| Full text | |
| Author(s): |
Kumar, Dinesh
[1]
;
Gomes, Tiago Carneiro
[2, 1]
;
Alves, Neri
[3]
;
Fugikawa-Santos, Lucas
[2]
;
Smith, Graham C.
[4]
;
Kettle, Jeff
[1]
Total Authors: 6
|
| Affiliation: | [1] Bangor Univ, Sch Elect, Bangor LL57 1UT, Gwynedd - Wales
[2] Sao Paulo State Univ UNESP, Inst Geosci & Exact Sci, BR-13506900 Rio Claro, SP - Brazil
[3] Sao Paulo State Univ Unesp, Sch Technol & Sci, BR-19060900 Presidente Prudente - Brazil
[4] Univ Chester, Fac Sci & Engn, Chester CH2 4NU, Cheshire - England
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | IEEE SENSORS JOURNAL; v. 20, n. 14, p. 7532-7539, JULY15, 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
A comparison of Zinc Oxide (ZnO) phototransistors prepared by spray and sputter coating process is presented. The work shows that spray coated layers provide significant advantages in sensor response over ZnO phototransistors made by physical vapour deposition and we show that spray deposited ZnO phototransistors can exhibit state-of-the-art performances for UV photodetectors. Topographic images of the samples surface shows that there is increase in surface roughness in spray coated samples indicating increasing grain sizes, which is considered the source of the greater sensor responsivity. X-ray photoelectron spectroscopy (XPS) is also used to understand the root cause of the greater UV responsivity. It was observed that sprayed ZnO TFTs are more sensitive to UV radiation due to higher adsorption of oxygen level. Responsivity and external quantum efficiency (EQE) of the sprayed and sputtered ZnO TFTs are also evaluated. (AU) | |
| FAPESP's process: | 19/05620-3 - Bias stress testing of ZnO and IGZO transistors based on novel testing procedure |
| Grantee: | Lucas Fugikawa Santos |
| Support Opportunities: | Research Grants - Visiting Researcher Grant - International |
| FAPESP's process: | 14/13904-8 - Investigations on ZnO and TIPs-Pentacene based transistors for printed hybrid inverter circuit |
| Grantee: | Tiago Carneiro Gomes |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 16/03484-7 - Stability studies in transistors based on ZnO films produced by ultrasonic spray pyrolysis. |
| Grantee: | Tiago Carneiro Gomes |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |