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Jr-Hau (J.H.) He

Prof. Jr-Hau  He

Professor
King Abdullah University of Science & Technology (KAUST)

Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Room 3217, Building 3
Thuwal
Jeddah  23955-6900
Saudi Arabia

tel: 8084377
E-mail: jrhau.he@kaust.edu.sa
Web: http://nanoenergy.kaust.edu.sa

Area of Expertise

Design, performance and reliability of electronic and optoelectronic devices (such as photovoltaics, LEDs, memory, thin-film transistors and sensors) with applications in harsh environments, transparent electronics, and flexible electronics.

Biography

Dr. Jr-Hau He is an Associate Professor at Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science & Technology (KAUST). 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.

Lecture Title(s)

Photon managements by employing nanostructures for optoelectronic devices


It is of current interest to develop 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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