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Ebook Flexible and stretchable medical devices: Part 2

Part 2 book “Flexible and stretchable medical devices” has contents: Flexible floating gate memory, flexible and stretchable wireless systems, conductive nanosheets for ultra-conformable smart electronics, flexible health-monitoring devices/sensors, implantable flexible sensors for neural recordings, and other contents. | 215 9 Flexible Floating Gate Memory Ye Zhou 1,2 , Su-Ting Han 1,3 , and Arul Lenus Roy Vellaisamy 1 1 City University of Hong Kong, Department of Materials Science and Engineering, College of Science and Engineering, Tat Chee Avenue, Kowloon, Hong Kong, SAR, P.R. China 2 Shenzhen University, Division of Physics, Institute for Advanced Study, Nanhai Avenue, 3688, Shenzhen, Guangdong, P.R. China 3 Shenzhen University, College of Electronic Science and Technology, Department of Microelectronics, Nanhai Avenue, 3688, Shenzhen, Guangdong, P.R. China 9.1 Introduction In modern era, electronic devices such as sensors, displays, and actuators are migrating toward thin and lightweight. As essential components required in various electronic devices, memories are more and more desirable in flexible or wearable devices. It is crucial to have flexible nonvolatile memory devices that possess high density, high speed, and low power consumption. Despite considerable achievements in flexible electronic devices, including integrated circuits (ICs), organic light-emitting diodes (OLEDs), and sensors, nonvolatile memories remain under-exploited [1]. Nowadays, flash memory devices are basically constructed by field effect transistors (FETs) with floating gate design. FET structure has several merits compared with capacitor or resistor memory structures. It is compatible with IC such as NAND and NOR and also the current complementary metal–oxide–semiconductor (CMOS) process. It can be also used for single transistor realization and nondestructive read-out [2–4]. The floating gate structure is widely used in the electronic market nowadays due to their excellent retention performance, capability for multibit storage, and suitability for ICs with various functions [5]. This chapter focuses on the flexible floating gate memories. We begin with the fundamentals of electronic memories and then describe the basics and the theory of floating gate memory followed by the operating principles of floating .