Sinha D, De D, Ayaz A
Department of Electrical Engineering, Dr. B C Roy Engineering College, Durgapur, India.
Department of Applied Electronics and Instrumentation Engineering, Dr. B C Roy Engineering College, Durgapur, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Mar 15;193:467-474. doi: 10.1016/j.saa.2017.12.058. Epub 2017 Dec 26.
Environmental friendly natural dye curcumin extracted from low-cost Curcumina longa stem is used as a photo-sensitizer for the fabrication of ZnO-based dye-sensitized solar cells (DSSC). Nanostructured ZnO is fabricated on a transparent conducting glass (TCO), using a cost-effective chemical bath deposition technique. Scanning electron microscopic images show hexagonal patterned ZnO nano-towers decorated with several nanosteps. The average length of ZnO nano-tower is 5μm and diameter is 1.2μm. The UV-Vis spectroscopic study of the curcumin dye is used to understand the light absorption behavior as well as band gap energy of the extracted natural dye. The dye shows wider absorption band-groups over 350-470nm and 500-600nm with two peaks positioned at 425nm and 525nm. The optical band gap energy and energy band position of the dye is derived which supports its stability and high electron affinity that makes it suitable for light harvesting and effortless electron transfer from dye to the semiconductor or interface between them. FTIR spectrum of curcumin dye-sensitized ZnO-based DSSC shows the presence of anchoring groups and colouring constitutes. The I-V and P-V curves of the fabricated DSSC are measured under simulated light (100mW/cm). The highest visible light to electric conversion efficiency of 0.266% (using ITO) and 0.33% (using FTO) is achieved from the curcumin dye-sensitized cell.
从低成本的姜黄茎中提取的环保型天然染料姜黄素被用作制备基于氧化锌的染料敏化太阳能电池（DSSC）的光敏剂。采用具有成本效益的化学浴沉积技术在透明导电玻璃（TCO）上制备了纳米结构的氧化锌。扫描电子显微镜图像显示，六边形图案的氧化锌纳米塔上装饰着几个纳米台阶。氧化锌纳米塔的平均长度为5μm，直径为1.2μm。对姜黄素染料进行紫外-可见光谱研究，以了解提取的天然染料的光吸收行为以及带隙能量。该染料在350-470nm和500-600nm范围内显示出较宽的吸收带组，有两个峰值分别位于425nm和525nm处。推导了该染料的光学带隙能量和能带位置，这支持了其稳定性和高电子亲和力，使其适合于光捕获以及染料到半导体或它们之间界面的轻松电子转移。姜黄素染料敏化的基于氧化锌的DSSC的傅里叶变换红外光谱显示了锚定基团和显色成分的存在。在模拟光（100mW/cm）下测量了制备的DSSC的I-V和P-V曲线。姜黄素染料敏化电池实现了最高0.266%（使用ITO）和0.33%（使用FTO）的可见光到电的转换效率。
