Development of Hybrid Solar Cells based on TiO2 or ZnO-Graphene Oxide Heterojunctions

Carreira, Duarte; Ribeiro, Paulo A.; Raposo, M. Manuela M.; Sério, Susana

doi:10.5220/0009380801850191

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“…On the other hand, for ZnO-based devices, the results evidenced for the device with 20 bilayers a typical resistive behavior, where the current depends linearly on the applied voltage to the device terminals [31]. For all the measurements performed, no significant hysteresis effect was observed, and no change in its electrical behavior was detected when exposed to ambient light.…”

Section: Influence Of the Number Of Bilayers On The Electric Properties Of Fto/(pah/go)x/tio2/al And Fto/(pah/go)x/zno/al (X = 20 And 30)mentioning

confidence: 85%

“…PAH and GO LbL films were prepared with different numbers of layers, namely, 20, 30, and 50 bilayers. The growth of these films was previously characterized by measuring the UV-vis absorbance spectra as a function of the number of bilayers, and a linear film growth was detected, as is reported in detail elsewhere [31]. Although the aforementioned linearity is easily perceived, it should be noted that in the classic LbL technique, a linear film growth is not commonly detected in the adsorption of the first bilayers.…”

Section: Build-up Of Pah and Go Lbl Filmsmentioning

confidence: 87%

“…In the case of TiO 2 devices, the characterization was performed only in ambient light, in an environment without light interaction, and is reported in detail in [31]. For both devices, a linear dependence of the current with the applied voltage was observed, and thus, a resistive behavior, which was not expected.…”

Section: Influence Of the Number Of Bilayers On The Electric Properties Of Fto/(pah/go)x/tio2/al And Fto/(pah/go)x/zno/al (X = 20 And 30)mentioning

confidence: 99%

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Engineering of TiO2 or ZnO—Graphene Oxide Nanoheterojunctions for Hybrid Solar Cells Devices

et al. 2021

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It is currently of huge importance to find alternatives to fossil fuels to produce clean energy and to ensure the energy demands of modern society. In the present work, two types of hybrid solar cell devices were developed and characterized. The photoactive layers of the hybrid heterojunctions comprise poly (allylamine chloride) (PAH) and graphene oxide (GO) and TiO2 or ZnO films, which were deposited using the layer-by-layer technique and DC-reactive magnetron sputtering, respectively, onto fluorine-doped tin oxide (FTO)-coated glass substrates. Scanning electron microscopy evidenced a homogeneous inorganic layer, the surface morphology of which was dependent on the number of organic bilayers. The electrical characterization pointed out that FTO/(PAH/GO)50/TiO2/Al, FTO/(PAH/GO)30/ZnO/Al, and FTO/(PAH/GO)50/ZnO/Al architectures were the only ones to exhibit a diode behavior, and the last one experienced a decrease in current in a low-humidity environment. The (PAH/GO)20 impedance spectroscopy study further revealed the typical impedance of a parallel RC circuit for a dry environment, whereas in a humid environment, it approached the impedance of a series of three parallel RC circuits, indicating that water and oxygen contribute to other conduction processes. Finally, the achieved devices should be encapsulated to work successfully as solar cells.

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Section: Influence Of the Number Of Bilayers On The Electric Properties Of Fto/(pah/go)x/tio2/al And Fto/(pah/go)x/zno/al (X = 20 And 30)mentioning

confidence: 85%

Section: Build-up Of Pah and Go Lbl Filmsmentioning

confidence: 87%

Section: Influence Of the Number Of Bilayers On The Electric Properties Of Fto/(pah/go)x/tio2/al And Fto/(pah/go)x/zno/al (X = 20 And 30)mentioning

confidence: 99%

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