Aggregation control of organic sensitizers for panchromatic dye co-sensitized solar cells

作者：Lee Chi Hwan^*; Kim Sang A; Jung Mi Ran; Ahn Kwang Soon; Han Yoon Soo; Kim Jae Hong

来源：Japanese Journal of Applied Physics, 2014, 53(8): 08NC04.

DOI：10.7567/JJAP.53.08NC04

The photovoltaic properties of dye co-sensitized solar cells were compared with those of mono-sensitized devices. Co-sensitized TiO2 photoelectrodes were prepared from a phenothiazine chromophore for the RED dye and a squaraine chromophore for the BLUE dye to achieve panchromatic light absorption in dye co-sensitized solar cells (DSSCs). Co-sensitization on the TiO2 photo-electrode could reduce the aggregation of the BLUE dye adsorbed on the TiO2 surface, which led to an enhancement of the short circuit current (J(SC)) of the co-sensitized solar cells. The dye co-sensitized solar cells with the RED and BLUE dyes optimized according to the dipping time showed an increase in the photon-to-current efficiency compared to that of the solar cell with a mono-sensitized photo-electrode. The photovoltaic and aggregation properties of the DSSCs were examined by measuring the current-voltage curve, incident photon-to-current efficiency, and electrochemical impedance spectra.

• 出版日期2014-8