Dye-Sentitised Solar Cells Essay Example | Topics and Well Written Essays - 2000 words

Dye-Sentitised Solar Cells - Essay Example ll (DSC), and their equivalence to process of photosynthesis5 6 Figure 2: Components of DSC11 10 Figure 3: common organic dyes with their conversion efficiency in DSC6 13 Figure 4: Molecular structures of Ruthenium based inorganic dye complexes18 14 Figure 5: Structure of Ru(II) NCS complex19 15 Figure 6 Photocurrent action spectra of bipyridine and Terpyridine dye along with photocurrent response of plain TiO2 films4 15 Figure 7: General structure of main betalain dyes extracted from red turnip and wild prickly pear. 1. Betacyanin, 2. Indicaxanthin. R1 and R2 = H (betanidin) or R1= ?-D-glucose and R2= H (betanin)14 17 Figure 8 Photoaction spectra of betalains from red turnip and wild prickly pear on transparent titania19 17 Figure 9: Photoaction spectra of Bchlorin 1 and Bchlorin 224 18 Figure 10: Iodide triodide redox couple25 19 Figure 11: Spirobifluorene4 20 Figure 12: Operation principle of DSC26 20 Figure 13 Current generation in DSC, step 1 21 Figure 14: Current generation in DSC, step 2 22 Figure 15: Current generation in DSC, Step 3, light absorption 22 Figure 16: Current generation in DSC, step 4 22 Figure 17: Current generation in DSC, step 5 23 Figure 18: Current generation in DSC, step 6 23 Figure 19 : Maximum voltage in DSC25 24 Figure 20: Kinetics of DSC operation. 25 Figure 21: A: Action spectra of Energy relay dye DCM alone and in combination with near IR sensitizing dye TT1; B: Molecular structure of DCM and TT128 27 Figure 22: porphyrin chromophore linked to dye29 27 Figure 23: Photocurrent density of TiO2 nanowires photoelectrode film as a function of measured potential (IPCE spectrum in inset)2 28 Figure 24: Absorptance spectrum (?) calculated from measured diffuse reflectance (Rd) and diffuse transmittance (Td) spectra of a cellulose template dye sensitized 6Â µm thick film of titania hollow fibers. APCE (absorbed photon to current conversion efficiency calculated from IPCE plot and ? plot 30 29 Figure 25: Hybrid nanosheets31 30 Figure 26 : Spectral response of photocurrent DSCs using T2/T- and I3-/I- as the electrolyte34 31 1.0 Introduction Energy is the basic need of all economies, whether developed or developing. For the past two centuries electricity requirements have been provided mostly by fossil fuels, which have two basic limitations: being non renewable and environmentally damaging . Considering the ever increasing demand of electricity that is expected to peak in coming years1 it has become imperative to explore alternative sources of energy which are not only renewable, but also eco-friendly. Of these, use of solar energy has been found to be practical and viable. The solar energy available to