Leaf Dye Sensitized Solar Cells

A dye sensitized solar cell made by coating pigments in an extract from shiso leaves on a nanocrystalline film of tio 2 and subsequent deposition of p cui is found to have an energy conversion efficiency of 1 3.

Leaf dye sensitized solar cells.

Modern dye sensitized solar cells or grätzel cells are based on a concept invented in 1988 by brian o regan and michael grätzel but the concept dates back to the 1960s and 70s. The organic dye monolayer in the photoelectrochemical or dye sensitized solar cell replaces light absorbing pigments chlorophylls the wide bandgap nanostructured semiconductor layer replaces oxidized dihydro nicotinamide adenine dinucleotide phosphate nadph and carbon dioxide acts as the electron acceptor. Both thermal and plasmaassisted ald approaches have been successfully adopted to fabricate dielectric and semiconductor ultra thin films and metal nanoparticles on different substrates. Dye sensitized solar cells dssc are an efficient type of thin film photovoltaic cell.

However whilst in photosynthesis the solar energy is captured as chemical energy in bio molecules electricity is the product for dscs making this an example of photovoltaic pv technology. The application of ald to the latest generation of solar cells such as dye sensitized and perovskite has been addressed here. Dye sensitized solar cells dsscs based on extracted natural dyes 1. Dye sensitized solar cells dscs can be described as a form of artificial photosynthesis because light is captured in a similar manner by a chromophore.

It is based on a semiconductor formed between a photo sensitized anode and an electrolyte a photoelectrochemical system. Although grätzel began his research well before nanotechnology had the buzz that it does today the mesoscopic thin films he has developed have paved the way for generations of scientists to exploit the. Onion peels red cabbage and spinach leaves used in this study were collected from fayoum city egypt. Solar energy materials and solar cells 2006 90 18 19 3187 3192.

Both shisonin and chlorophyll contribute to light energy harvesting as seen from the photocurrent action spectrum of the cell. Over the last years various types of solar cells have been developed to convert sunlight to. A dye sensitized solar cell dssc dsc dysc or grätzel cell is a low cost solar cell belonging to the group of thin film solar cells.