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Structural, morphological and transport properties of nanostructured La1-Sr Co0.2Fe0.8O3- thin films, deposited by ultrasonic spray pyrolysis
摘要： The main aim of this study is to improve the electrochemical properties of LaFeO3-δ perovskite as cathode by strontium and cobalt doping in lanthanum and iron sites. Ultrasonic spray pyrolysis (USP) following sintering process in air was utilized to synthesize La1-xSrxCo0.2Fe0.8O3-δ (LSCF) with 0 ≤ x ≤ 0.4. X–ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and impedance spectroscopy techniques were used to study the structure, surface morphology and transport properties of the deposited films. Contrary to what might expect, up to x = 0.4, single orthorhombic phase of La1-xSrxCo0.2Fe0.8O3-δ have been obtained for all deposited films. Impedance spectroscopy results at intermediate temperatures (500–700 °C) indicated that by increasing of strontium, the conductivity increases, and activation energy decreases from 0.41 eV for x = 0–0.24 eV for x = 0.4.
关键词： IT-SOFC,LSCF,Ultrasonic spray pyrolysis
更新于2025-09-23 15:22:29
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Bifacial IFO/(n+pp+)Cz-Si/ITO solar cells with full-area Al-alloyed BSF and Ag-free multi-wire metallization suitable for low-concentration systems
摘要： Bifacial solar cells have received considerable attention due to the potential to achieve higher energy yield compared to monofacial cells. However, in bifacial cells, p+-Si layers are usually produced by boron diffusion, which makes such cells more expensive compared to monofacial cells with a full-area screen-printed Al-alloyed Al-p+ back-surface-field (BSF). Recently, we have demonstrated proof-of-concept that bifacial cells, which, in addition, are also suitable for application in low-concentration systems (3–6 suns), can be produced from commercially available, standard monofacial SiNx/(n+pp+)Cz-Si/Al structures with full-area Al-p+-BSF. For this purpose, the residual Al paste was removed and a number of solar cells were prepared differing in the sheet resistance of the Al-p+-BSF (Rp+), which was varied from 14 Ω/sq to 123 Ω/sq by thinning the Al-p+ layer using one-sided etch-back process. Thinning of the Al-p+-BSF significantly improved the efficiency under 1-sun front/rear-side illumination: from 16.0%/7.5% (at Rp+ = 14 Ω/sq) to 17.5%/11.2% (at Rp+ = 81 Ω/sq). The equivalent efficiency at 1-sun front illumination and 20/50% albedo of 1-sun illumination increased from 17.7%/20.1% (at Rp+ = 14 Ω/sq) to 19.9%/23.5% (at Rp+ = 81 Ω/sq). In this paper, we present the results of systematic study of the developed bifacial cells. Thinning-induced changes in the properties of the cells are analyzed in detail. The critical aspects which might explain the performance of the developed cells are addressed. In addition, bifacial cells are compared with standard monofacial cells fabricated using the precursor of the same batch.
关键词： Ultrasonic spray pyrolysis,Transparent conductive oxide,Ag-cost reduction,Bifacial concentrator silicon solar cell,Multi-wire metallization,Al-alloyed BSF
更新于2025-09-19 17:13:59
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Semitransparent Sb <sub/>2</sub> S <sub/>3</sub> thin film solar cells by ultrasonic spray pyrolysis for use in solar windows
摘要： The integration of photovoltaic (PV) solar energy in zero-energy buildings requires durable and efficient solar windows composed of lightweight and semitransparent thin film solar cells. Inorganic materials with a high optical absorption coefficient, such as Sb2S3 (>105 cm?1 at 450 nm), offer semitransparency, appreciable efficiency, and long-term durability at low cost. Oxide-free throughout the Sb2S3 layer thickness, as confirmed by combined studies of energy dispersive X-ray spectroscopy and synchrotron soft X-ray emission spectroscopy, semitransparent Sb2S3 thin films can be rapidly grown in air by the area-scalable ultrasonic spray pyrolysis method. Integrated into a ITO/TiO2/Sb2S3/P3HT/Au solar cell, a power conversion efficiency (PCE) of 5.5% at air mass 1.5 global (AM1.5G) is achieved, which is a record among spray-deposited Sb2S3 solar cells. An average visible transparency (AVT) of 26% of the back-contact-less ITO/TiO2/Sb2S3 solar cell stack in the wavelength range of 380–740 nm is attained by tuning the Sb2S3 absorber thickness to 100 nm. In scale-up from mm2 to cm2 areas, the Sb2S3 hybrid solar cells show a decrease in efficiency of only 3.2% for an 88 mm2 Sb2S3 solar cell, which retains 70% relative efficiency after one year of non-encapsulated storage. A cell with a PCE of 3.9% at 1 sun shows a PCE of 7.4% at 0.1 sun, attesting to the applicability of these solar cells for light harvesting under cloud cover.
关键词： solar windows,ultrasonic spray pyrolysis,antimony sulfide,semitransparent solar cells,thin films
更新于2025-09-12 10:27:22
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Structure–Activity/Stability Correlations from the Electrochemical Dynamic Responses of Titanium Anode Coatings Formed of Ordered TiO <sub/>2</sub> @RuO <sub/>2</sub> Microspheres
摘要： Spherical TiO2/RuO2 particles were synthesized by ultrasonic spray pyrolysis (USP) at 200 and 800?C. The activity for the oxygen and chlorine evolution reactions (OER and CER, respectively) and the dynamic responses from electrochemical impedance spectroscopy (EIS) of the USP powders, as well as of the corresponding coatings on Ti, were analyzed and are discussed. The loss of coating activity is discussed with respect to the differences in the EIS and cyclic voltammetry responses of the coatings in their active and inactive states. The 800?C-USP sample was found to be more active than the 200?C-USP sample for both the CER and the OER, whereas the stability of the former was considerably lower. The correlation between the structure, composition and morphology of the powder and the coating with the registered electrochemical properties is discussed. The EIS analysis of the coating resistance distributions induced by the thermal treatment of the powder indicated a complex combination of the pore resistance and the pseudocapacitive charge transfer resistance. An additional coating resistance, due to loose grain boundaries, was introduced into the coatings in their active and inactive state. The EIS analysis indicated the changes in TiO2-enriched core/RuO2-enriched shell structure, caused by the USP temperature.
关键词： TiO2/RuO2,cyclic voltammetry,electrochemical impedance spectroscopy,oxygen evolution reaction,chlorine evolution reaction,ultrasonic spray pyrolysis,coating stability
更新于2025-09-11 14:15:04