Optically detected electron-nuclear double resonance in hydrogenated amorphous silicon

doi:10.1016/0378-4363(83)90695-2

Physica B+C

Volumes 117–118, Part 2, March 1983, Pages 923-925

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Abstract

Optically detected electron-nuclear double resonance (ODENDOR) measurements were carried out at 2 K and 9.6 GHz, monitoring total emitted light in hydrogenated amorphous silicon. ODENDOR signals were observed in the RF frequency range of 0.6 MHz – 15 MHz for the A centre (trapped hole centre) and dangling bond centre. The spatial distribution of weak hyperfine interaction with ²⁹Si nuclear spins may be responsible for broad ODENDOR lines.

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Cited by (5)

Optically detected electron nuclear double resonance in a-Si:H
1989, Journal of Non-Crystalline Solids
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 H¹ nuclei and the local ODENDOR signal associated with Si²⁹ nuclei have been observed for the first time. The average distance between the A-center and the H¹ 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 SiSi weak bond adjacent to a SiH bond.
Electron-nuclear double resonance of dangling-bond centres in a-Si:H
1987, Solid State Communications
We have observed the ENDOR spectra of dangling bonds in a-Si:H at 15K which are due to the hyperfine interaction with the ²⁹Si isotope at the dangling bond site and also due to that with the ²⁹Si isotope occupying one of its neighboring sites. The hyperfine splittings associated with the above interactions are 71 G and 26 G, respectively. The nature of the dangling-bond centre is discussed on the basis of these results.
Chapter 4 Optically Detected Magnetic Resonance
1984, Semiconductors and Semimetals
This chapter discusses the variation of electron spin resonance (ESR) that is optically detected magnetic resonance (ODMR). In ODMR the ESR is tuned to a known resonance, thus homogenizing the population of the split levels; then one compares the luminescence spectrum with and without the microwaves. Generally, if the luminescence signal increases in the presence of the microwaves, the resonance involves a radiative center. If the luminescence decreases, the center is a nonradiative recombination center. Since the various states (dangling bonds, donors, acceptors) have been identified, one can assess their role in the luminescence process. Thus, dangling bonds are nonradiative recombination centers. Their concentration increases when light-induced metastable states are formed. A center identified with trapped holes is radiative at −0.8 eV; it also can be a light-induced metastable state. A refinement of the ODMR technique consists in adding to the microwave a tunable rf pump that accesses the nuclear fine splitting. This technique is called electron nuclear double resonance.
Optically-detected endor of recombining shallow donors in znse and cds
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Optically detected electron-nuclear double resonance in hydrogenated amorphous silicon

Abstract

Solid State Commun.

Solar Cells

J. Phys. Soc. Japan