Photochromic Materials Towards Energy Harvesting

Magalhães-Mota, Gonçalo; Farinha, Pedro; Sério, Susana; Ribeiro, Paulo A.; Raposo, Maria

doi:10.1007/978-3-319-98548-0_11

Cited by 1 publication

(1 citation statement)

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“…To understand why the previously presented devices exhibited a poor performance, a device with 50 bilayers was produced. The increase in the number of bilayers is expected to prevent the aluminum migration inside the device, which occurred in previous works carried out by the group [34], although the SEM characterization did not reveal such an effect. Moreover, this device was analyzed inside a desiccator, where the temperature ranged from 20 • C to 23 • C, with a very low relative humidity, varying from 10% and 15%, because these parameters can also influence the characterization of the sample.…”

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: 75%

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: 75%