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Structural and optical analysis of Cr_2N thin films prepared by DC magnetron sputtering

International Journal of Minerals,Metallurgy and Materials 2015年第2期22卷 197-202页

作者： Shakil Khan A.Mahmood A.Shah Qaiser Raza Muhammad Asim Rasheed Ishaq Ahmad Department of Metallurgy and Materials Engineering Pakistan Institute of Engineering and Applied Sciences National Institute of Laser and Optronics (NILOP) National Centre for Physics Quaid-i-Azam University

Chromium nitride （Cr2N） thin films were prepared by a DC magnetron sputtering technique. The deposition temperature was raised from 50 to 300℃, and its influence on the film structure and refractive index was investigated. X-ray diffraction analysis shows that the crystalline strucure of the films transforms from the （101） to （002） oriented hexagonal CrzN phase as the increase of substrate tempera- ture above 50℃, and a highly texatred film grows at 100℃. An empirical relation between the crystalline orientation and infrared active modes of the films is obtained, i.e., the Fourier transform infrared （FTIR） spectrum of the film prepared at 50℃ exhibits only A1 （TO） mode. The prominent peak in the FTIR spectra of the film prepared above 50℃is assigned to the E1 （TO） mode and is correlated with the （002） or c-axis oriented hexagonal wurtzite phase of Cr2N. In the surface analysis of atomic force microscopy, a transformation from the featureless surface to columnar-type morphology is observed with the increase of substrate temperature from 50 to 100℃, exhibiting c-axis oriented crystallite growth. A further increase in substrate temperature to 200℃ causes the c-axis crystallites to merge, resulting in the formation of voids. The refractive index （n） of the deposited films is obtained using spectroscopic ellipsometry.

关键词： chromium nitride thin films magnetron sputtering structural analysis optical analysis refractive index

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Hexagonal yttrium manganite:A review on synthesis methods,physical properties and applications

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Journal of Rare Earths 2023年第1期41卷 19-31页

作者： Bhagyashree Munisha Bindhybasinee Mishra Jyotirmayee Nanda Centre for Nanoscience and Nanotechnology ITERS‘O’A(Deemed to be)UniversityKhandagiriBhubaneswar751030OdishaIndia Department of Physics ITERS‘O’A(Deemed to be)UniversityKhandagiriBhubaneswar751030OdishaIndia

Hexagonal rare-earth manganites have attracted considerable interest due to their complex multiferroic properties,and they possess a spontaneous electric polarization and may be utilized in various technological applications ranging from solar cells to non-volatile memories and light *** narrow bandgap of hexagonal rare-earth manganite-based compounds can perform remarkable optical anisotropy properties,which make these very efficient photovoltaic materials in parallel with the widely used TiO_(2)-based *** enlargement of the traditional field of hexagonal rare-earth manganite photocatalysis also arose in the last *** article imparts an extensive review of the rational synthesis,optical properties,structural characterization,and applications of hexagonal rare-earth *** properties of hexagonal rare-earth perovskite manganite are also emphasized,and a range of unique applications in photocatalysis and photovoltaics are ***,we wind up this review with some linear perspectives and future research in this area.

关键词： Yttrium manganite Multiferroic optical analysis Photocatalysis Photovoltaics Rare earths

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optical Design of a Solar Parabolic Concentrating Collector Based on Trapezoidal Reflective Petals

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Journal of Energy and Power Engineering 2015年第8期9卷 714-720页

作者： Sasa Pavlovic Velimir Stefanovic Darko Vasiljevic Emina Petrovic Thermal Engineering Department Faculty of Mechanical Engineering University of Nis Ni~ 18000 Serbia Institute of Physics Photonics Center Belgrade 11080 Serbia Mechatronic and Control System Faculty of Mechanical Engineering University of Nis Nis18000 Serbia

In this paper, detailed optical of the solar parabolic dish concentrator is presented. The system has diameter D = 2,800 mm and focal length f = 1,400 mm. The efficient conversion of solar radiation in heat at these temperature levels requires a use of concentrating solar collectors. In this paper, detailed optical design of the solar parabolic dish concentrator is presented. The parabolic dish of the solar system consists from 12 curvilinear trapezoidal reflective petals. This paper presents optical simulations of the parabolic solar concentrator unit using the ray-tracing software TracePro. The total flux on receiver and the distribution of irradiance for absorbed flux on center and periphery receiver are given. The total flux at the focal region is 4,031.3 W. The goal of this paper is to present optical design of a low-tech solar concentrator, that can be used as a potentially low-cost tool for laboratory-scale research on the medium-temperature thermal processes, cooling, industrial processes, solar cooking and polygeneration systems, etc.

关键词： Solar parabolic dish concentrator optical analysis solar energy solar radiation.

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In2O3:H for enabling highly NIR-transparent perovskite solar cells and 24.6% 4-T perovskite/CIS tandems

In2O3:H for enabling highly NIR-transparent perovskite solar...

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第八届新型太阳能材料科学与技术学术研讨会

作者： Yan Jiang Energy Materials and Optoelectronics Unit of Songshan Lake Materials Laboratory

High efficiency four-terminal(4-T) tandem solar cells rely on three transparent electrodes with high conductivity and low free carrier absorption in the near-infrared(NIR) region. In this work, a high-mobility In O:H(IO:H) film(129 cm V s) is prepared by independently controlling H and O gas flows during magnetron sputtering. When using the IO:H film as the front electrode in NIR transparent perovskite solar cell(PSC), a 17.3% steady-state power conversion efficiency and an 82% average transmittance between 820 and 1300 nm are achieved. In combination with an 18.1% CIS solar cell, a 24.6% perovskite/CIS tandem device in 4-T configuration is demonstrated. In addition, tunning H and O partial pressures decreases the crystallization temperature to 130 °C. optical analysis suggests that an amorphous IO:H film(without post annealing) and a partially crystallized IO:H film(post annealed at 150 °C), when used as a rear electrode in a NIR-transparent PSC and a front electrode in a CIS solar cell, respectively, can outperform the widely used indiumdoped zinc oxide(IZO) electrodes, leading to a 1.38 mA/cm short-circuit current(Jsc) gain in the bottom CIS cell of 4-T tandems.

关键词： hydrogenated indium oxide carrier mobility perovskite tandem solar cell optical analysis

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