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首页> 外文期刊>Journal of Electronic Materials >Dye-Sensitized Solar Cells Employing Extracts from Four Cassia Flowers as Natural Sensitizers: Studies on Dye Ingredient Effect on Photovoltaic Performance
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Dye-Sensitized Solar Cells Employing Extracts from Four Cassia Flowers as Natural Sensitizers: Studies on Dye Ingredient Effect on Photovoltaic Performance

机译：染料敏化太阳能电池用来自四个陈草花的提取物作为天然敏感剂：研究染料成分对光伏性能的影响

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摘要

Natural dyes extracted from four different flowers, namely, Cassia surattensis, Cassia tora, Cassia alata and Cassia occidentalis were used as sensitizers for TiO2-based dye-sensitized solar cells (DSSC). The dye extracts from flowers were obtained by a simple extraction technique and used without any further purification. Optical characteristics of dye extracts were studied. Fourier-transform infrared (FTIR) spectra were used to identify the constituents of extracted dyes. The photovoltaic performance of DSSC employing dye-capped TiO2 photoanodes was measured. The sensitization performance related to anchoring groups present and interaction between dyes with TiO2 surface is demonstrated. An attempt has been made to rationalize the observations by light absorption of the dye extracts and their adsorption on TiO2. The short-circuit current density (I (SC)) values ranged from 0.06 mA/cm(2) to 0.20 mA/cm(2); open circuit voltage (V (OC)) from 0.292 V to 0.833 V; fill factor (FF) from 0.7 to 0.9; efficiencies (eta) from 0.013% to 0.15% and incident photon-to-current conversion efficiency from 13% to 20%, were obtained for DSSC using these natural dye extracts. Cassia occidentalis showed the highest current density of 0.20 mA/cm(2) and power conversion efficiency of 0.15%, which was due to better interaction between the carbonyl and hydroxyl group of the anthocyanin molecule of C. occidentalis and surface of TiO2 film. The red and blue shift of absorption wavelength of C. surattensis and the blue shift of absorption wavelength of the C. tora, C. alata and C. occidentalis extract in ethanol solution compared to that on TiO2 film has been used for the interpretation of obtained results.
机译：从四种不同的花朵中提取的天然染料，即Cassia Surattensis，Cassia Tora，Cassia Alta和Corcidentalis用作TiO2的染料敏化太阳能电池（DSSC）的敏化剂。来自花的染料萃取物通过简单的提取技术获得并使用而无需进一步纯化。研究了染料提取物的光学特性。傅里叶变换红外（FTIR）光谱用于鉴定提取的染料的成分。测量使用染料封端的TiO2光阳极的DSSC的光伏性能。证明了与锚定组相关的敏化性能和染料与TiO 2表面之间的相互作用。已经尝试通过光吸收染料提取物及其对TiO 2的吸附来合理化观察。短路电流密度（I（SC））值范围为0.06mA / cm（2）至0.20mA / cm（2）;开路电压（V（OC））从0.292 V至0.833 V;填充因子（FF）从0.7到0.9;使用这些天然染料提取物，获得从0.013％至0.15％的效率（ETA）从0.013％到0.15％，从13％到20％获得的入射光介质转化效率为DSSC。 Cassia Occidentalis显示出最高电流密度为0.20mA / cm（2），功率转化效率为0.15％，这是由于C. occidentalis和TiO 2膜的表面的羰基和羟基之间的更好的相互作用。与TiO 2膜上的乙醇溶液中C. surattensis的吸收波长的红色和蓝色移位和乙醇溶液中的吸收波长的蓝色偏移。与TiO 2薄膜相比，在乙醇溶液中用于解释获得的解释结果。

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