Yaman Muammer Y, Han Ahmet Selim, Bandara Jayasundera, Karakaya Cüneyt, Dag Ömer
Department of Chemistry and UNAM-National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey.
National Institute of Fundamental Studies, Hantana Road, Kandy, Central Province 20000, Sri Lanka.
ACS Omega. 2017 Aug 28;2(8):4982-4990. doi: 10.1021/acsomega.7b00839. eCollection 2017 Aug 31.
Sensitizing titania with semiconducting quantum dots (QDs) is an important field for the development of third-generation photovoltaics. Many methods have been developed to effectively incorporate QDs over the surface of mesoporous titania, assembled from the 20-25 nm titania nanoparticles. Here, we introduce a molten-salt-assisted self-assembly (MASA) method to fabricate CdSe-modified mesoporous titania photoanodes. A mixture of ethanol, two surfactants (cetyltrimethylammonium bromide and 10-lauryl ether), silica (tetramethyl orthosilicate) or titania source (Ti(OCH), acid (HNO), and cadmium nitrate solution was infiltrated into the pores of mesoporous titania (assembled using Degussa 25, P25) and immediately calcined at 450 °C to obtain mesoporous cadmium oxide-silica-titania (meso-CdO-SiO-P25) or cadmium titanate-titania (meso-CdTiO-P25) films. The MASA process is a simple method to smoothly coat or fill the pores of titania with mesoporous CdO-SiO or CdTiO that can be reacted under an HSe atmosphere to convert cadmium species to CdSe at 100 °C. Etching of the silica films with a very dilute hydrogen fluoride solution produces mesoporous CdSe-titania (meso-CdSe-P25) electrodes. The method is flexible to adjust the CdSe/TiO mole ratio over a very broad range in the films. The films were characterized at every stage of the preparation to demonstrate the effectiveness of the method. The electrodes were also tested in a simple two-electrode solar cell to demonstrate the performance of the electrodes that have a power conversion efficiency of 3.35%.
用半导体量子点（QDs）敏化二氧化钛是第三代光伏技术发展的一个重要领域。人们已经开发出许多方法来有效地将量子点整合到由20 - 25纳米二氧化钛纳米颗粒组装而成的介孔二氧化钛表面。在此，我们介绍一种熔盐辅助自组装（MASA）方法来制备CdSe修饰的介孔二氧化钛光阳极。将乙醇、两种表面活性剂（十六烷基三甲基溴化铵和10 - 月桂基醚）、二氧化硅（原硅酸四甲酯）或二氧化钛源（Ti(OCH)、酸（HNO）和硝酸镉溶液的混合物渗透到介孔二氧化钛（使用德固赛25，P25组装）的孔中，并立即在450°C下煅烧，以获得介孔氧化镉 - 二氧化硅 - 二氧化钛（介孔 - CdO - SiO - P25）或钛酸镉 - 二氧化钛（介孔 - CdTiO - P25）薄膜。MASA工艺是一种简单的方法，可以用介孔CdO - SiO或CdTiO顺利地包覆或填充二氧化钛的孔，这些物质在HSe气氛下于100°C反应可将镉物种转化为CdSe。用非常稀的氢氟酸溶液蚀刻二氧化硅薄膜可得到介孔CdSe - 二氧化钛（介孔 - CdSe - P25）电极。该方法能够在很宽的范围内灵活调整薄膜中CdSe/TiO的摩尔比。在制备的每个阶段对薄膜进行表征，以证明该方法的有效性。还在一个简单的两电极太阳能电池中对电极进行了测试，以证明电极的性能，其功率转换效率为3.35%。
