Research
AI and MBE Automation
We demonstrated a closed-loop real-time-control of MBE growth using feed-back from an in-situ spectroscopic ellipsometer (SE) and a large material data base, which enabled precise control…
GaAs high efficiency ultrathin film solar cells
W. Yang, et al., J. Appl. Phys. 115, 203105 (2014).
This paper reports the proposal, design, and demonstration of ultra-thin GaAs single-junction solar cells integrated with a reflective back…
Theory
D. Ding, et al., J. Appl. Phys. 110, 123104 (2011).
A semi-analytical model is constructed for single- and multi-junction solar cells. Four typical planar structures with the combinations of a…
II-VI Semiconductor Solar Cells
J.-J. Li, L. et al., Applied Physics Letters 101, 061915-061915. (2012)
CdSe/CdTe type-II superlattices grown on GaSb substrates by molecular beam epitaxy are studied using time-resolved and…
Multijunction solar cell testing
S. H. Lim, et al., Progress in Photovoltaics: Research and Applications, (2011).
The effects of luminescence coupling on the external quantum efficiency (EQE) measurement of an InGaP/InGaAs/Ge…
Type-II Superlattice Semiconductors for Infrared Photodetectors
Type-II Superlattice Semiconductors for Infrared Photodetectors
E. H. Steenbergen, et al., Appl. Phys. Lett. 99, 251110 (2011).
Time-resolved photoluminescence…
Heterovalent Semiconductor Structure: MBE growth and characterization
MBE growth of various kinds of III-V and II-VI compound semiconductors.
A unique twin-chamber MBE system allows growth of any composition of III-V and II-VI alloys. Monolithic…
Two Color Detectors
E. H. Steenbergen, et al. Appl. Phys. Lett. 97 161111-161114 (2010).
A two-terminal multicolor photodetector that is most advantageous for greater than two bands is proposed. Individual color…
LEDs and Electroluminescence Refrigeration
Photon extraction factor vs spontaneous emission efficiency for the maximum photon recycling case in a and for the minimum photon recycling case in b. The cooling efficiency is positive in the…