@inbook{4550a0dd56734b799be95dd1e8b9592c,
title = "An experimental evaluation of modulated photocurrent spectroscopy as a density of states probe",
abstract = "Modulated and Fourier-transformed transient photocurrent (MPC and TPC-FT) spectroscopies have been evaluated through a study of the density and capture properties of localised states in as-prepared and light-soaked PECVD a-Si:H samples over a range of temperatures and optical excitations. Both techniques return a conduction band tail state characteristic energy of approximately 22 meV. However, defect state spectra differ in detail and are strongly influenced by dc optical excitation. A feature correlating with the quasi-Fermi level position is observed, but the capture coefficient implied (of order 10-6 cm3 s-1) is some two orders greater than that calculated from thermal activation of emission frequencies. Such a value would suggest an implausibly low absolute density of defects. Possible explanations are briefly discussed and additional investigations proposed.",
author = "S Reynolds and C Main and D.P. Webb and Rose, {M. J.}",
year = "1999",
doi = "10.1557/PROC-557-427",
language = "English",
volume = "557",
series = "MRS Symposium Proceedings Series",
publisher = "Materials Research Society",
editor = "Branz, {H. M. } and R.W. Collins and S. Guha and H. Okamoto and R. Schropp",
booktitle = "Amorphous & Heterogeneous Silicon Thin Films - 1999",
}