Urbach tail studies by luminescence filtering in moderately doped bulk InP

TL;DR

This study uses luminescence filtering to accurately measure Urbach tails in moderately doped InP, revealing how the photoluminescence spectrum shifts with distance from excitation, consistent with absorption spectra.

Contribution

It introduces a novel method for independently and precisely determining Urbach tails in semiconductors using luminescence filtering.

Findings

Red shift in luminescence maximum observed with distance from excitation

Luminescence filtering method aligns with absorption spectra

Provides accurate measurement of Urbach tails in doped semiconductors

Abstract

The shape of the photoluminescence line registered from a side edge of InP wafer is studied as function of the distance from the excitation spot. The observed red shift in the luminescence maximum is well described by radiation filtering and is consistent with the absorption spectra. Our method provides an independent and accurate determination of the Urbach tails in moderately doped semiconductors.