Record Details

Studies on Amorphous Silicon Thin Films Doped with Aluminium

Electronic Theses of Indian Institute of Science

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Field Value
 
Title Studies on Amorphous Silicon Thin Films Doped with Aluminium
 
Creator Ho, Kang Jin
 
Subject Electronics Engineering
Silicon Thin Films
Amorphous Semiconductors - Doping
A1 doped Sputtered Silicon films
Solids - Electrical Conduction
Thermionic Emission
Diffusion Process
Schottky Barrier Diodes
Polycrystalline Semiconductors - Conductivity
Amorphous Semiconductors - Electrical Conduction
 
Description Amorphous Silicon(a-Si) films have attracted the attention of several investigators as it is an economical material for devices. One of the problems that is addressed is the doping of these films after they are prepared.
In this thesis, we investigated the effects of doping amorphous Sil­icon films(prepared by r.f. sputtering) with Aluminium(Al) by ther­mal diffusion. Amorphous Silicon films have been prepared on glass substrates at optimal process parameters. Then, the a-Si films are coated with Al by vacuum evaporation and subjected to heating in N2 atmosphere in the temperature range 300°C to 600°C for different durations.
After etching Al layer, it has been found that some of the films which are heated around 550°C contain filament like polycrystalline regions surrounding islands of a-Si.
This structure has been confirmed through Scanning Electron Mi-croscope(SEM) photographs and electrical conductivity measurements. SEM photographs indicate that, bright regions of amorphous mate­rial are surrounded by dark regions of relatively higher conducting
boundaries.
The electrical conductivity study shows that there is sharp increase in conductivity of Al doped films, which is attributed to the conduct­ing polycrystalUne filament.
A simple model has been proposed to explain the variation of con­ductivity of these transformed films, with process parameters and with temperature.
Schottky barrier diodes have been fabricated using these trans­formed materials and their characteristics explained.
 
Publisher Indian Institute of Science
 
Contributor Satyam, M
 
Date 2005-10-25T05:23:31Z
2005-10-25T05:23:31Z
2005-10-25T05:23:31Z
1995-01
 
Type Electronic Thesis and Dissertation
 
Format 1791859 bytes
application/pdf
 
Identifier http://etd.iisc.ernet.in/handle/2005/157
null
 
Language en
 
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