Light-Soaking Effects on Photoconductivity in a-Si:H Thin Films

Autor:	E. Morgado, M. Rebelo da Silva, R. T. Henriques
Rok vydání:	1997
Předmět:	Materials science Silicon business.industry Photoconductivity chemistry.chemical_element Illuminance Crystallographic defect Molecular physics law.invention chemistry law Metastability Optoelectronics Thin film Electron paramagnetic resonance Spectroscopy business
Zdroj:	MRS Proceedings. 467
ISSN:	1946-4274 0272-9172
DOI:	10.1557/proc-467-109
Popis:	Metastable defects have been created by light exposure in thin films of a-Si:H. The samples have been characterized by Photothermal Deflection Spectroscopy, Electron Spin Resonance, dark- and photo-conductivity. The experimental results are consistent with numerical calculations with a recombination model involving band tails and one class of correlated dangling-bond states. The effects of light-soaking on the ligh intensity and defect density dependences of photoconductivity are reproduced by the calculations. The model allows to explain the experimental trends by changes in the electronic occupation of the gap states produced by light-induced defects.
Databáze:	OpenAIRE
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