Abstract
In recent years the harvesting of renewable energies became of great importance. This led to a rapid development of dye-sensitized solar cells which can be produced from low-purity materials. The best electrical properties are provided by cells prepared using synthetical, ruthenium based dyes. Unfortunately, most of them are toxic and expensive. The anthocyanins extracted for example from hibiscus flowers yield a more cost-effective and eco-friendly alternative to toxic dyes, however, with a loss of solar cell efficiency. In this article the possibility of improvement of the conversion efficiency by modification of the pH value of the dye is investigated. By decrease of the pH value, an increase of efficiency by a factor of two was achieved.
Highlights
In recent years, conventional textiles and electronic components have been integrated to produce novel fashion effects, visual displays, or audio and computing systems
The short-circuit current density and the maximal power of cells with a graphite layer made by a pencil are higher by 17.3% and 28.8% for pH = 1.1 and by 7.7% and 13.3% for pH = 2.0, respectively
The current density depends much stronger on the pH value of the dye than the open-circuit voltage
Summary
Conventional textiles and electronic components have been integrated to produce novel fashion effects, visual displays, or audio and computing systems. In some regions of Asia and Africa the electricity supply of the off-grid low income population is solved by installation of community and home charging stations [4] Because of their cost effective production, textile based DSSCs may be used for this purpose. An electron is injected from this excited state into the semiconductor conduction band and transported through the TiO2 layer to an external load and further to the counter electrode. It recombines with acceptors in the electrolyte, which finishes the circuit by reducing the dye cation to its neutral ground state [2,5,6,7]. Rudhziah et al developed biopolymeric electrolytes based on the blend
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