有機光電子實驗室
The fundamental electronic structures of semiconducting and conducting polymers:
The understanding of fundamental electronic structures of 1D polymers is essential for their electronic applications such as photovoltaic, thermoelectric, light emission, and conduction. Researchers used to rely on theoretical calculation since the experimental means was prohibited by disordered molecular conformations. In order to measure the 1D electronic structures of polymers, we applied "directional self-assembly" and obtained highly ordered polymeric thin films. Hence, the unidirectional polymer chains allow researchers to experimentally access the long-range electronic structures of the 1D semiconductors.
The angle-resolved photoemission electron spectroscopy (ARPES) is supported by the National Synchrotron Radiation Research Center (NSRRC), Hsinchu, Taiwan.
Ref [1]. B.B.Y. Hsu, et al., Adv. Mater. 27, 7759-7765 (2015)
The 1D energy band
shown by angle-resolved photoemission spectra
Ordered molecular conformation shown by X-Ray scattering spectra
Ref [1]
Ordering organic semiconductors:
To order macromolecules holds the core of high-performance organic electronic devices; the higher order, the better performance. Introducing order in nano-scale relies on the elegant balance of the most complicated intermolecular forces among substrate surface, semiconductors, and solvents. We first fabricate nano-templates and anchor self-assembled molecules on the substrate to form directional self-assembled monolayers (d-SAMs). Then the d-SAMs will guide semiconducting molecules to form unidirectionally oriented thin films.
Ref [1]. Boulanger, et al., Phys. Chem. Chem. Phys. 19, 8496-8503 (2017)
Ref [2]. H.R. Tseng, et al., Nano Lett 12, 6353-6357 (2012)
The nano-templates that can provide anisotropic nucleation sites
The nano-fibers with and without the guidance of nano-templates 2 um x 2 um
Ref [2]
High-efficiency organic electronic devices:
Organic/Soft electronics is built by a special class of active electronic devices that accommodate electronic functionalities, mechanical flexibility, and scalability in a large area, which cannot be done by their inorganic counterparts. The unique flexibility and scalability allow not only dynamic operation but cheaply/massively-made organic solar cells, batteries, thermoelectric generators, photodetectors, LEDs, lasers, and transistors.
Our lab focuses on organic field-effect transistors (FETs), light emitting FETs (LEFETs), and lasers as the platforms for systematically evaluating the electronic/optoelectronic performance of fundamental electronic structures evolving with our controls over intermolecular forces and mophology.
The versatile applications of soft/organic electronics
Ben B.Y. Hsu doesn't own these pictures
Anisotropic spectroscopies:
Anisotropy is the most important order parameter corresponding to our directional coating techniques and device performance. We will use anisotropic UV-VIS absorption, fluorescence, and Raman spectroscopies as the guidance to control the parameters in the coating process, such as temperature, concentration, flow speed, etc. The qualitative spectroscopic anisotropy will be quantitatively connected to our experiments, giving more practical meaning.
Ref [1]. H.R. Tseng, et al., Nano Lett 12, 6353-6357 (2012)
Ref [2]. W.C. Tsoi, et al., JACS 133, 9834-9843 (2011)
The anisotropic absorption and Raman spectra
that show the electronic structures oriented with polymer chains
Ref [1]
