Design of high-efficiency solid-state dye-sensitized solar cells using coupled dye mixtures

摘要

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 TiO2 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 (eta) of 2.8 while broadening the spectral sensitivity of the cell. When a single dye is used, I-sc of 6 and 5mA/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. (c) 2005 Elsevier B.V. All rights reserved.