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JANUARY 2019 I FLEX007 MAGAZINE 55 not fully informative, and some components or component types may require special atten- tion. This list of documented items is comprehen- sive, but not exhaustive. Since each design is unique, it is inevitable that there will be some information that varies depending on the prod- uct. Designers and product engineers will often place special requirements on individual flex circuit designs. The key takeaway here is that the documentation package should be as com- plete as possible to ensure, to the highest degree possible, that the product will be right the first time. Once again repeated here for emphasis, the documentation pack- age provided to the fabricator is the primary means of communication, and its clarity and completeness will prevent confusion, loss of irrecoverable time, and unnecessary expense. Conclusion Flex and rigid-flex circuits have proven their utility and value in countless products since their introduction. It is likely that they will continue to be chosen and used to help facili- tate and improve the ever-expanding range of electronic products in use around the globe today. However, as has been shown, there are many issues related to their design and manu- facture that require proper consideration and expertise to fully address. We recommend that those about to embark on a flex circuit project seek expert consultation to ensure first-pass success. FLEX007 Visit I-007eBooks to download your copy of American Standard Circuits' micro eBooks today: • The Printed Circuit Designer's Guide to Flex and Rigid-Flex Fundamentals • The Printed Circuit Designer's Guide to Fundamentals of RF/Microwave PCBs Dave Lackey is vice president of business development at American Standard Circuits. Anaya Vardya is president and CEO of American Standard Circuits. DPA-based OPTs also show high stability in the air," says Dr. Deyang Li. Dr. Saeed Amirjalayer adds, "By combining our experi- mental data with atomistic simulation, we are, in addition, able to explain the high performance of our device, which is important for a rational development of these devices." The WWU researchers believe that, therefore, DPA offers great opportunity towards high-performance OPTs for both fundamental research and practical applications such as sensor technology or data transfer. The research was published in the latest issue of Nature Communications. The work was funded by the German Research Foundation. (Source: University of Münster) Researchers from the Physical Institute and Center for Nanotechnology (CeNTech) at the University of Münster, headed by Prof. Dr. Harald Fuchs, together with colleagues from China, have developed a novel thin-film organic phototransistor (OPT) array based on a small-molecule (2, 6-diphenylanthracene—DPA). It has a strong fluo- rescence anthracene as the semiconducting core and phenyl groups at 2 and 6 positions of anthracene to balance the mobility and optoelectronic properties. The fabricated small-molecule OPT device shows high photo- sensitivity, photoresponsivity and detectivity. "The reported values are all superior to state-of-the- art OPTs and among the best results of all previously reported phototransistors to date. At the same time, our Nanophysicists Develop High-performance Organic Phototransistor

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