5,6-bis(octyloxy)benzo[c][1,2,5]thiadiazole-bridged dyes for dye-sensitized solar cells with high open-circuit voltage performance

摘要

Three new metal-free dyes with a 5,6-bis(octyloxy)benzo[c][1,2,5] thiadiazole core (DOBT-I-III) have been designed and synthesized for use as DSSCs. Their absorption properties and electrochemical and photovoltaic performances have been investigated systematically. The DSSCs based on DOBT-I-III show high open-circuit voltages (V_(oc)) of 829, 818, and 784 mV, respectively. Of the three dyes, DOBT-III, which contains a thiophene-bridging linker, exhibits the best photovoltaic performance: a short-circuit photocurrent density (J_(sc)) of 12.74 mA cm~(-2) and a fill factor (FF) of 0.73, which corresponds to an overall conversion efficiency of 7.29 % under standard global AM 1.5 solar conditions. Three new dyes with a 5,6-bis(octyloxy)benzo[c][1,2,5]thiadiazole core (DOBT-I-III) have been designed and synthesized for use as dye-sensitized solar cells (DSSCs). DOBT-I-III show high open-circuit voltages (0.78-0.83 V) with the DSSCs based on DOBT-III, which contains a thiophene-bridging linker, exhibiting the best photovoltaic performance with a power conversion efficiency of up to 7.29 %.