講者：Prof. Jr-Hau He
演講題目：Photon managements by employing nanostructures for optoelectronic devices
演講時間：3/25(五) 下午3：30-5：00
演講地點：化工館工223會議室
主持人：廖英志教授
Bio
Dr. Jr-Hau He is an Associate Professor of Electrical Engineering at King Abdullah University of Science & Technology (KAUST). He was a Visiting Scholar at Georgia Tech (2005), a Postdoc Fellow at National Tsing Hua University (2006) and Georgia Tech (2007), a Visiting Professor at Georgia Tech (2008), UC Berkeley (2010 and 2014), and UC San Diego (2012-2013), and HKPolyU (Dec. of 2014), and a tenured Associate Professor at National Taiwan University (2007-2014).
His work encompasses a broad, multidisciplinary field, borrowing from electrical, physics, chemical and materials science and engineering to understand the effects of nanomaterials on the performance of advanced devices. He devotes his efforts in the development of transparent and flexible electronics using novel devices based on nanomaterials, including solar cells and photodetectors, LEDs, and memory devices. He is also interested in harsh electronics. His particular interest in solar energy include efforts to understand light scattering and trapping in nanostructured materials and designs for next-generation solar cells. He is also interested in transport of charge carriers across these solar cells as well as the improvement in light coupling with the combined effect to increase the efficiency of separating the photoinduced charges. Dr. He’s group is also currently involving in fundamental physical properties of nanomaterials, such as the transport and switching behavior of 2D nanomaterials. He emphasizes the transfer of the nanotechnology he developed to semiconductor and PV industry. Dr. He served as Accreditation Council of “Republic of China fine manufacturer association” to advise small and medium-sized enterprises to have innovation and product features in the marketplace.
He has garnered over 5878 citations for a body of work consisted of ~140 peer reviewed journal articles with 32 of H factor over his career and over 200 presentations in international conferences. His breakthrough researches have been highlighted over 50 times by various scientific magazines such as Nature, SPIE newsroom, IEEE SPECTRUM, EE Times, Semiconductor Today, Materials Today, Chemical & Engineering News, and Nano Today.
He participates actively in activities and services in scientific professional societies. Professor Jr-Hau He has been recognized internationally. He serves as a member of the editorial board for numerous prestigious journals, and as a chair, co-chair, and a member of technical and steering committees for national and international symposiums. He is a recipient of Ta-You Wu Memorial Award (2014), Outstanding Young Electrical Engineer Award by Chinese Institute of Electrical Engineering (2013), Outstanding Youth Award of Taiwan Association for Coating and Thin Film Technology (2012), Youth Optical Engineering Medal of Taiwan Photonics Society (2011), Distinguished Young Researcher Award of the Electronic Devices and Materials Association (2011), Prof. Jiang Novel Materials Youth Prize of International Union of Pure and Applied Chemistry (IUPAC) (2011), and the Exploration Research Award of Pan Wen Yuan Foundation (2008) and selected as a Member of the Global Young Academy (2011). He is a senior member of IEEE, OSA, and SPIE. The laboratory has graduated 7 PhD and 24 MS alumni to date. Visit his web for more information (nanoenergy.kaust.edu.sa).
Photon managements by employing nanostructures for optoelectronic devices
Jr-Hau He*
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division,
King Abdullah University of Science & Technology (KAUST)
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*jrhau.he@kaust.edu.sa
Abstract
It is of current interest to develop the photon management with nanostructures since the ability to suppress the reflection and light trapping over a broad range of wavelengths and incident angles plays an important role in the performance of optoelectronic devices, such as photodetectors, light-emitting diodes, optical components, or photovoltaic systems. Superior light-trapping characteristics of nanowires, including polarization-insensitivity, omnidirectionality, and broadband working ranges are demonstrated in this study. These advantages are mainly attributed to the subwavelength dimensions of the nanowires, which makes the nanostructures behave like an effective homogeneous medium with continuous gradient of refraction index, significantly reducing the reflection through destructive interferences. The relation between the geometrical configurations of nanostructures and the light-trapping characteristics is discussed. We also demonstrated their applications in solar cells and photodetectors. This research paves the way to optimize the nanostructured optoelectronic devices with efficient light management by controlling structure profile of nanostructures.
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