Amorphous silicon continues to make great strides in its commercialization, particularly its use in thin-film transistors (TFTs) for active matrix liquid crystal displays (AMLCDs). This book reports on devices incorporating amorphous silicon (a-Si), as well as on the continuing efforts to understand the structure and properties of the broad range of a-Si-based materials. Device reports range from new concepts, such as photovoltaic/electrochromic window coatings, to current products, such as active matrix liquid crystal displays. In the middle ground are amorphous silicon sensors. Sensor arrays based on a-Si pin diodes are in an advanced state of development, and will be used both for monochromatic applications such as x-ray imaging, as well as for color scanning. Topics include: deposition studies, plasma and films; fundamental studies and defects; hydrogen's role and metastability; optoelectronic properties and transport studies; modified band-gap materials and doping studies; solar cells; thin-film transistors; image sensors and novel devices; flat panel displays.