The Microelectronics and Photonics group develops new materials, fabrication, and device technologies at the micro/nanoscale for use in next-generation electronic circuits, solar cells, visual displays, sensors, and optical communications.
Current Research Areas
- Thin-film transistors
- Microelectromechanical Systems (MEMS)
- Sensors, actuators, and micromachines
- Photonic crystals
- Negative-index materials
- Organic light-emitting devices (OLEDs
- Organic solar cells
- Plasma materials processing
- Plasmonic devices
- III-V semiconductor materials and devices
- Nanomaterials and nanofabrications
- Additive manufacturing
Faculty in This Group
Research Centers and Laboratories
- Ames National Laboratory
- Bioengineering Research Laboratory
- Integrated Micro-Nanosystem Lab
- Laboratory for MEMS and Biochips (MEMS)
- Laboratory for Integrated Optical Sensors (LIOS)
- Microelectronics Research Center (MRC)
- Plasmonics & Microphotonics Laboratory
- Semiconductor Materials and Devices
Light-matter interactions in nanostructures; nano-plasmonic structures for enhancing solar cells; organic light-emitting diodes (OLEDS); opto-electronic devices; surface tribocharge in novel nanostructures.
Photovoltaic energy conversion materials and devices. Our research is focused on developing stable perovskite materials and devices. We have achieved all-inorganic perovskite materials and solar cells which are thermally stable up to 300 C temperature and are also are resistant to high moisture environments. Such solar cells can be used as the top cell in a tandem cell arrangement with Si solar cells acting as the bottom cell, leading to high solar to electric conversion efficiencies.
Innovating tools and methods to advance digital agriculture, plant and animal sciences, sustainable ecosystems, and biomedicine. Exploring MEMS sensors, biosensors, electrochemical sensors, micro-optical devices, and microfluidic biochips to measure non-traditional phenotypes. Developing nanomaterials and nanomanufacturing methods towards upscaling and industrialization. Field validation of the developed materials, devices, and systems to solve real-life problems.
Wide bandgap semiconductor (i.e., GaN and nitride alloys, Ga2O3 and oxide alloys, and AlN) materials, devices and systems for applications in electronics (e.g., power electronics and ICs, RF, sensors) and photonics (e.g., optoelectronics, quantum photonics).
Nanoscale fabrication and electrical phenomenon for practical applications in optics and bioengineering.
Utilizing and synthesizing micro and nanoscale materials, developing novel micro and nanodevices, and micro and nanosystems for biomedical applications.
Research projects focus on organic and perovskite-based optoelectronic materials and devices. They include:
(1) Combined optoelectronic and magnetic resonance studies, mostly electron paramagnetic resonance (EPR) and optically- and electrically-detected magnetic resonance (ODMR and EDMR, respectively). These provide striking insight into the science underlying
(i) electron, hole, and excitons dynamics, and
(ii) photodegradation and other stability issues.
(2) Light extraction from flexible corrugated and planarized OLEDs on patterned substrates.
(3) Thin-film all-organic/hybrid optical biochemical sensors, typically excited by OLED pixels integrated with sensing elements and thin-film photodetectors, and spectrometer-on-a-chip.
[Spectrometer-on-a-chip: multi-color microcavity OLED pixels/organic photodetector (OPD) arrays. (a)1 and (a)2: electroluminescence (EL) spectra of combinatorial arrays of microcavity OLEDs; (b) and (d): absorption spectra of P3HT and Alexa Fluor 405 films, respectively, measured by OLED/OPDs and by a reference spectrophotometer.]
Basic and applied studies of organic and hybrid (perovskite-based) electronics: light extraction from OLEDs and microcavity OLED arrays, organic and hybrid solar cells and photodetectors (including photo-degradation), all-organic/hybrid (bio)chemical optical sensors, and sensors- and spectrometer-on-a-chip.
Antenna analysis and design, Fast and efficient algorithms in computational electromagnetics, Metamaterials, Electromagnetic wave propagation and scattering, Modeling of VLSI interconnects on silicon and signal integrity, Inverse scattering and nondestructive evaluation, Eddy current NDE, and Ultrasonic NDE.