Quantification of the Effects of Recombination and Injection in the Performance of Dye-Sensitized Solar Cells Based on N-Substituted Carbazole Dyes

摘要: Two new sensitizers for dye sensitized solar cells have been designed consisting of thiophene units asymmetrically functionalized by N-aryl carbazole. The di(tert-butyl) carbazole moieties acts as an electron donor group, the chain a bridge and cyanoacrylic acid anchoring acceptor group. An increase conjugation length produces two main effects: first, it leads to red-shift optical absorption dyes, resulting in improved overlap with spectrum. Second, oxidation potential decreases. photovoltaic performance this set dyes mesoporous TiO2 was investigated using electrolytes containing iodide/triiodide redox couple. best characteristics showed highest photocurrent but lower open circuit voltage due more losses recombination. A trend between structure (molecule size) recombination is demostrated analysis procedure ...