Abstract
Optically detected electron nuclear double resonance (ODENDOR) experiments have been carried out to elucidate the microscopic structure of trapped hole centers ( A-centers) in a-Si:H. The matrix ODENDOR signal associated with the H 1 nuclei and the local ODENDOR signal associated with Si 29 nuclei have been observed for the first time. The average distance between the A-center and the H 1 nucleus is estimated at 5 ∼ 6 Å from the width of the former signal, while the extent of the wave function of the A-center is estimated at 5 ∼ 7 Å from the latter signal. Based on these results, it is suggested that the A-center is a self-trapped hole at a SiSi weak bond adjacent to a SiH bond.
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