ABSTRACT The aim of this investigation is to study the UV/Visible absorption and infra-red transmission characteristics due to Cu+/Cu2+ redox in silica glass. The glass composition 18Na2O-2MgO-8CaO-72SiO2 (mol%) containing different concentrations of CuO were prepared by melting route. The optical absorption spectra of the glasses were recorded on an UV/Visible/NIR spectrophotometer in the wavelength range of 200-1100 nm. The linear absorption coefficient was found to be around 7.60 cm–1 per wt% of CuO in the glass samples. The Cu2+ band was attributed to spin allowed transition from 2Eg →2T2g level in the glass and the applicability of Urbach’s rule was tested for Cu+ ion. It was found that optical band gap for Cu+ was 4.03 eV and its band width was 0.43 eV in the glass. The oscillator strength of the Cu+ ion band (ƒabs) in the glass was reported. The absorption and transmission characteristics of glass containing Cu+ and Cu2+ ions showed a decrease in absorption coefficient of Cu2+ beyond red spectral region. This dictates that glass containing copper ions can be used for IR transmitting purpose and can convert the solar energy into electrical energy for photovoltaic applications. GRAPHICAL ABSTRACT

中文翻译：

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太阳能用钠镁石灰硅玻璃中Cu2+离子的紫外/可见光吸收和红外透射特性研究

摘要 本研究的目的是研究石英玻璃中 Cu+/Cu2+ 氧化还原引起的紫外/可见光吸收和红外传输特性。采用熔融法制备了含有不同浓度CuO的玻璃组合物18Na2O-2MgO-8CaO-72SiO2(mol%)。在紫外/可见光/近红外分光光度计上记录玻璃的光吸收光谱，波长范围为 200-1100 nm。发现玻璃样品中每重量％的 CuO 的线性吸收系数约为 7.60 cm-1。Cu2+ 带归因于自旋允许从玻璃中的 2Eg →2T2g 水平转变，并且测试了 Urbach 规则对 Cu+ 离子的适用性。发现 Cu+ 的光学带隙为 4.03 eV，其带宽在玻璃中为 0.43 eV。报告了玻璃中 Cu+ 离子带 (ƒabs) 的振子强度。含有 Cu+ 和 Cu2+ 离子的玻璃的吸收和透射特性表明，Cu2+ 的吸收系数在红色光谱区之外有所下降。这表明含有铜离子的玻璃可用于红外传输目的，并可将太阳能转化为电能用于光伏应用。图形概要