Incorporating Multiple Energy Relay Dyes in Liquid Dye-Sensitized Solar Cells

Panchromatic response is essential to increase the light‐harvesting efficiency in solar conversion systems. Herein we show increased light harvesting from using multiple energy relay dyes inside dye‐sensitized solar cells. Additional photoresponse from 400–590 nm matching the optical window of the zinc phthalocyanine sensitizer was observed due to Förster resonance energy transfer (FRET) from the two energy relay dyes to the sensitizing dye. The complementary absorption spectra of the energy relay dyes and high excitation transfer efficiencies result in a 35 % increase in photovoltaic performance. All the colours of the rainbow: Panchromatic response is essential to increase the light harvesting efficiency in solar conversion systems. The authors incorporate multiple energy relay dyes to gain a panchromatic response in dye‐sensitized solar cells (see graphic). The complementary absorption spectrum due to Förster resonance energy transfer increases the photovoltaic performance by 35 %.