报告题目：Exploitation of Low-Dimensional Systems for Advanced Photovoltaics
主讲人: Prof. Gavin Conibeer, School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Australia
Truly large scale implementation of photovoltaics will require further significant reductions in cost. These will necessarily also involve significant increases in efficiency. The ability to do both of these in the same device can be realized through the use of multiple energy levels in nanostructures, whether coupled to existing cells in transitional technologies to boost efficiency, or in freshly engineered disruptive technologies on a longer timescale. The ability to tune the properties of materials using nanostructures gives much greater freedom in designing materials and structures for such high efficiency devices. Modification of energy bands in quantum well and quantum dot structures can be used to tune the band gap of materials for tandem solar cells. Quantum dot solar cells use this tuning of the band gap to engineer solution processable solar cell materials in materials such as lead sulphide/selenide, perovskites or silicon. Silicon quantum dots can also be used for passivation and as heterojunction contacts. Nanostructures can also confine vibrational modes. In nanowell and quantum dot superstructures this can lead to a modulation of phonon energies. This can be used in hot carrier cells to interrupt the loss of energy to phonons from a photogenerated hot carrier population to give higher photovoltaic voltages. Plasmonic modes excited in metal nanoparticles can be used to couple light more effectively into or out of nanostructure materials. In addition near field effects can be used to massively increase local fields to give concentrating effects. Light trapping also requires nanostructures to give effective non-coherent interference that can increase the optical thickness of materials dramatically. These nanostructure approaches to modifying electronic, optical or vibrational properties give a great deal more flexibility in materials design for solar cells. Other options for such exploitation, such as intermediate band solar cells and up or down conversion, will be briefly mentioned and the potential of several of these approaches to radically decrease costs per Watt discussed.
Professor Gavin Conibeer received his BSc degree from Queen Mary College, London University in Materials Science; MSc from the University of North London in Polymer Science; and PhD from Southampton University, UK, in III-V semiconductors. Conibeer has held research positions at Monash, Southampton, Cranfield and Oxford Universities and moved to the University of New South Wales, Sydney in 2002. He has published 2 books, 8 book chapters, 200 journal papers (including《Nature Communications》，《Advanced Materials》,《Advanced Energy Materials》,《Materials Today》etc.) and 50 refereed conference papers, with an H-index of 38 and 5000+ citations. He has been successful in securing more than A$12M of research funding. Conibeer is currently Professor and Executive Research Director of the Australian Research Council Photovoltaics Centre of Excellence at the University of New South Wales. Conibeer’s research group consists of 7 Ph.D. students, 2 postdoc fellows and 2 senior research fellows with interests in advanced concepts for photovoltaics, hot carrier solar cells, quantum dot solar cells, photovoltaic applications in space and photoelectrolysis and photocatalysis for solar fuels. Conibeer is also an editor-in-chief of《Solar Energy Materials and Solar Cells》with impact factor of 6.019(Q1 JCR).