Thermal characterization of nanoporous 'black silicon' surfaces

Logan Nichols; Wenqi Duan; Fatima Toor

doi:10.1117/12.2237042

26 September 2016 Thermal characterization of nanoporous 'black silicon' surfaces

Logan Nichols, Wenqi Duan, Fatima Toor

Proceedings Volume 9929, Nanostructured Thin Films IX; 99290K (2016) https://doi.org/10.1117/12.2237042
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

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.

Conference Presentation

Citation Download Citation

Logan Nichols, Wenqi Duan, and Fatima Toor "Thermal characterization of nanoporous 'black silicon' surfaces", Proc. SPIE 9929, Nanostructured Thin Films IX, 99290K (26 September 2016); https://doi.org/10.1117/12.2237042

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