Shooting flexible electronics
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https://doi.org/10.1007/s11467-020-1009-x
Front. Phys. 16(1), 13602 (2021)
VIEW & PERSPECTIVE
Shooting flexible electronics Carbon-rich materials are the key. Qichun Zhang Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China E-mail: [email protected]
T
he trends of the future electronic devices should be miniaturized, flexible, stable, portable, light, and highly integrated. Although flexible electronic products (i.e., flexible display products [1-3], batteries [4, 5], cell phones [6]) have been commercially available recently, which represents the starting of a new era in electronics, these progresses are still in their infancy and more efforts are required to boom their multifunction and speed up their marketization from lab. Considering their low-cost and mass-productive synthesis technologies, rich species, high performances, and especially, the excellent flexibility and stability, organic materials (insulating, conductive and semiconducting) have triggered the tide of the development of “plastic electronics”, especially in transistors, an indispensable logic device in these logic-control based devices (i.e., intelligent electronics). The applications of organic materials in flexible electronics have been widely witnessed. For example, in organic liquid crystal display (OLCD) devices, flexible transistors can be integrated on a flexible substrate to control the color distribution in every pixel via regulating the crystal liquid layer. Comparing with the traditional silicon-based LCD devices, the OLCD devices exhibit much lighter weight, thinner thickness and smaller bend radius. Another example is the flexible display device based on organic light-emitting diode (OLED), where flexible organic transistors directly control the light-emitting of diodes array with RGB colors. More recently, a two-inch wearable full-color active-matrix OLED display based on MoS2 backplane TFTs was reported to display high mobility (>18 cm2·V−1·s−1) and on/off ratio (> 107) [7]. Although the device can display both tension and compression status of the human skin, the efficiency decreasing at high current densities is a long-standing issue in *Received September 21, 2020. This article can also be found at
http://journal.hep.com.cn/fop/EN/10.1007/s11467-020-1009-x.
OLED devices. To address this issue, organic light-emitting transistors (OLETs) might be solution. OLET is a novel organic device with an ambipolar regime, which can transport both holes and electrons and offer a recombination zone [8]. Recently, a flexible OLET with a record external quantum efficiency (EQE) of about 9.0% has been demonstrated in inert atmosphere, paving the way to the application of OLET in flexible display devices [9]. The challenging research in flexible electronics is the circuit integration to perform multiple functions, especially the integration between bionic and intelligent electronics. E-skin is such a typical flexible device, which has great potential applications in future medical devices,
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