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SEPTEMBER 2019 I DESIGN007 MAGAZINE 35 everybody. I'm not a linguist. I have enough trouble with the English language! But IPC has to take care of all of the rules of the English language, and some of the phraseology that we use is odd. In some documents, there would be a dime next to an object, trying to show the size relationship between the two objects. Who knows what size a dime is except for the people in the United States? You can't use a dime for global documents; you have to use something else. Shaughnessy: Is this something that IPC Presi- dent John Mitchell is pushing to try to stream- line, or is it the chairpersons? Lambert: New people are coming in with differ- ent educations, so that's part of it. John Mitch- ell is an educator to start with, and IPC is look- ing to get more involved with the vocational schools, two-year colleges, four-year colleges with PCB design, etc. There's a lot of effort go- ing on in that direction. As the leader of the group, you can't get involved with the minuti- ae that we work with. John Mitchell is working those deals, and Collette Buscemi is focusing on education through the foundation. I want to try to work with her because I'm involved with UMass Lowell. IPC wants you to talk to students. They have pockets within the United States that they're working on, but in Massachusetts, they didn't have anyone. I said I would help. When I used to talk to young people, they'd have no idea about this industry. Now, they're building robots, and we've trained a couple of professors so they're familiar with 001 and can teach it, which helps. IPC is also offering scholarships and working in - ternships so that when students graduate, they'll have experience and can get hired. It's a generational thing, and it won't hap- pen overnight. I've been coming to IPC meet- ings for a long time, but you can't be involved in everything, so you have to pick and choose. Shaughnessy: It has been good talking to you, Leo. Thanks for the update. Lambert: My pleasure, Andy. DESIGN007 Control of Excitons in a 2D Semiconductor National University of Singapore (NUS) scientists have developed a method to control the binding ener- gies of excitons in a 2D semiconductor for advanced photonic and optoelectronic applications. A research team led by Professor Lu Jiong, depart- ment of chemistry, has developed a method to con- trol the excitons in a thin layer of rhenium diselenide (ReSe2) by adjusting the electron density in the un- derlying graphene film using the electrostatic gating effect, a method to modify the carrier concentration of atomically thin 2D materials by the application of an electric field. An increase (decrease) of electron carrier density in the graphene film will decrease (in- crease) the Coulomb interaction strength between the interacting excitons in the ReSe2 layer. By con- trolling the electron carrier concentration in the un- derlying graphene substrate, the researchers could control the electronic band gap and exciton binding energy of the monolayer ReSe2 by up to hundreds of milli-electronvolts (meV). In their experiments, the researchers demonstrat- ed that the exciton binding energy of the monolayer ReSe2 could be continuously tuned from 460 meV to 680 meV by electrostatic gating. "The ability to precisely tune the band gap and ex- citonic effects of 2D semiconductors on graphene de- vices could provide new insights into the band align- ment and exciton dissociation at the interface of 2D semiconductors and graphene. This could potentially reduce the interface contact resistance and improve the light-harvesting efficiency of such optoelectronic devices," said Professor Lu. (Source: NUS)

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