ZnO-based electrolyte-gated transistor (EGT) applied as multiparametric UV-sensing device

Author(s)

Vieira, Douglas Henrique ; Nogueira, Gabriel Leonardo ; Morais, Rogerio Miranda ; Fugikawa-Santos, Lucas ; Seidel, Keli Fabiana ; Alves, Neri

• Document type: Journal article
• Source: SENSORS AND ACTUATORS A-PHYSICAL; v. 347, p. 9-pg., 2022-11-11.

Abstract

Transistors based in solution-processable semiconducting metal oxides stands out for disposable, printed and wearable electronics. Here we report a transparent and printed ZnO-based electrolyte-gated transistor (EGT), using cellulose electrolyte, which exhibited low-voltage operation, below 2 V, threshold voltage of 0.16 V, high on-state current of 0.3 mA, I-on/I-off ratio of 3.0 x 10(5) and field-effect mobility of 0.17 cm(2)/Vs. We have demonstrated that such EGT can be applied as an ultraviolet sensing device, showing multiparametric response with shift in its: threshold voltage (VT), subthreshold swing (S), transconductance (gm) and enhancement in the field-effect mobility in saturation regime (mu s) when exposed to different UV irradiance levels. This device achieves high IUV/Idark ratio, responsivity and EQE of 1 x 10(5), 8.4 x 10(4) A/W and 2.7 x 10(6)%, respectively, presenting very stable properties when tested in ambient atmosphere, without encapsulation, and with no visible effects of ageing during the period of observation. The variation in the transistor parameters and the high values of the figures of merit for photodetectors, categorize this EGT as a multiparametric UV sensor with good performance and compatible with printed and transparent electronics. (AU)

• FAPESP's process: 19/08019-9 - Transparent/flexible transistors: from the study of transport properties to the development of circuitries
• Grantee: Lucas Fugikawa Santos
• Support Opportunities: Regular Research Grants
• FAPESP's process: 20/12282-4 - Development of vertical electrolyte-gated field effect transistors for UV photodetectors
• Grantee: Douglas Henrique Vieira
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 18/02037-2 - Development of all-printed vertical field-effect transistor
• Grantee: Gabriel Leonardo Nogueira
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 18/04169-3 - Development of a UV photodetector using a Schottky diode and a transistor based on ZnO by spray pyrolysis
• Grantee: Douglas Henrique Vieira
• Support Opportunities: Scholarships in Brazil - Master