Dissertation/Thesis Abstract

Nanophotonic Devices Based on Indium Phosphide Nanopillars Grown Directly on Silicon
by Bhattacharya, Indrasen, Ph.D., University of California, Berkeley, 2017, 194; 10685771
Abstract (Summary)

III-V optoelectronic device integration in a CMOS post-process compatible manner is important for the intimate integration of silicon-based electronic and photonic integrated circuits. The low temperature, self-catalyzed growth of high crystalline quality Wurtzite-phase InP nanopillars directly on silicon presents a viable approach to integrate high performance nano-optoelectronic devices.

For the optical transmitter side of the photonic link, InGaAs quantum wells have been grown in a core-shell manner within InP nanopillars. Position-controlled growth with varying pitch is used to systematically control emission wavelength across the same growth substrate. These nanopillars have been fabricated into electrically-injected quantum well in nanopillar LEDs operating within the silicon transparent 1400–1550 nm spectral window and efficiently emitting micro-watts of power. A high quality factor (Q ~ 1000) undercut cavity quantum well nanolaser is demonstrated, operating in the silicon-transparent wavelength range up to room temperature under optical excitation.

We also demonstrate an InP nanopillar phototransistor as a sensitive, low-capacitance photoreceiver for the energy-efficient operation of a complete optical link. Efficient absorption in a compact single nanopillar InP photo-BJT leads to a simultaneously high responsivity of 9.5 A/W and high 3dB-bandwidth of 7 GHz.

For photovoltaic energy harvesting, a sparsely packed InP nanopillar array can absorb ~90% of the incident light because of the large absorption cross section of these near-wavelength nanopillars. Experimental data based on wavelength and angle resolved integrating sphere measurements will be presented to discuss the nearly omnidirectional absorption properties of these nanopillar arrays.

Indexing (document details)
Advisor: Chang-Hasnain, Connie
Commitee: Chang-Hasnain, Connie, Lin, Liwei, Yablonovitch, Eli
School: University of California, Berkeley
Department: Applied Science & Technology
School Location: United States -- California
Source: DAI-B 79/08(E), Dissertation Abstracts International
Subjects: Nanoscience, Nanotechnology, Optics
Keywords: Nanolaser, Nanopillar, Nanowire, Optoelectronics, Photonics, Solar cell
Publication Number: 10685771
ISBN: 9780355831597
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