Anthocyanins and betalains as light-harvesting pigments for dye-sensitized solar cells

We present the photoelectrochemical properties of dye-sensitized solar cells using natural pigments containing betalains and anthocyanins as sensitizers. The dyes extracted from grape, mulberry, blackberry, red Sicilian orange, Sicilian prickly pear, eggplant and radicchio have shown a monochromatic incident photon to current efficiency (IPCE) ranging from 40% to 69%. Short circuit photocurrent densities (Jsc) up to 8.8 mA/cm2, and open circuit voltage (Voc) ranging from 316 to 419 mV, were obtained from these natural dyes under 100 mW/cm2 (AM 1.5) simulated sunlight. The best solar conversion efficiency of 2.06% was achieved with Sicilian prickly pear fruits extract. The influence of pH and co-absorbers on natural sensitizers, were investigated and discussed.

Several natural dyes are studied as possible sensitizers for dye-sensitized solar cells we explore how it is possible optimize the performance of these environmentally friendly dyes reaching conversion efficiency of 2% and IPCE up to 69%.Figure optionsDownload as PowerPoint slideHighlights
► We studied anthocyanins and betalains extracts as sensitizers for DSSCs application.
► The conversion efficiency of our best device based on Sicilian prickly pear is 2.06%.
► The Voc, Jsc and FF of our best device are 0.389 V, 8.8 mA/cm2 and 60.0%, respectively.
► IPCE up to 69% for multilayer structure of photoanode natural dye based was achieved.
► Effects of pH, additives and co-absorbers on natural sensitizers were studied.