Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

Browse

Filters

2011 - 201912020 - 20241

Settings

Publication Index: search.filters.publicationIndex.ScopusSubject: search.filters.subject.Semiconductor

Search Results

Now showing 1 - 2 of 2
  • Article
    Investigation of the Experimental and Theoretical Band Gap of Pbvo3cl for Use in Energy Conversion Devices
    (Pergamon-elsevier Science Ltd, 2024) Harmanli, Ipek; Aytekin, Ahmet; Gol, Emre Yusuf; Eanes, Mehtap; Karabudak, Engin
    The major goal of the research described in this paper is to investigate the structure of electronic band and band gap of the novel semiconductor lead (II) trioxovanadate (V) chloride (PbVO3Cl). 3 Cl). Depending on both experimental and theoretical (computational) results, the utility of PbVO3Cl 3 Cl as a semiconductor in solar fuel devices was discussed. The optical band gap was determined experimentally by applying Tauc Plot method to the absorption spectra of PbVO3Cl. 3 Cl. Additionally, computational approaches for the structure prediction of PbVO3Cl 3 Cl have been studied. The electronic band structures were examined theoretically using local density (LDA), generalized gradient (GGA), and hybrid (HSE06) approximations. PbVO3Cl, 3 Cl, which has an optical band gap of about 2.2 eV, has been shown to have promising photocatalytic properties. As a result of these approximations, the transition type of PbVO3Cl 3 Cl was determined as indirect. We also discussed the potential future application of PbVO3Cl 3 Cl in Lewis solar fuel devices as a combination of the photoanode and Si photocathode. And the solar efficiency of the PbVO3Cl-Si 3 Cl-Si double-layer semiconductor system was calculated. Further experimental proofs can be important.
  • Article
    Citation - WoS: 11
    Citation - Scopus: 11
    Effect of Alkali Metal Hydroxides on the Morphological Development and Optical Properties of Ceria Nanocubes Under Hydrothermal Conditions
    (American Scientific Publishers, 2011) Kepenekçi, Özlem; Eanes, Mehtap; Demir, Mustafa Mustafa
    Nanocrystalline cerium(IV) oxide (CeO2, ceriaceria) particles were produced via the hydrothermal treatment of cerium nitrate hexahydrate with various alkali metal hydroxides (MOH: M = Li, Na, K). Experimental conditions such as [MOH], reaction temperature, and reaction time were studied. Particle morphology as well as size of crystallites was precisely controlled by choice of experimental conditions. While rod-shaped particles were obtained at 120 C, well-defined nanocubes were formed at higher temperatures regardless of the choice of MOH. Examination of particle growth kinetics, in the final stages of crystallization, showed that particle growth rate is controlled by two different mechanisms. Grain boundary diffusion controls the particle growth in the presence of NaOH with an activation energy of 113.8 kj/mol and surface diffusion for LiOH ad KOH with the activation energy of 43.0–150.9 kj/mol, respectively. In addition, the particles exhibit strong violet and blue emissions at 400 nm and 370 nm. The former emission originates from excitation of a wide band gap of CeO2. The latter one is attributed to the trivalency of the cerium ion and appears to be sensitive to all the experimental conditions studied. Both extending reaction time and increasing temperature reduce the intensity of the 370 nm emission and increase the intensity of the 400 nm emission.