2D‐Π‐A Type Organic Dyes Based on N,N‐Dimethylaryl Amine and Rhodamine‐3‐acetic Acid for Dye‐sensitized Solar Cells

Abstract

AbstractThree organic dyes XS17–19 based on N,N‐dimethylaryl amine and rhodamine‐3‐acetic acid moieties are designed and synthesized. These dyes were applied into nanocrystalline TiO2 dye‐sensitized solar cells through standard operations, showing strong absorption bands at around 320–650 nm, and exhibiting broad IPCE responses. Cell based on XS17 gave a Jsc of 3.7 mA/cm2, an open circuit voltage of 550 mV, and a fill factor of 0.68, corresponding to an overall conversion efficiency of 1.4%. The low overall conversion efficiency is due to the modest IPCE and Voc values, which mainly stem from the acceptor of rhodanine‐3‐acetic acid.