Enhancement of polymer solar cell performance using spin-coated reflector structure

We have prepared polymer solar cells with improved performance by inserting a simple reflector layer prepared by spin-coating. The reflector consists of TiOx and SiOx layers inserted between glass substrate and indium tin oxide electrode. All the processing is performed at temperatures not exceeding 150 °C. The transmittance of the structure can be adjusted by changing the spinning speed and the number of layers used. The use of a reflector structure results in a significant increase in the short circuit current density, on average from 7.6 mA cm−2 to 8.9 mA cm−2.