Characterization of Short-Wavelength-Selective a-Si:H MSM Photoconductors for Large-Area Digital-Imaging Applications
Photoconductor-type photodetectors are attractive as sensors due to their compatibility with thin-film-transistor (TFT) fabrication processes. Since they exhibit photogain, photoconductor detectors have better or comparable responsivity and quantum efficiency (QE) compared to p-i-n photodiodes. In this paper, the operation of metal-semiconductor-metal photoconductor-based photodetectors using aluminum electrodes and thin hydrogenated amorphous-silicon (a-Si) films is investigated. The experimental results of photocurrent measurements, as well as the responsivity and QE for different a-Si film thicknesses, bias voltages, and electrode gaps, are presented. Integration with TFT fabrication and its application in large-area digital imaging are discussed.
Two-dimensional amorphous-silicon photoconductor array for optical imaging.
A simple array of amorphous-silicon photoconductors is investigated for use as a two-dimensional imaging device. The characteristics of the lateral photoconductive sensors and the behavior of a 128 x 128 element array are described in detail. It is shown that a two-dimensional array of the photoconductive sensors is capable of high-quality optical imaging with reasonable imaging speed. The array is also capable of performing image processing in real time. Furthermore, the two-dimensional array is well suited for use in optical processing and neural-network architectures.
Comparative Policies of Legal Provisions for Plant Closure: Strike a Balance?
The article aims to explore the extent to which and how plant closure laws strike a balance between job security and managerial prerogative and assess the practical effects of legal provisions. To achieve this aim, the forms of underlying doctrines of legal provisions, and substantial and procedural requirements are deliberately examined by cross-national (i.e. UK, Germany, and Japan) comparisons. The findings reveal that the legal provisions of the selected nations do not seek to diminish management rights to close plants down. Instead, they attempt to impose more democratic control over the liberty and mobility of capital by negotiating with and compensating the affected workers.