Seminars

Photo-induced Carrier Dynamics of Heterostructured Semiconductor Nanocrystals

November 14, 2018
Authors: Masanori Sakamoto (Institute for Chemical Research, Kyoto University)

Aula Polvani, Dipartimento di Fisica (via Celoria 16, Milano).
11.00 a.m.

Nano-sized semiconductors exhibit unique properties which are different from those bulk. Furthermore, the versatile tunability of the physical properties and geometrical structures of nanocrystals (NCs) provides a route for exploring the favorability of different nanostructures for various applications. Synthesizing NCs composed of two or more chemical species significantly expands available NC geometric structures and functionality. Heterostructured NCs (HNCs), which combines the distinguished phase of semiconductors in a NC, are promising materials in energy conversion, sensors, and catalysts. The unique properties and good performance of heterstructured NCs drived from the combined effect of independent functional units, and/or precious controlling of carrier transfer between distingushed phases. Understanding the relationship between geometry (shape, volume, and heterointerface area) and carrier dynamics in HNCs is an important subject for controlling photo-generated carriers in HNCs. Although a variety of nanostructures, including heterodimers, dumbbells, dots-in-rods, and multiple satellites on the spheres, have been developed, the investigation on the relation of geometrical structure and photo-induced carrier dynamics is still an important subject. We synthesized a series of HNCs (heterotetrapod composed by the chalcopyrite CuInS2 (ch-CuInS2) core and CdS arms, phase-segregated CdS/CdTe heterostructured nanopencils, with controlled anisotropic structure and CdS/CdTe volume, etc.) using the wet chemical synthesis method and investigated how geometry influences photo-induced charge separation in HNCs using various spectroscopic techniques.

Referent: Marcel Di Vece

Poster: locandina_6312