In the Spanier Group we are working to advance photovoltaic science and technology via new polar oxide materials, including their preparation and growth, and laser spectroscopic and scanned proximal probe characterizations. We seek to address challenges relating to scaling and performance of transistors, and to develop devices with new functionalities. We investigate the electronic and functional properties of thin-film and nanoscale materials and devices, with an increased focus on the role of symmetry in designing new ecologically-friendly materials with new functionality or improved properties. Using both physical and chemical vapor growth (e.g. atomic layer deposition) we design, prepare, and characterize the structure and properties of new thin-film materials (particularly polar and non-polar complex oxides) and nanowires, and their interfaces. We use laser spectroscopic, electronic and optoelectronic transport, and dielectric and ferroelectric characterization methods. These investigations are aided by our studies of how functional and multi-functional properties can be tailored and improved in nanostructured materials. Among our current project activities are the following:
semiconducting ferroelectrics for robust and efficient oxide photovoltaics
new approaches for nanoscale transistor and memories
tunable hot electron transfer physics and devices
functional properties of ferroic and multi-ferroic nanostructures, e.g. for non-volatile memories and magnetic-field sensing
growth and properties of semiconductor and oxide nanowires
atomic layer deposition of oxide perovskite films and heterostructures
