Abstract

Flexible and transparent electrodes of Cu2-XSe with charge transport via direct tunneling effect.
SILVA, Silésia de Fátima Curcino da; ZANATTA, Bruno S.; RABELO, Adriano César; BOTTECCHIA, Otávio Luiz; TOZONI, José Roberto; OLIVEIRA JUNIOR, Osvaldo Novais de; MARLETTA, Alexandre.
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 O 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.
Advanced Electronic Materials
v. 7, n. 5, p. 2001189-1-2001189-10 - Ano: 2021
Fator de Impacto: 6,593
    @article={003029986,author = {SILVA, Silésia de Fátima Curcino da; ZANATTA, Bruno S.; RABELO, Adriano César; BOTTECCHIA, Otávio Luiz; TOZONI, José Roberto; OLIVEIRA JUNIOR, Osvaldo Novais de; MARLETTA, Alexandre.},title={Flexible and transparent electrodes of Cu2-XSe with charge transport via direct tunneling effect},journal={Advanced Electronic Materials},note={v. 7, n. 5, p. 2001189-1-2001189-10},year={2021}}

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