Green grasses as light harvesters in dye sensitized solar cells

Efficiency enhancement of natural dye sensitized solar cell by optimizing electrode fabrication parameters

“…Basically, DSSC is comprised of a transparent conducting glass electrode with a porous layer of semiconductor (e.g. TiO 2 ) coated with a dye (which can be organic, inorganic or hybrid), an electrolyte layer containing the iodine/triiodine (I − /I − 3 ) redox couple, and a counter electrode typically coated with graphite or platinum [13][14][15][16][17]. Dye sensitized solar cells (DSSCs) function by sensitizing nano-particulate photoanode (DSSC's anode, i.e.…”

Fe–tannic acid complex dye as photo sensitizer for different morphological ZnO based DSSCs

“…TheNyquist plot which has the smaller semicircles at the high frequency is corresponding to the resistance (R ct1 ) at the counter electrode, (Pt)/electrolyte interfaces and the big semicircles at low frequency is related to the charge transfer resistance (R ct2 )of ZnO/dye/electrolyte interface[2,[30][31][32]. The R s is a serial resistance of FTO substrate.…”

“…The R s is a serial resistance of FTO substrate. The semicircles at low frequency (big semicircles) are associated with the Warburg diffusion of the redox couple (I 3 -/I -) in the electrolyte[31]. The electrochemical impedance value of the ZnO nanostructure based on solar cell summarized inTable 5.…”

Investigation of Vegetable Tannins and Their Iron Complex Dyes for Dye Sensitized Solar Cell Applications

“…The Nyquist plots have two semicircles, the smaller observed at high frequency region corresponds to the charge transfer resistance of counter electrode (FTO-Pt) and electrolyte ( --3 I / I ) interfaces (R CT1 ). The other semicircle at low frequency region is related to the charge transfer resistance between photoanode, dye and electrolyte interface (ZnO/tannin/ --3 I / I ) (R CT2 ) [4,52,53].This large semicircle conforms to Warburg diffusion models [52]. The R s corresponds to serial resistance of FTO surface.…”

“…Although mimosa and Fe-mimosa based cell demonstrated long electron lifetimes, UV-Vis spectra indicated feeble peaks, which led to a lowlight harvesting compared with valonea and chestnut. All solar cell systems can take advantage of the low resistance and prolonged electron lifetime [53]. The Fe-valonea and Fe-chestnut based solar cells show more favorable electron injection and charge recombination, leading to more effective electron capture, which is partly responsible for photocurrent enhancement and the improved solar cell efficiency [16,52].…”