| Full text | |
| Author(s): |
Silva, Silesia F. C.
;
Zanatta, Bruno S.
;
Rabelo, Adriano C.
;
Bottecchia, Otavio L.
;
Tozoni, Jose R.
;
Oliveira, Osvaldo N., Jr.
;
Marletta, Alexandre
Total Authors: 7
|
| Document type: | Journal article |
| Source: | ADVANCED ELECTRONIC MATERIALS; v. 7, n. 5, p. 10-pg., 2021-04-08. |
| Abstract | |
In this paper, it is demonstrated that copper selenide (Cu2-XSe) films onto polyester sheets may serve as transparent electrodes in inorganic-organic hybrid light emission devices (IOHLED), as possible replacement to indium tin oxide or fluorine-doped tin oxide. The Cu2-XSe film synthesized via bath chemical deposition is electrically stable with a sheet resistance of 148 omega sq(-1) and optical bandgap of 2.3 eV. IOHLED are made with poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) as an organic layer for hole transport and poly[2-metoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) as electroluminescent semiconductor. The IOHLED emits in the visible range owing to the simultaneous emission from Cu2-XSe and MEH-PPV layers. The enhanced performance is explained by analyzing the charge transport mechanisms at the inorganic-organic interface, which for Cu2-XSe/PEDOT:PSS changes from Fowler-Nordheim to direct tunneling regardless of the device temperature (90-370 K). The onset voltage is 75% smaller than in the absence of the PEDOT:PSS layer due to a 27 meV decrease in the potential barrier, and the direct tunneling becomes more relevant to device performance than the sheet resistance of the Cu2-XSe layer. Upon adding transparency, mechanical flexibility, and covering large areas, the ultrathin Cu2-XSe films on polyester substrates permit new designs for electro-optical devices with inorganic-organic heterojunctions. (AU) | |
| FAPESP's process: | 18/22214-6 - Towards a convergence of technologies: from sensing and biosensing to information visualization and machine learning for data analysis in clinical diagnosis |
| Grantee: | Osvaldo Novais de Oliveira Junior |
| Support Opportunities: | Research Projects - Thematic Grants |