The Application Of Polypyrrole And Its Composite On The Dye-sensitized Solar Cell

As a new type of solar cells，dye-sensitized solar cell (DSSC) has been one ofthe hot-spots due to its low cost, high efficiency, environment-friendly and simplefabrication process. The research of dye-sensitized solar cells is an important field inthe preparation of cheap solar cells, and the research results are meaningful in thefields of photo electro chemistry, semiconductor optic electronics, organic electrolyteand nanoporous materials. The research in dye-sensitized solar cell based on theconducting polymers counter electrode was carried out in this paper to reduce the costand improve the performance of device. There are some major works and results asfollows.1. With the aid of cetyl trimethyl ammonium bromide（CTAB）and methylorange(MO) template, nanosphere polypyrrole (PPy) and nanorod polypyrrole (PPy)based counter electrodes were prepared by chemical bath deposition, whichsimplified the traditional preparation(blade coating after polymerization) of polymerscounter electrode; Compared with traditional polypyrrole counter electrode, thenanosphere polypyrrole (PPy) counter electrode and nanorod polypyrrole (PPy)counter electrode show obviously enhanced electrochemical catalytic activity; TheDSSC based on the nanosphere PPy counter electrode was fabricated, and thephotoelectric conversion efficiency was4.45%; The DSSC based on nanorod PPycounter electrode reached a higher efficiency of5.00%.2. A low amounts of platinum composite counter electrode of PPy/Pt with highconductivity and excellent electrochemical catalytic activity was prepared by electrodeposited Pt onto the surface of nanorod PPy. Due to the high specific area of PPyand excellent catalytic activity of Pt, the PPy/Pt counter electrode shows higherelectrical conductivity and excellent catalytic activity. The DSSC based on the PPy/Ptnanorod structure was also fabricated, and enhanced light-to-current conversionefficiency of7.08%was achieved.3. The transition metal sulfide (CoS) was successfully located on the PPy nanorods based counter electrode by electro deposition. Electrochemical test indicatesthat when the CoS thickness reaches100nm, the PPy/CoS composite counterelectrode shows the highest excellent catalytic activity, even higher than Ptcounterpart. A high power conversion efficiency of DSSC based on the PPy/CoScounter electrode about7.52%under a simulated solar illumination of100mW cm–2was achieved.