Here we report an experimental study about the controlled etching of macropores in n-type silicon electrodes at quasizero anodic voltage using hydrofluoric acid-based photo-electrochemical etching (P-ECE). This breaks a new ground on the controlled electrochemical dissolution of n-type silicon, for which the use of anodic voltage above the electropolishing peaks (VPS, JPS) has been considered to be a golden rule for the etching control, to date. Remarkably, our experimental results clearly show that it is possible to control the etching of macropores at anodic voltages well below (close to zero Volt) the electropolishing peak and that the use of low anodic voltages is beneficial for the fabrication of regular macropores for both larger diameters (e.g. 10 ?m ) and spatial pitches (e.g. 20 ?m).
QUASI-ZERO ANODIC VOLTAGE ETCHING OF MACROPORES IN N-TYPE SILICON
Lucanos STRAMBINI;Giuseppe BARILLARO
2018
Abstract
Here we report an experimental study about the controlled etching of macropores in n-type silicon electrodes at quasizero anodic voltage using hydrofluoric acid-based photo-electrochemical etching (P-ECE). This breaks a new ground on the controlled electrochemical dissolution of n-type silicon, for which the use of anodic voltage above the electropolishing peaks (VPS, JPS) has been considered to be a golden rule for the etching control, to date. Remarkably, our experimental results clearly show that it is possible to control the etching of macropores at anodic voltages well below (close to zero Volt) the electropolishing peak and that the use of low anodic voltages is beneficial for the fabrication of regular macropores for both larger diameters (e.g. 10 ?m ) and spatial pitches (e.g. 20 ?m).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
