Photoinduced electrification of solids: II. Photovoltage transients

TL;DR

This paper derives and solves rate equations for photoelectrification mechanisms, comparing theoretical photovoltage transients with experimental data to understand the underlying processes in solids.

Contribution

It provides exact solutions for photoelectrification rate equations, enhancing understanding of photovoltage transients in solids, especially for negative-U sites.

Findings

Exact solutions match experimental transients

Clarifies role of slow electron-hole recombination

Differentiates negative-U and STE modes

Abstract

In relevance to the photoelectrification mechanisms proposed in Part I, we derive rate equations for the negative-u and STE photoelectrification modes and solve them under conditions close to experimental ones. Exact solutions are obtained for the case of a slow electron-hole recombination at negative-U sites. These solutions are compared with photovoltage versus time transients by "short circuit currents" in photocharging experiments.