Przeglądanie według Autor "Potera, Piotr"

Aktualnie wyświetlane 1 - 8 z 8

Characteristics of TiO2, Cu2O, and TiO2/Cu2O thin films for application in PV devices
(AIP Advance, 2019) Sawicka-Chudy, Paulina; Sibiński, Maciej; Pawełek, Ryszard; Wisz, Grzegorz; Cieniek, Bogumił; Potera, Piotr; Szczepan, Patryk; Adamiak, Stanisław; Cholewa, Marian; Głowa, Łukasz
Several Cu2O and TiO2 thin films and four additional TiO2/Cu2O structures were fabricated by direct current (DC) magnetron sputtering. The process parameters were selected on the basis of earlier studies and numerical simulations. We examined the morphology of a cross-section of the PV structures, roughness and topography, and the transmission spectra of the thin films. Additionally, the properties of the samples were determined by X-ray diffraction. Next, the morphology cross-sectional and layer compositions of the solar cells was evaluated by scanning electron microscopy. Only one of the TiO2/Cu2O structures appeared smooth and homogeneous with columnar-type growth. For the as-grown films, diffraction peaks were observed and identified as brookite, rutile, CuO, and Cu2O and the average roughness of the samples was 0.5, 1.2, 5.4, and 4.0 nm, respectively. Finally, the transmission spectra of the thin films were recorded. Transmission and reflection spectra of ultraviolet-visible spectroscopy were analyzed, and the optical band gap and absorption coefficient of the oxidized layers were calculated. In the region of 400 to 1000 nm, transmittance varied from 5% to 70% in the TiO2 samples, and from 15% to 40% in the Cu2O samples, and reflectance of the TiO2 and Cu2O samples ranged from 20% to 90%. In the region of 1.5 eV to 3.5 eV, the mean absorption coefficient varied from ∼105 1/cm to ∼3 · 105 1/cm for TiO2 thin film, and from ∼2 · 105 to ∼6 · 105 1/cm for Cu2O thin film. The optical band gap values of the samples shifted slightly toward bulk anatase-3.5 eV, bulk rutile-3.1 eV, and copper(I) oxide. Finally, silver contacts were used for the electrodes. One of the fabricated TiO2/Cu2O PV structures was found to be sensitive to electromagnetic radiance during the experiment.
Color Centers in Ca4GdO(BO3)3 Single Crystals Irradiated by Gamma Quanta
(ACTA PHYSICA POLONICA A 124, (2013) 122-124, 2013) Potera, Piotr; Lukasiewicz, T.; Piecuch, Aleksander
Efekty termomodernizacji ścian zewnętrznych i modernizacji systemu grzewczego
(Energia i Budynek, 2012) Potera, Piotr
W artykule wyprowadzono formuły półempiryczne na zmniejszenie sezonowego zapotrzebowania ciepła i obciążenia cieplnego budynków w wyniku termomodernizacji ścian zewnętrznych
Effect of pre-growth annealing of the properties on nonpurified cadmium telleuride single crystals obtained by sublimation method
(Ukr. J. Phys. 57(8), 2012, pp 844-848, 2012) Popovych, V.D.; Gnatenko, Yu.P.; Bukyvskij, P.M.; Potera, Piotr
Stable absorption induced in Ca0,28Ba0,72Nb2O6 crystals by gamma quanta irradiation
(Proceedings of International confernce OMEE2014, pp. 165, 2014) Potera, Piotr; Lukasiewicz, T.; Zhydachevskii, Y.
Time decay of stable absorption of gamma irradiated lithium niobate crystals doped by cuprum ions
(Proceedings of International Conference Oxide Materials for Electronic Engineering 2012, pp 165-166, 2012) Potera, Piotr
The transient and stable color centers in pure and doped lithium niobate crystals (LNO) have been investigated in several works, for example in [1]. The stable color centers are centers which have lifetime higher then 1s. Unfortunately, the lifetime of color centers were studied in literature only for transient color centers, for example in [2]. In this work the lifetime of stable additional absorption induced by gamma irradiation in Cu doped of LNO crystal will be determined from data obtained during 10 years.
Time Decay of Stable Absorption of Gamma Irradiated LNO, LNO:Cu and YAP:Ce Crystals
(Acta Physica Polonica 126(3), (2014), 774-776, 2014) Potera, Piotr
Time decay of stable absorption of gamma irradiated LNO:Cu and YAP:Ce crystals
(Materiały konferencji LTLA 2013, pp. 28-29,, 2013) Potera, Piotr; Stefaniuk, Ireneusz