High-performance
operationally stable organic field-effect transistors
were successfully fabricated on a PowerCoat HD 230 paper substrate
with a TIPS-pentacene:polystyrene blend as the active layer and poly(4-vinylphenol)/HfO2 as the hybrid gate dielectric. The fabricated devices exhibited
excellent p-channel characteristics with a maximum and av field effect
mobility of 0.44 and 0.22(±0.11) cm2 V–1 s–1, respectively, av threshold voltage of 0.021(±0.63)
V, and current on–off ratio of ∼105 while
operating at −10 V. These devices exhibited remarkable stability
under effects of gate bias stress and large number of repeated transfer
scans with negligible performance spread. In addition, these devices
displayed very stable electrical characteristics after long exposure
periods to humidity and an excellent shelf life of more than 6 months
in ambient environment. Thermal stress at high temperatures however
deteriorates the device characteristics because of the generation
and propagation of cracks in the active semiconductor crystals. Furthermore,
novel paper-based phototransistors have been demonstrated with these
devices.
High-performance flexible organic field-effect transistors with natural protein gelatin as a dielectric layer and solution-processed TIPS-pentacene as an active layer were fabricated on a flexible poly(ethyleneterephthalate) substrate. The fabricated devices exhibited high performance and electromechanical stability, demonstrating high field-effect mobility with near-zero threshold voltage and the I on to I off ratio approaching 10 5 with a low operating voltage of −5 V. Devices exhibited highly stable electrical characteristics under multiple transfer scan measurements. The flexible nature of these devices was tested through the tensile strain test by subjecting them to a 5 mm bending radius. High electromechanical stability was observed with minuscule variation in the electrical parameters under strain application. These flexible devices were demonstrated for circuit and sensing applications. Under the humidity exposure test, the devices responded quickly with rapid response and recovery time and acted as a humidity sensor. This property was utilized for real time health monitoring applications by testing these devices as a breath rate analyzer. In addition, to test the credibility of these flexible devices in circuit applications, the external load invertor circuits were demonstrated before and after applying strain to these devices.
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