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Integration And Mass Transfer Of Microleds

Brief description not available

Homogeneous Freestanding Luminescent Perovskite Organogel with Superior Water Stability

UCLA researchers in the Department of Materials Science and Engineering have developed a perovskite-embedded organogel with superior water stability and versatile design and mechanical properties.

Rheological Tuning of the Crystal Growth

Solutions of shear-thinning polymers are known to decrease in viscosity as a shear force is applied to the solution. In this work, the inventors show that by pre-shearing a shear-thinning polymer solution mixed with a precursor solution of a semiconducting crystal we can tune the size and morphology of the growing crystals, which governs the optoelectronic properties of the formed crystals. By pre-shearing the solution we are able to lower the viscosity of the solution, which plays a key role in the liquid phase processing (eg., coating processes). By forming a thinner, low-viscosity coating, we are able to tune the nucleation and growth rate of the crystals to form crystals that are smaller and more uniformly distributed in size, leading to a uniform and conformal coating. This approach allows us to coat a uniform layer of semiconducting crystals, which is necessary for developing functional optoelectronic devices.

Iii-N Transistor With Stepped Cap Layers

A new structure for III-N transistors that is able to maintain a high breakdown and operating voltage while improving the gain of the device.

Fabrication of Relaxed Semiconductor Films without Crystal Defects

A technique for making relaxed InGaN layers without crystal defects.

Heterogeneously Integrated GaN on Si Photonic Integrated Circuits

A process that results in new capabilities of GaN lasers. Functionalities include surface emission, beam steering, enhanced performance, low waveguide loss, and superior reliability.

Wafer Bonding for Embedding Active Regions with Relaxed Nanofeatures

An alternative method, using wafer bonding, to connect relaxed nanostructures in the active region with separately grown material.

Methods for Locally Changing the Electric Field Distribution in Electron Devices

A surface treatment that can shape the electric field profile in electronic devices in 1, 2, or 3 dimensions.

Vertical Cavity Surface-Emitting Lasers with Continuous Wave Operation

An m-plane VCSEL with an active region that has thick quantum wells and operation in continuous wave.

Reduction in Leakage Current and Increase in Efficiency of III-Nitride MicroLEDS

A way to reduce leakage current and increase the efficiency of III-Nitride microLEDs via ALD sidewall passivation. 

Multifaceted III-Nitride Surface-Emitting Laser

Improved laser capability using III-Nitride VCSELs as the illumination source for sensing applications of a fluorescent sample.

High Mobility Organic Semiconductors

Brief description not available

Achieving “Active P-Type Layer/Layers” In III-Nitride Epitaxial Or Device Structures Having Buried P-Type Layers

Researchers at the University of California, Santa Barbara have created both surface and buried p-type regions without the need for doping the materials with an acceptor.

Methods for Fabricating III-Nitride Tunnel Junction Devices

Methods of physical vapor deposition for III-nitride tunnel junction devices.

Internal Heating for Ammonothermal Growth of Group-III Nitride Crystals

A new process for heating vessels used in the ammonothermal growth of group-III nitrides.

Unipolar Light Emitting Devices On Silicon Based Substrates

A process that provides a less expensive alternative for growing light emitting material compared to growing on lattice matched native III-V substrates.

Stand-Alone Ceramic Phosphor Composites for Laser-Excited Solid-State White Lighting

A method for generating a stand-alone ceramic phosphor composite for use in solid state white light generating devices that successfully reduces the operating temperature of the phosphor material by 50%, increases lumen output, reduces cost of materials, and decreases preparation time.

Increased Light Extraction with Multistep Deposition of ZnO on GaN

A method of depositing ZnO on III-nitride materials using a multistep approach involving the deposition of a thin seed layer followed by the deposition of a thicker bulk layer.

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