Heterogeneous optoelectronic characteristics of Si micropillar arrays fabricated by metal-assisted chemical etching.

ABSTRACT: Recent progress achieved in metal-assisted chemical etching (MACE) has enabled the production of high-quality micropillar arrays for various optoelectronic applications. Si micropillars produced by MACE often show a porous Si/SiO_x shell on crystalline pillar cores introduced by local electrochemical reactions. In this paper, we report the distinct optoelectronic characteristics of the porous Si/SiO_x shell correlated to their chemical compositions. Local photoluminescent (PL) images obtained with an immersion oil objective lens in confocal microscopy show a red emission peak (≈ 650 nm) along the perimeter of the pillars that is threefold stronger compared to their center. On the basis of our analysis, we find an unexpected PL increase (≈ 540 nm) at the oil/shell interf

SUBMITTER: Qian Y 

PROVIDER: S-EPMC7530667 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature