Flat Panel and LCD Screens, Part 2

By | 2017-11-07T14:38:27+00:00 June 24th, 2016|Materials Science, Semiconductor|

Figure 1: Unpowered Sony Ericsson S500i LCD screen at 200x magnification In our last blog post, I wrote about some of the physics and materials science principles that go into the design and manufacture of liquid-crystal display (LCD) screens.  The eponymous liquid crystals (LCs) in such a display have to be quite small in order to create a seamless image; as I mentioned in the last entry, the subpixels (the red, green and blue elements comprising a pixel, visible in Figure 1) can be smaller than a red blood cell.  Each of these subpixels needs its own [...]

Layered Composite Heaters for Semiconductor Processing

By | 2017-11-07T14:56:05+00:00 April 15th, 2016|Materials Science, Semiconductor, Thermal Management|

Figure 1: Composite layered heater from patent  US 9,224,626 B2 Alexander Glew, Ph.D., P.E. recently contributed to a new patent on an advanced thin-film electric heaters, layered composite heaters, for CVD semiconductor processing and related technologies titled “Composite substrate for layered heaters”.  Watlow Electric, based in St. Louis, hired Glew Engineering and Dr. Glew to help develop this heater technology due to his experience in the Silicon Valley’s semiconductor industry.  As a semiconductor equipment expert and materials engineering consultant, Dr. Glew’s familiarity with semiconductor manufacturing meant he understood both the limitations of common semiconductor chuck heating methods and the techniques that [...]

Semiconductor Safety: Pyrophoric Gases

By | 2017-11-08T16:11:01+00:00 February 19th, 2016|Mechanical Engineering, Safety, Semiconductor|

We have written about pyrophoric materials in a number of Glew Engineering’s previous blogs on safety in semiconductor fabrication, but have yet to cover how to define it or its danger.  At its simplest, a pyrophoric substance is any substance that spontaneously ignites in room temperature air.  As one might imagine, spontaneous combustion on contact with the regular atmosphere we live in can be quite dangerous. Last year, Glew Engineering assisted a research lab in designing a safe gas distribution system for their plasma-enhanced chemical vapor deposition chamber.  During the initial work, the building administrators and safety managers were concerned about the lab’s proposed [...]

High-purity Gas Panels Part 11: Mass Flow Controllers

By | 2017-05-04T14:14:07+00:00 October 9th, 2015|Mechanical Engineering, Semiconductor|

Thermal Mass Flow Controllers A mass flow controller (MFC) for each gas line in a semiconductor tool’s gas panel measures and regulates the mass flow of the gas in order to set the gas entering the process chamber to the values in the process recipe.  While pressure regulation and temperature control are needed for sensitive chemical vapor deposition (CVD), plasma etching, or thin film processes, gas flow control can be just as important. Semiconductor process recipes involve precise ratios of gas phase chemical to assure the correct stoichiomtery and reaction rates.   Due to the accuracy and precision required [...]

High-Purity Gas Panels Part 10: Pressure Transducers in Semiconductor Equipment

By | 2017-05-31T11:56:37+00:00 October 1st, 2015|Electrical Engineering, Engineering Consulting, Mechanical Engineering, Safety, Semiconductor|

An article on pressure transducers used in semiconductor fabs and semiconductor equipment.

High-purity Gas Panels Part 3: To Abatement and Exhaust

By | 2017-05-05T10:55:03+00:00 July 27th, 2015|Engineering Consulting, Mechanical Engineering, Safety, Semiconductor|

Mechanical engineering design for high-purity processes in semiconductor fabs: process pumps, abatement and exhaust lines.

New Class of Electronic Devices Could Come From 2-D Transistors

By | 2017-05-08T11:24:49+00:00 July 9th, 2014|Materials Science, Mechanical Engineering, Semiconductor|

Thin-film transistors and field emission transistors made from 2-D materials could lead to a new class of electronic devices.