amorphoussemiconductors congresses defects designandconstruction electricproperties germanium germaniumalloys heterostructures integratedcircuits materials opticalproperties opticalwaveguides optoelectronicdevices organosiliconcompounds photonics physiologicaleffect polymers quantumelectronics semiconductordoping semiconductors silica siliconalloys siliconinthebody surfacechemistry surfaces testing thinfilmdevices