Towards the understanding of formation of micro/nano holes of Ge/GeO2 through phase mapping

Abstract

Here, we report for the first time a simple thermal oxidation strategy for the large area synthesis of Ge/GeO₂ nanoholes from Ge and studied the luminescence of Ge/GeO₂ and hole formation mechanism through phase and luminescence mapping. Photoluminescence mapping reveals that the emission in the visible range is only from the hole region, which provokes the necessity of the nanoholes. Such materials can also be used to convert ultraviolet to visible radiation for detection by conventional phototubes and to coat blue or ultraviolet diodes to obtain white light.