NanoTechnology: Materials, Processes & Devices

Research that includes:

  • Development of nanostructure fabrication technology
  • Nanomagnetics, Microphotonics
  • CMOS Integrated Nanowires/Nanotubes (CMOS-Inn)

Kadircan Godeneli

Graduate Student Researcher
Electrical Engineering and Computer Sciences
Professor Alp Sipahigil (Advisor)
Ph.D. 2026 (Anticipated)
Kadircan received his B.S. degrees in Electrical Engineering and Physics from Bogazici University, Istanbul, Turkey in 2021. He is currently pursuing a Ph.D. in the Quantum Devices Group at UC Berkeley under the supervision of Prof. Alp Sipahigil.

Lukasz Komza

Graduate Student Researcher
Physics
Professor Alp Sipahigil (Advisor)
Ph.D. 2026 (Anticipated)

Lukasz Komza is a Physics PhD student at the University of California, Berkeley. He started working with Alp Sipahigil in the Quantum Devices Group in 2021 on the characterization and integration of silicon qubits in photonics. Prior to starting his PhD, Lukasz interned at Bell Labs in Murray Hill, NJ, working with Michael Eggleston on optical coherence tomography. He studied quantum light sources in 2D materials with Stefan Strauf during his undergraduate education, where he received the Alfred M. Mayer prize.

BPN967: Characterization of Quantum Emitters in Silicon Photonics

Lukasz Komza
Polnop Samutpraphoot
Mutasem Odeh
Milena Mathew
2022

Telecom-band single-photon emission has recently been reported from a broad diversity of color centers in silicon. These quantum emitters in silicon combine several key properties for scalable quantum communication and photonic quantum computing applications. Their long spin coherence times are suitable for storing quantum states. The use of silicon as a host crystal could enable the adoption of semiconductor manufacturing methods for scalability. Finally, their telecom-band emission is compatible with low-loss quantum communication in fiber networks. These applications require an...

BPN968: Metal-Organic Framework Based Triboelectric Nanogenerator for Self-Powered Gas Sensing

Jihoon Chung
Adrian K. Davey
Isaac Zakaria
2022

With the rise of interest in the Internet of Things (IoT), the need for low-power sensors for monitoring the working environment has been in spotlight. Considering the number of sensors required to provide real time monitoring, creating sustainable and self-powered sensors is essential. Triboelectric nanogenerator (TENG), which converts mechanical motion to electrical energy, is one of the most promising candidates for realizing self-powered sensors due to its sensitivity to surface material properties and ability to generate consistent signals depending on mechanical input. Here, we...

BPN931: Multiplexed Electroluminescent Device for Emission from Infrared to Ultraviolet Wavelength

Vivian Wang
Junho Park
2022

Using electroluminescence as a metrology method could have many advantages for on-chip characterization of chemical composition, where the need for an on-chip light source can be eliminated and materials with different excitation energies can be characterized by the same device. However, the range of materials that can be used in electroluminescent devices is typically limited due to challenges related to material processing and band alignment. In this project, we aim to develop a multiplexed electroluminescent device that can produce electroluminescence from infrared to ultraviolet...

BPN971: Bright Mid-Wave Infrared Light-Emitting Diodes Based on Black Phosphorus

Niharika Gupta
2022

The mid-wave infrared (MWIR) wavelength range plays a central role in a variety of applications, including optical gas sensing, industrial process control, spectroscopy, and infrared (IR) countermeasures. Among the MWIR light sources, light-emitting diodes (LEDs) have the advantages of simple design, room-temperature operation, and low cost. Owing to the low Auger recombination at high carrier densities and direct bandgap of black phosphorus (bP), it can serve as a high quantum efficiency emitting layer in LEDs. In this work, we demonstrate bP-LEDs exhibiting high external quantum...

Synthesis and Gas Sensing Properties of NiO/ZnO Heterostructured Nanowires

Sikai Zhao
Yanbai Shen
Yong Xia
Aifei Pan
Zhou Li
Carlo Carraro
Roya Maboudian
2021

In this study, we report on the synthesis of the NiO/ZnO heterostructured nanowires by a facile two-step liquid phase route and their gas sensing characteristics employing Au interdigitated electrodes integrated on a miniature ceramic heater. Microstructural characterizations indicate that flocculent NiO particles are uniformly assembled on the outer surfaces of the single-crystalline ZnO nanowires, with diameters around 50 nm and lengths ranging from 500 nm to several μm. The gas sensing investigation indicates that the sensors based on NiO/ZnO heterostructured nanowires exhibit high...

In-Situ Synthesized N-Doped ZnO for Enhanced CO2 Sensing: Experiments and DFT Calculations

Yong Xia
Aifei Pan
Ya-Qiong Su
Sikai Zhao
Zhou Li
Adrian K. Davey
Libo Zhao
Carlo Carraro
Roya Maboudian
2022

Chemiresistive CO2 sensing is attractive due to low cost and ease of chip-level integration. Our previous studies (Yong Xia, 2021) showed the well-developed ZnO material fabricated by in-situ annealing exhibited good CO2 sensing performance. Here, we have expanded on those studies, including CO2 cyclic tests under both dry air and N2 background whereby a much higher response to CO2 in N2 background was observed. Detailed density functional theory calculations were conducted to understand the behavior. The results indicated nitrogen doping is mainly responsible for the observed response. In...

A New Chemresistive NO2 Sensing Material: Hafnium Diboride

Sikai Zhao
Yong Xia
Steven DelaCruz
Aifei Pan
Zhou Li
Yanbai Shen
Marcus A. Worsley
Carlo Carraro
Roya Maboudian
2022

While metal oxides and metal sulfides have been extensively studied for gas sensing applications, there are no extensive reports on gas sensing properties of metal diborides. Here, for the first time, we have investigated the conductometric gas sensing behavior of HfB2 nanoparticles. The HfB2 nanoparticles is synthesized via a sol-gel method and characterized using X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The gas sensor is fabricated by drop casting the HfB2 nanoparticles on interdigitated Ag/Pd...

BPN975: Suppressing Surface Piezoelectricity in Superconducting Circuits (New Project)

Eric Li
Kadircan Godeneli
2022

Superconducting quantum circuits are one of the leading technologies for building quantum computers. These circuits are made of superconducting resonators with quality factors on the order of $10^5-10^6$. Because of the high device Q-factor when operating in the superconducting regime, loss mechanisms that would otherwise be insignificant to the overall resonator Q-factor start to become important. One such mechanism we explore in this project is the impact of surface piezoelectricity on qubit and resonator quality factors. Surface piezoelectricity arises due to atomic dipoles...