Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5435420 | Synthetic Metals | 2017 | 7 Pages |
â¢TPCOs have been investigated as a major p-type layer of organic solar cells.â¢The highest PCE reached â¼3.0% with VOC of 1.0 V by a simple planar heterojunction.â¢The variation in the HOMO levels of TPCOs provides various VOC.
We investigated solar cells in which various thiophene/phenylene co-oligomers (TPCOs) were used as the major photoelectric-conversion component and obtained enhanced performance. These simple planar heterojunction solar cells consisted of TPCO as the p-type semiconductor and fullerenes as the n-type semiconductor. The variation in the highest occupied molecular orbital levels of the TPCOs caused systematic modulation of the open-circuit voltage (VOC) without incurring a large change in the short-circuit current. We obtained a maximum power-conversion efficiency (PCE) of 3.0%, with VOC reaching 1.0Â V. This PCE exceeds that obtained for a device containing zinc phthalocyanine, a conventional p-type photoelectric-conversion material.