| 초록 |
The attractive feature of hybrid organic tandem solar cells is that the active material can be selected from a number of candidate materials including various polymers and small molecules, thus making it easy to construct a subcell combination with complementary absorption. However, in the hybrid tandem device reported so far, there is a structural limitation that the small molecule layers must be located on the polymer active layer due to the dissolution problem caused by the organic solvent in the process of forming the polymer thin film. We demonstrate a hybrid organic tandem solar cell comprising a polymer top subcell and a small molecule bottom subcell using a thin-film transfer technique. The hybrid tandem solar cell has a VOC of 1.46 V, which is almost equal to the sum of the VOC's of single-junction cells. Also, the PCE of tandem device is 6.26%, which is, to the best of our knowledge, the highest among small molecule-polymer hybrid tandem solar cells demonstrated so far. |
