporous 'black silicon' surfaces
Author(s): Logan Nichols; Wenqi Duan; Fatima Toor
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Paper Abstract

In this work we characterize the thermal conductivity properties of nanoprous ‘black silicon’ (bSi). We fabricate the nanoporous bSi using the metal assisted chemical etching (MACE) process utilizing silver (Ag) metal as the etch catalyst. The MACE process steps include (i) electroless deposition of Ag nanoparticles on the Si surface using silver nitrate (AgNO3) and hydrofluoric acid (HF), and (ii) a wet etch in a solution of HF and hydrogen peroxide (H2O2). The resulting porosity of bSi is dependent on the ratio of the concentration of HF to (HF + H2O2); the ratio is denoted as rho (ρ). We find that as etch time of bSi increases the thermal conductivity of Si increases as well. We also analyze the absorption of the bSi samples by measuring the transmission and reflection using IR spectroscopy. This study enables improved understanding of nanoporous bSi surfaces and how they affect the solar cell performance due to the porous structures’ thermal properties.

Paper Details

Date Published: 26 September 2016
PDF: 7 pages
Proc. SPIE 9929, Nanostructured Thin Films IX, 99290K (26 September 2016); doi: 10.1117/12.2237042
Show Author Affiliations
Logan Nichols, The Univ. of Iowa (United States)
Wenqi Duan, The Univ. of Iowa (United States)
Fatima Toor, The Univ. of Iowa (United States)

Published in SPIE Proceedings Vol. 9929:
Nanostructured Thin Films IX
Akhlesh Lakhtakia; Tom G. Mackay; Motofumi Suzuki, Editor(s)

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