Thursday - April 2, 2009
SLAC Today is
available online at:
http://today.slac.stanford.edu
In this issue:
Molecular Alignment Gives Monolayers the Edge in Bendable Semiconductor
Required Computer Security Training Now Online
Transition to Office 2007: Classes Offered
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Thursday - April 2, 2009 |
Molecular Alignment Gives Monolayers the Edge in Bendable Semiconductor Michael Toney and Stefan Mannsfeld at the Stanford Synchrotron Radiation Lightsource. (Photo by Lauren Schenkman. Click for larger image.)
Reprogrammable product tags, bendable displays and flexible solar cells—the field of organic semiconductor research is advancing these possibilities toward reality. By layering hydrocarbon molecules on thin plastic sheets, scientists can make flexible electronics on the cheap. A team of researchers at the Stanford Synchrotron Radiation Lightsource has recently shed new light on how organic semiconductors function as transistors. Staff scientists Stefan Mannsfeld and Michael Toney and Zhenan Bao of Stanford University used SSRL's bright X-rays to determine how pentacene molecules, chains of five interlinked hydrocarbon rings, are organized in a monolayer—a layer only one molecule thick. Their results were published online March 19 in Advanced Materials. "If you want to understand why pentacene performs so well, or differently when deposited on one kind of surface versus another kind, you would need to know the packing in the first few molecular layers," Mannsfeld said. Pentacene is one of the best candidates for making transistors for bendable electronics, and is therefore considered a reference point in organic semiconductor research. Though it's no match for silicon when it comes to computing speeds, it is inexpensive, reliable and easy to process. It has been thoroughly studied, but one of its properties has remained a mystery: why don't electrons flow as well through a pentacene crystal as they do through a thin film, layered on a surface? Read more...  Required Computer Security Training Now OnlineIf you have a SLAC computing account, including Windows, Linux/Unix/Solaris or VMS account used to access SLAC information resources, you are required to take a computer security awareness course yearly. (See page 9 of the SLAC Cyber Security Policy.) If this requirement is not met, your SLAC account(s) will be disabled. The course, Cyber Security Basics, is now available through the SLAC Training portal. To satisfy the training requirement you must successfully pass the quiz with a score of 80 percent or higher. If you feel you have sufficient basic computer security knowledge, you can challenge the material by taking the test without reviewing the course. The course is available from any computer that has the latest versions of Java and Flash installed. You must have a SLAC System ID (the number associated with you in the SLAC Directory) and the password. For more information see the Training – SkillSoft FAQ. All SLAC accounts will receive an email with more information. If you have any questions, please contact Marilyn Cariola (x2820) or e-mail Computer Security Training. Transition to Office 2007: Classes OfferedIn June, SLAC will begin to migrate to MS 2007. To assist employees with the learning curve, classes will be offered twice a month on Wednesdays in the Computer Training Room, Building 50, Room 111. On Wednesday, April 15, two classes will be offered in Excel and Word: Excel Transition from 2003 to 2007 (SLAC-1137) The course fee for each is $195. STAP funds apply. See the full announcement for more details. |
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