Abstract
Abstract A solid-state dye-sensitized solar cell comprising dye mixtures of [Ru(2,2-bpy-4,4′-dicarboxylic acid)(NCS) 2 ] and [Ru(4,4′,4″-tricarboxy-2,2;6,2″-terpy)(NCS) 3 ] on TiO 2 thin film was fabricated. The different optical properties of dyes results in increased photocurrent and incident photon to photocurrent efficiency (IPCE). The multiple dye system showed the short circuit current ( I sc ) of 10.2 mA/cm 2 and a cell efficiency ( η ) of 2.8 while broadening the spectral sensitivity of the cell. When a single dye is used, I sc of 6 and 5 mA/cm 2 and cell efficiency of 1.7 and 1.2 were observed for [Ru(4,4-bis(carboxy)-bpy) 2 (NCS) 2 ] (dye 1) and [Ru(2,2′,2″-(COOH) 3 -terpy)(NCS) 3 ] (dye 2), respectively. Additionally, the resulting IPCE for the solar cell consisting of dye mixture was 50% at wide wavelength range from 530 to 650 nm while for the dye 1, 32% IPCE was observed at 535 nm while for the dye 2, highest IPCE value observed was 20% at 620 nm.
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