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Kookheon Char "Semiconductor Nanocrystals for Optoelectronics..." Séminaire LSIMM

Semiconductor Nanocrystals for Optoelectronics : Shape Matters for the Photon-Electron Interconversions

Kookheon Char (The National Creative Research Initiative Center for Intelligent Hybrids The WCU Program of Chemical Convergence for Energy & Environment School of Chemical & Biological Engineering Seoul National University)

CHAIRE TOTAL ESPCI Mercredi 10 mai 2017 - 11h00 - Amphi Boreau

Ever since the synthetic methodology to prepare well-defined semiconductor nanocrystals (NCs) is well-established, multilateral efforts have recently emerged to utilize such NCs for optoelectronic devices. The unique optical and electronic properties of the semiconductor NCs serve a novel funtional toolbox which has never been found in conventional technologies and it would contribute to realize more efficient, high-performance, and economic nano- or opto-electronics. To take full advantage of such promising nanomaterials, understanding the fundamental properties of semiconductor NCs along with manipulating them through rational materials design is critically important.

From the viewpoint of materials science, the fundamental design principle of semiconductor NCs and their utilization to electron-photon interconversion devices will be addressed in this presentation. For the efficient electron-to-photon conversion devices, spherical core@shell quantum dots (QDs) have been designed and utilized as the active materials in light emitting diodes (QLEDs). On the basis of the energy-tuned inverted device structure, the core@shell QDs yield color-saturated electroluminescence spectra with high external quantum efficiency and extended device lifetime. For the conversion from photons to electrons, well-defined CdSe tetrapods have been prepared by the continuous precursor injection (CPI) approach. The bicontinuous heterojunction morphology consisting of CdSe tetrapods and conducting polymers produced high photocurrent and power conversion efficiency by the effective dissociation of excitons at the interfaces. The enhancement in the field-effect mobility of CdSe tetrapod networks also suggested that such branced nanocrystals could be one of promising building blocks in hybrid solar cells.


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