title: Visible light absorption and photo-sensitizing properties of spinach leaves and beetroot extracted natural dyes.
abstract: Herein, chlorophyll and betalain dyes are extracted from fresh spinach leaves and beetroots. Fourier transform infrared spectra are used to identify the characteristic peaks of the extracted dyes. UV-vis light absorption characteristics of the dyes and their mixed counterpart are investigated by varying their pH and temperature. These dyes are used as photo sensitizer for fabrication of zinc oxide photo-anode based dye sensitized solar cells (DSSCs). The photo-voltaic characteristics of the developed DSSCs are measured under simulated solar light (power of incident light 100 mW cm(-2) from Air Mass 1.5G). The solar to electric conversion efficiencies for the chlorophyll, betalain and mixed dye based solar cells are estimated as 0.148%, 0.197% and 0.294% respectively. The highest conversion efficiency for mixed dye based solar cell is attributed due to the absorption of wider range of solar spectrum.
authors: Centre for Advanced Materials Processing, CSIR-Central Mechanical Engineering Research Institute, Durgapur 713209, W.B., India; Academy of Scientific and Innovative Research, CSIR-Central Mechanical Engineering Research Institute, Durgapur 713209, W.B., India.
authors: D
authors: D
authors: Sengupta
authors: Centre for Advanced Materials Processing, CSIR-Central Mechanical Engineering Research Institute, Durgapur 713209, W.B., India.
authors: B
authors: B
authors: Mondal
authors: Centre for Advanced Materials Processing, CSIR-Central Mechanical Engineering Research Institute, Durgapur 713209, W.B., India. Electronic address: kalisadhanm@yahoo.com.
authors: K
authors: K
authors: Mukherjee
mesh_terms: D027461:Beta vulgaris / Q000737:chemistry*; D050858:Betalains / Q000737:chemistry* / Q000302:isolation & purification; D002734:Chlorophyll / Q000737:chemistry* / Q000302:isolation & purification; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification; D011211:Electric Power Supplies; D004560:Electricity; D004566:Electrodes; D008027:Light; D017319:Photosensitizing Agents / Q000737:chemistry* / Q000302:isolation & purification; D018515:Plant Leaves / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D012993:Solar Energy; D013056:Spectrophotometry, Ultraviolet; D018724:Spinacia oleracea / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: D004396:Coloring Agents; D017319:Photosensitizing Agents; D002734:Chlorophyll; D050858:Betalains; D015034:Zinc Oxide
keywords: Dye sensitized solar cell; Natural dye; UV–vis spectroscopy; Zinc oxide