Influence of the thickness of electrochemically deposited polyaniline used as hole transporting layer on the behaviour of polymer light-emitting diodes

Electropolymerized polyaniline: A promising hole selective contact in organic photoelectrochemical cells

“…[25,26] In the oxidized state, conducting polymers like PANI are charge-balanced, « doped »with counter anions ('p-doping') and have a delocalized π-electron band structure. [4] The current density increases with both the number of cycles and the concentration of monomer as shown in Figure 2(b), which relates to the growth of the electroactive polyaniline films on the ITO substrate, directly increasing the thickness of the PANI layer during the successive cycles performed [27], in good correlation with the information provided by Table 1 can probably be related to the π-π * transition centered on the benzoid rings, and a second broad band from 500 nm to 700 nm, can be assigned to the polaron/bipolaron transitions caused by the interband charge transfer from benzoid to quinoid rings confirmed the doped polyaniline state. [26,29] On the other hand, according to Nekrasov et al, [30] the intense band at 350 nm (3.3 eV) is characteristic of the protonated forms of emeraldine salt, while the large one located from 500 nm to 700 nm, which appears when the potential range of electropolymerization increases up to 0.6 V, is a superposition of three important bands marked at ~ 570, ~ 665 (1.86 eV) , and 755 nm.…”

Eletropolimerização pulsada para confecção de camadas transportadoras de cargas foto-geradas em dispositivos fotovoltaicos orgânicos

“…A eletropolimerização é um método simples de preparação de filmes e garante controle das propriedades elétricas [13] , da espessura [14] e boa adesão a substratos [15,16] . Este método consiste na simultaneidade entre a síntese a partir do precursor, a anilina, e a deposição do polímero PAni sobre eletrodos e também tem sido utilizado para a confecção de diodos orgânicos emissores de luz (OLEDs) [17,18] . Neste trabalho, filmes de polianilina (PAni) obtidos eletroquimicamente, através da eletropolimerização potenciostática pulsada foram caracterizados e utilizados como camadas condutoras de portadores de cargas fotogeradas em células fotovoltaicas à base de polímeros conjugados.…”

Selenophene‐containing conjugated polymers for supercapacitor electrodes

“…Researchers search for new materials that can be used in device technology 1,2 . In recent years, conjugated polymers have been commonly used for various device applications such as organic solar cells (OSCs), 3–6 supercapacitors, sensors, energy storage devices, and light‐emitting display devices (LEDs) 7–11 …”