Anisotropic magnetic centers and conduction electrons in hydrogenated microcrystalline silicon

Light-induced defect creation in hydrogenated polymorphous silicon

“…Si:H have a similar feature to those of a-Si:H rather than those of microcrystalline Si:H [2,11], light-induced defect creation in pm-Si:H may occur in a relaxed amorphous network. Accordingly, hydrogen content in this network affects the lightinduced defect creation.…”

Electron spin resonance studies of microcrystalline and amorphous silicon irradiated with high energy electrons

“…The density of these states is closely related to the electronic quality of the material [3]. A number of experimental results indicate the existence of two resonances in lc-Si:H at around g = 2.0043 and g = 2.0052 with a line width of about 4-8 G, which have been suggested to arise from different defects in different microscopic environments giving the observed asymmetric ESR signal of lc-Si:H. Alternatively it has been proposed that the signal is due to a P b -like defect with a pronounced axial symmetric g-tensor [11][12][13]. So far no conclusive interpretation exists.…”

“…In a-Si:H an ESR line is observed with a g-value of 2.0055 and a line width of DH pp = 7 G. Identification of this resonance with Si dangling bonds (db) is widely accepted. ESR studies on lc-Si:H do show signals at g = 2.0040 À 2.0053, significantly shifted from the db g-value in a-Si:H and which are considerably affected by preparation conditions, structure composition and post-preparation treatment [1][2][3][4][5][6][7][8][9][10][11][12][13]. The density of these states is closely related to the electronic quality of the material [3].…”

Structure of the ESR spectra of thin film silicon after electron bombardment

“…The resonance in lc-Si:H is observed at g = 2.0043-2.0052 with a line width of 6-8 G. The parameters of the line depend on the deposition conditions, material structure and sample history [4,5]. Two interpretations for the ESR signal in lcSi:H are mostly discussed: a superposition of dangling bonds in different environment (db1 and db2) [6,7] or a powder spectrum of anisotropic defects [8][9][10].…”