| Full text | |
| Author(s): |
Vieira, Douglas Henrique
;
Nogueira, Gabriel Leonardo
;
de Oliveira, Rafael Furlan
;
Gomes, Henrique Leonel
;
Alves, Neri
Total Authors: 5
|
| Document type: | Journal article |
| Source: | ACS APPLIED ELECTRONIC MATERIALS; v. 7, n. 17, p. 11-pg., 2025-08-28. |
| Abstract | |
This study reports the fabrication and electrical characterization of metal-electrolyte-semiconductor (MES) capacitors based on printed ZnO as a semiconducting layer and a cellulose-based eco-friendly electrolyte. The results demonstrate that MES capacitors behave similarly to their solid-state metal-insulator-semiconductor (MIS) counterparts. Capacitance-voltage measurements show well-defined charge saturation and depletion plateaus, and the Mott-Schottky plots exhibit the expected linear behavior, allowing the extraction of the semiconductor free carrier density. Upon UV light exposure with varying irradiance, the flat-band voltage shifts consistently with a light-induced increase in free carrier density, and the capacitance increases due to trap filling. These behaviors are confirmed by measurements using a phototransistor structure. The frequency response of the MES capacitors also reveals low-frequency relaxation peaks in the capacitance spectrum, which align with a continuous distribution of interface state density reaching approximately similar to 4.86 x 1013 cm-2<middle dot>eV-1. These findings confirm that MES capacitors can effectively quantify electronic states at the electrolyte/semiconductor interface. This capability, along with a high capacitance ratio [C light - C dark]/C dark at very low voltages, is particularly valuable for applying MES devices in a wide range of sensing applications, especially in field-effect photodetectors. (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: | 21/06238-5 - Functionalized solution-processed 2D materials: development of prototyping electric sensors and biosensors |
| Grantee: | Rafael Furlan de Oliveira |
| Support Opportunities: | Research Grants - Young Investigators Grants |