X-ray absorption analysis of structural disorder in amorphous silicon

X-ray absorption spectroscopy elucidates the impact of structural disorder on electron mobility in amorphous zinc-tin-oxide thin films

on electron mobility in amorphous zinc-tin-oxide thin films Sin Cheng Siah, Sang Woon Lee, Yun Seog Lee, Jaeyeong Heo, Tomohiro Shibata, Carlo U. Segre, Roy G. Gordon, and Tonio Buonassisi Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA Department of Materials Science...

Metal induced crystallization of amorphous silicon thin films studied by x-ray absorption fine structure spectroscopy

The role of thin metallic layer (Chromium or Nickel) in the crystallization of a-Si film has been studied using X-ray absorption fine structure spectroscopy (XAFS). The films were grown at different substrate temperatures in two different geometrical structures : (a) a 200 nm metal layer (Cr or Ni) was deposited on fused silica (FS) followed by 400 nm of a-Si and (b) the 400 nm a-Si layer was d...

Structural disorder induced in hydrogenated amorphous silicon by light soaking

We show, using variable coherence transmission electron microscopy, that light soaking of amorphous hydrogenated silicon thin films leads to structural changes. We speculate that the structural changes are associated with instability in the as-deposited material. We suggest that improved immunity to Staebler–Wronski degradation could be achieved by a less-ordered material which is closer to the...

Structural anisotropy in amorphous SnO2 film probed by X-ray absorption spectroscopy

Polarization-dependent X-ray absorption measurements reveal the existence of structural anisotropy in amorphous (a-) SnO2 film. The anisotropy is readily seen for the second neighbor interaction whose magnitude differs along three measured directions. The differences can be well accounted for by 10%–20% variation in the Debye-Waller factor. Instead of a single Gaussian distribution found in cry...

Crystallization of Amorphous Germanium Investigated by X-ray Absorption Spectroscopy