High Performance Flexible Transistors With Polyelectrolyte/Polymer Bilayer Dielectric

Edible Dielectric Composite for the Enhancement of Performance and Electromechanical Stability of Eco-Friendly Flexible Organic Transistors

“…For the same, a 2 wt % chitosan solution in aqueous acetic acid was prepared by stirring at 50 °C for 6 h. Similarly, 10 wt % gelatin solution in DI water was prepared by stirring at 60 °C for 2.5 h. Both the prepared solutions were mixed with different gelatin/chitosan ratios, that is, with 10:0, 10:1, 10:5, and 10:10, and stirred for 1 h. These composite solutions were spin-coated at 2000 rpm for 60 s and annealed at room temperature for 24 h to form thin films of gelatin/chitosan edible dielectrics. TIPS-pentacene/PS blend was prepared and deposited over the dielectric film through drop-casting as explained earlier. , Finally, gold (Au) source/drain top contacts were deposited through shadow mask. Surface morphology for all dielectric composite films was investigated with the help of AFM images.…”

“…In the ongoing era of sustainable technological advancements toward smart systems for human society, flexible electronics is playing an important role with its wide range of applications in portable, wearable, biomedical, artificial skin, e-textile, implantable, and biological electronics. − Polymers with inherent properties of solution processability, low-temperature processing, lightweight, and soft nature enable this technology for high throughput and large area electronics. , However, the fast growth of uses of consumer electronics has caused a severe increase in electronic waste imposing extreme risks to the environment and health of humans and related habitats including animals and ecology. To address these challenges, biodegradable electronics has been considered as a potential alternative for electronic products that can be decomposed into non-hazardous byproducts after the lifespan of devices. − This area offers enormous potential for the next generation flexible electronics and requires extensive exploration of various material components of the devices including organic and nature-originated substances enhancing the degree of eco-friendliness and biodegradability.…”

“…The effect of enhanced properties of this composite is comprehensively investigated on various performance parameters for flexible organic transistors. For the same, different gelatin/chitosan ratios of 10:0, 10:1, 10:5, and 10:10 were explored in a combination of air-stable solution-processed semiconductor polymer blend TIPS-pentacene/polystyrene (PS) , for p-channel transistor performance. All types of fabricated devices exhibited excellent p-channel performance for −5 V operation.…”

Multifunctional Flexible Organic Transistors with a High-k/Natural Protein Bilayer Gate Dielectric for Circuit and Sensing Applications

“…Polymer gate insulators have been considered to be promising candidates for solution-processed flexible OFETs due to their suitability for flexible and largearea processability and the formation of a high-quality dielectric:semiconductor interface. 6,14,15 In general, most of these polymer dielectrics have a low dielectric constant (2−5), which poses a critical challenge in obtaining a low operating voltage. 2 Combining these polymer layers with thin high-k metal oxide dielectrics helps in achieving highly oriented semiconductor layers on top of the dielectric and can efficiently protect the channel from external trap-forming moieties.…”

“…In the current era of the Internet of Things (IoT), flexible electronics has been considered to be one of the most emerging research areas which has garnered significant recognition because of its promising applications in circuits, sensors, radio frequency identification (RFID) tags, rollable displays, human health monitoring, e-textiles, and wearable devices, as well as implantable electronics. − An organic field-effect transistor (OFET) is an essential building block of flexible electronics that has gained tremendous popularity due to its inherent advantages of solution processability, low-temperature processing, ease of integration, low-cost fabrication, and compatibility with rigid as well as flexible substrates such as cloth, paper, plastic skin, etc. ,− The performance of OFETs is determined by various factors starting from the properties of the substrate to the organic semiconductor material, the dielectric, the device structure, and the semiconductor:dielectric interface. ,− A high-quality dielectric:semiconductor interface is preferred to reduce the charge trapping, which is influenced by various factors such as structural defects in the semiconductor film or grain boundaries, surface roughness, polar functional groups, and dielectric constant ( k ) of the gate dielectric. ,− Significant efforts have been made to improve the interfacial properties of the semiconductor:dielectric by introducing hydrophobic self-assembled monolayers (SAMs) or ultrathin polymer films; , however, these inorganic dielectric/SAM combinations lack device flexibility overall. Polymer gate insulators have been considered to be promising candidates for solution-processed flexible OFETs due to their suitability for flexible and large-area processability and the formation of a high-quality dielectric:semiconductor interface. ,, In general, most of these polymer dielectrics have a low dielectric constant (2–5), which poses a critical challenge in obtaining a low operating voltage . Combining these polymer layers with thin high- k metal oxide dielectrics helps in achieving highly oriented semiconductor layers on top of the dielectric and can efficiently protect the channel from external trap-forming moieties .…”