Charge-trap memory effect in spray deposited ZnO-based electrolyte-gated transistors operating at low voltage

Author(s)

Vieira, Douglas Henrique ; Nogueira, Gabriel Leonardo ; Nascimento, Mayk Rodrigues ; Fugikawa-Santos, Lucas ; Alves, Neri

• Document type: Journal article
• Source: CURRENT APPLIED PHYSICS; v. 53, p. 8-pg., 2023-07-08.

Abstract

Charge-trap memory phenomena were demonstrated in an electrolyte-gated transistor (EGT) using a spraycoated zinc oxide (ZnO) active layer and a cellulose-based electrolyte. The EGT exhibited efficient programming and erasing characteristics at low voltages, shifting the threshold voltage and the magnitude of the oncurrent. This behavior is discussed in terms of the influence of charged trapping states at the ZnO/electrolyte interface and within the ZnO bulk. The presence of these traps leads to a shift in the mobility from 0.57 & PLUSMN; 0.16 cm2 V-1 s-1 in the initial state to 0.02 & PLUSMN; 0.01 cm2 V-1 s-1 when programmed. Retention experiments revealed improved stability of the memory state when a low positive voltage is applied to the gate, indicating that the device's characteristics are extremely sensitive to the trapping/detrapping of charges at the semiconductor/ electrolyte interface. Capacitance spectroscopy measurements using planar and metal-insulator-semiconductor configurations within the same device were used to analyze the charging dynamics of the trap states at different programming states. (AU)

• 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: 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