Exotic silicon-based materials from high-pressure synthesis: hexagonal Si-4H for photovoltaic applications

Friday, November 15, 2019 - 11:00am to 12:00pm

Speaker:  Silvia Pandolfi, Sorbonne Université (IMPMC)

Program Description:

Synthesis of exotic forms of silicon (Si) with enhanced optoelectronic properties is one of the main challenges for current technology. Careful design of high-pressure (HP) pathways can lead to the stabilization of new materials with novel properties. In this work, we use in-situ x-ray diffraction to investigate Si transition mechanisms at high-pressure and, with these new insights, we synthesize and characterize new Si-based materials. We provided the first synthesis of pure hexagonal Si, a promising candidate for photovoltaic applications. Our structural characterization reveals a hierarchical nanostructure that is expected to increase its potentiality for solar energy conversion, and that could enable design and engineering of nano-patterned devices.

Exotic silicon-based materials from high-pressure synthesis: hexagonal Si-4H for photovoltaic applications
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