The effect of B 2 O 3 /CdO substitution on structural, thermal, and optical properties of new black PVB/Cd semiconductin
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The effect of B2O3/CdO substitution on structural, thermal, and optical properties of new black PVB/Cd semiconducting oxide glasses Gokhan Kilic1 · Erkan Ilik1 · U. Gokhan Issever1 · Mehmet Peker1 Received: 11 April 2020 / Accepted: 31 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Novel semiconducting P 2O5–V2O5–(B2O3/CdO) oxide glasses containing high ratios of V 2O5 and P 2O5 were synthesized with melting–quenching method and their characterizations were performed. B2O3 were gradually replaced with CdO within the structure. Structural characteristics of the synthesized glasses were determined with XRD, SEM–EDS, and Fourier transform infrared spectroscopy (FTIR) with diamond ATR. Amorphous character of the glasses was determined with XRD and supported additionally with SEM images. The presence of CdO within the structure was confirmed with EDX spectrum. Structural units of vanadium, phosphate, and boron were determined with FTIR examination. CdO was observed to be present in the structure as a modifier. According to DSC data, glass transition (Tg), crystallization (Tc), melting (Tm) temperatures, and thermal stabilities (ΔT) were determined, and their relation with B 2O3/CdO substitution was explained. According to DSC data, Tg decreased to 425 °C from 431 °C with the replacement of B2O3 with CdO; Tc, increased to 509 °C from 494 °C. Thermal stabilities of the synthesized glass samples increased to 84 °C from 63 °C. Transmittance and absorption spectra were obtained between the range of 200–3000 nm, and the transmittance belonging to the samples was observed to start around 1800 nm. Direct and indirect optical band gaps were determined with Tauc method. In addition, Urbach energies of the samples were determined and obtained results were evaluated. The newly synthesized cadmium–vanadium–phosphate glass is appropriate to be used as an absorbent layer in solar energy systems. Keywords Semiconducting glass · Borophosphate glass · Vanadium–phophate glass · V2O5 · CdO
1 Introduction V2O5 are also known as glass former in addition to the most commonly used SiO2, P2O5, and B2O3, among which B2O3 is known as the best glass former [1]. Due to their technological applications, optical, physical, mechanical, electrical, and magnetic properties of pure rare-earth metal-doped alkali/alkaline earth borate glasses with various transitions are under intensive examination [2]. Due to interesting * Gokhan Kilic [email protected] Erkan Ilik [email protected] U. Gokhan Issever [email protected] Mehmet Peker [email protected] 1
Department of Physics, Faculty of Science and Letters, Eskisehir Osmangazi University, 26040 Eskisehir, Turkey
electrical, optical, and magnetic properties of transition metal-doped glasses, many studies are found in the literature [3–14], but a few studies have been conducted on glasses containing high levels of vanadium oxide. These glasses have semiconducting properties, since they contain V+4 and V+5 valence states [2, 15–21]. Vanadium-doped gla
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