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LEDs with different density of V-shaped pits are numerically investigated. To validate the used models and parameters, the experimentally external quantum efficiency (EQE) curve of blue InGaN/GaN multiple quantum well light-emitting diode (LED) is fitted with the calculated EQE curve. Simulation results show that the EQE is firstly enhanced and then reduced with an increase in the density of pits...
Recently, a tetragonal-like phase BiFeO3 (BFO) has been made by utilizing highly mismatched LaAlO3 (LAO)[1]. However, a significant contribution from the leakage current make great difficulty for a direct experimental observation of the ferroelectric hysteresis loop [1]. Here, ferroelectric BaTiO3 (BTO) was epitaxially grown on T-phase BFO/BTO (i.e., BFO film grown on a (001) oriented LAO substrate)...
Densely packed carbon nanotube (CNT) forest on silicon wafer has been fabricated by combining the process of mechanical press and liquid densification. Advantages from the densely packed CNT forest prototype devices include: (1) 16-fold volume reduction with the same amount of CNT forest as compared to the as-grown CNT forest; (2) preservations of aligned CNT organization and natural contacts to the...
A lithography-free microchannel fabrication process with controlled pattern is demonstrated via the combination of Near Field Electrospinning (NFES) and molding of polydimethysiloxane (PDMS). Electrospun polymer fibers (1–10µm in width, 0.5–4µm in height) were patterned onto a silicon substrate to serve as the template. Microfluidic devices with parallel and grid-pattern microchannels were created...
The electric-field control of magnetization has many potential applications in magnetic memory storage, sensors, and spintronics. A new multiferroic spin-valve (SV) heterostructure was grown by combining a multiferroic (BFO) and a spin valve on /Si substrate. Through the magnetoelectric...
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