藤井 俊治郎

The push coating technique was used to fabricate a bulk heterojunction organic solar cell based on poly[[4,8-bis[(2-ethylhexyl)oxy]benzo [1,2-b:4,5-b0] dithiophene-2,6-diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-b]-thiophenediyl] (PTB7) and[6,6]-phenyl C71 butyric acid methyl ester (PC71BM). A 1,2-dichlorobenzene solution of PTB7:PC71BM was dropped on a poly(3,4-ethylenedioxythiophene):poly(styrenesulphonate) surface, which was push-coated using a polydimethylsiloxane stamp withdimensions 3 £ 19 mm2. The entire surface under the stamp was covered with only2 mL of the solution. The thickness of the active layer ranged between 25 and 55 nm when a 0200 g weight was placed on the stamp. The push-coated solar cell gaveacceptable performance. The short-circuit current density (8.05 mA/cm2), open circuitvoltage (0.8 V), fill factor (0.41), and power conversion efficiency (2.65%) indicatethat the push coating technique is a suitable solar cell fabrication process that minimises the loss of organic materials.