Transient lateral photovoltaic effect in patterned metal-oxide-semiconductor films

TL;DR

This study investigates the transient lateral photovoltaic effect in patterned metal-oxide-semiconductor films, revealing linear position dependence and sign change phenomena, with implications for enhancing the spatial and temporal resolution of position-sensitive detectors.

Contribution

It introduces a detailed analysis of the transient photovoltaic response in patterned Co/Si structures, including experimental observations and a modified drift-diffusion model incorporating local inductance.

Findings

Linear dependence of response on laser spot position

Sign change in response during laser-off stage

Microstructuring improves detector resolution

Abstract

The time dependent transient lateral photovoltaic effect has been studied with us time resolution and with chopping frequencies in the kHz range, in lithographically patterned 21 nm thick, 5, 10 and 20 um wide and 1500 um long Co lines grown over naturally passivated p-type Si (100). We have observed a nearly linear dependence of the transitorial response with the laser spot position. A transitorial response with a sign change in the laser-off stage has been corroborated by numerical simulations. A qualitative explanation suggests a modification of the drift-diffusion model by including the in uence of a local inductance. Our findings indicate that the microstructuring of position sensitive detectors could improve their space-time resolution.