Abstract
Organic thin film solar cells show generally lower power conversion efficiencies than those of the solar cells based on inorganic active materials. To solve the problem diverse research works have been tried: development of new organic semiconductors; modification of internal structure of active layers by means of organic solvent; design and fabrication of vertical device structure; introduction of buffer layer on the side of cathode electrode. Nevertheless, the buffer layer on the side of anode has not been fully optimized. This study is focused on the representative anode-side-buffer layer of Poly(3,4-ethylenedioxythiophene)(PEDOT): poly(styrenesulfonate) (PSS). PEDOT:PSS is an excellent conducting polymer material with favorably high optical transparency for almost entire range of visible wavelength, which is widely used for organic thin film solar cells as well as for other organic material based electronic devices such as organic light emitting diodes. Aiming for further performance enhancement of organic thin film solar cell device, an optimized condition was studied on the PEDOT:PSS by means of the thickness control and modification of the internal structure via addition of different organic solvents in mixture solution for thin film process.
Highlights
Today the exhaustion of energy sources is the most critical issue for modern civilization, which is mainly due to drastic decrease of the remaining fossil fuel based energy resources by continuous and increasing utilization for the conventional electric power generation system
It can be thought that PEDOT:PSS could work as effective hole transfer layer, and distinctively improved power conversion efficiency (PCE) of the organic thin film solar cell devices are due to the increase of Jsc and fill factor (FF) contributed by the effect of PEDOT:PSS
Varieties of PEDOT:PSS layers were prepared by spin coating technique, where thickness of the PEDOT:PSS layers were varied and different precursor solution mixtures of the PEDOT:PSS were used with an additive of ethylene glycol (EG) or dimethyl sulfoxide (DMSO)
Summary
Today the exhaustion of energy sources is the most critical issue for modern civilization, which is mainly due to drastic decrease of the remaining fossil fuel based energy resources by continuous and increasing utilization for the conventional electric power generation system. Environment pollution is another severe problem contributed by carbon dioxide emission from the thermoelectric power generation and radioactive wastes from the nuclear power generation. Focused on these problems of environment and being exhausted energy resources, an environment-friendly generation technology of electricity has been developed since decades, and solar-energy based solar cells have attracted much attention. Topics of almost all the solar cell researches are nowadays focused on the low-cost generation of electric power
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