About Us
Our aim is to develop innovative photovoltaic technologies for high-efficiency compound semiconductor solar cells and materials. Our research includes material growth by molecular beam epitaxy (MBE), and structural, electrical, and optical evaluation of new photovoltaic materials and quantum nanostructures, as well as fabrication process and characterization of photovoltaic devices. We are also studying system performance and optimization of agriphotovoltaic (agriPV) technology.
Research
Primary targets are; (1) to develop high-quality 1eV-bandgap GaInNAs dilute nitride semiconductors for the next-generation multijunction solar cells, and (2) to demonstrate high-efficiency quantum dot intermediate band solar cell, which enables to use photons with energies lower than the band gap energy of the absorber by optical absorption via an intermediate band, resulting in enhancement of energy conversion efficiency.
Intermediate Band Solar Cell
3D quantum dots form an intermediate band within the bandgap, which can be used to increase the current via 2-step photoabsorption.
Multi-Junction Solar Cell
Solar cells with different bandgaps are monolithically connected via tunnel junctions or mechanically stacked to absorb a broad spectrum of solar energy.
Hot Carrier Solar Cell
Hot carriers generated in the absorber material are extracted through selective contacts resulting in a higher output voltage compared to the conventional cell.
Thin Film Solar Cell
High-efficiency thin-film solar cell is fabricated by epitaxial lift-off (ELO) technique. Substrates can be reused.
Device Simulation
Advanced device simulation is required to model and study quantum nanostructured solar cells.
Characterization
Characterization of multijunction solar cells requires a careful measurement and numerical analysis.
Agriphotovoltaic (agriPV)
A dual-axis sun-tracking agriPV system can simultaneously produce competitive solar power and maintain high-quality rice yield.
