STRUCTURAL STUDIES ON SEMICONDUCTING HYDROGENATED AMORPHOUS SILICON OXIDE FILMS

Thermopower of nanocrystalline germanium/hydrogenated amorphous silicon composite thin films

Preliminary radiation tests of 32mm thick hydrogenated amorphous silicon films

Preliminary radiation tests of hydrogenated amorphous silicon n–i–p photodiodes deposited on a coated glass substrate are presented in this paper. These tests have been performed using a 24GeV proton beam. We report results on the fluence dependence of the diode dark current and of the signal induced by a proton spill.

Light-induced structural changes in hydrogenated amorphous silicon

A direct ab initio calculation of network dynamics and diffusion both for the ground state and light excited state for a-Si:H was performed. In the light excited state there was observed enhanced hydrogen diffused and formation of new silicon dihydride configurations: (H-Si Si-H)2(H-Si Si-H) and SiH2. For the first time, we show the detailed dynamic pathways that arise from light induced occupa...

Origins of structural hole traps in hydrogenated amorphous silicon.

The inherently disordered nature of hydrogenated amorphous silicon (a-Si:H) obscures the influence of atomic features on the trapping of holes. To address this, we have created a set of over two thousand ab initio structures of a-Si:H and explored the influence of geometric factors on the occurrence of deep hole traps using density-functional theory. Statistical analysis of the relative contrib...

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...