The Effect of Cesium Carbonate Modified Layer on the Performance of Organic Solar Cells

Abstract

Experiments found that the thickness of the cesium carbonate modified layer of the processing solution will affect the performance of the polymer solar cells. We dissolved cesium carbonate in an organic solvent 2-ethoxyethanol, and prepared cesium carbonate modified layer of different thickness at different rotational speed. When the rotationing speed was at 2000 r/min, the efficiency of the device was preferably 2.28%, which indicated that the thickness prepared at this speed was most advantageous to the enhancement of the performance of the device. In addition, by annealing cesium carbonate modified layer at 130°C and 150°C, we found that the performance degradation of the annealing device at higher temperature was due to the fact that too much of the energy destroyed the micro-structure of the formed active layer.