Laplace-transform transient photocurrent spectroscopy as a probe of metastable defect distributions in hydrogenated amorphous silicon

Mariana J. Gueorguieva, Charlie Main, Steve Reynolds

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)

Abstract

Three Laplace transform methods for recovering the density of electronic states from transient photocurrent data are evaluated through a study of light-induced defect creation in PECVD a-Si:H films. A mathematically approximate method is shown to be sufficient to resolve the deep defects, whose density is estimated to increase by a factor of five from the annealed state after 3 hours' exposure to simulated AM1 illumination. An exact method, and a method employing Tikhonov regularisation, are found to give very similar results, provided the current-time data are smoothed beforehand in the former case. The increased resolution available is, however, unnecessary here, and these methods are shown to be more suited to the study of discrete levels or narrow distributions.

Original languageEnglish
Article numberA19.3
JournalMaterials Research Society Symposium - Proceedings
Volume664
DOIs
Publication statusPublished - 2001
EventAmorphous and Heterogeneous Silicon Based Films 2001 - San Francisco, CA, United States
Duration: 16 Apr 200120 Apr 2001

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