| Autor: |
Li, Miao, Zhou, Yuanyuan, Yang, Lisi, Shen, Shuaishuai, Liu, Yahui, Chen, Yanan, Song, Jinsheng, Bo, Zhishan |
| Zdroj: |
Journal of Materials Chemistry A; 11/14/2020, Vol. 8 Issue 42, p22416-22422, 7p |
| Abstrakt: |
Molecular orientation is one of the key parameters that would greatly influence the charge transportation in sandwich-type organic photovoltaic devices. Herein, two new A–π–D–π–A type acceptor molecules Ph-DTDPo-OTE and Ph-DTDPo-TE are designed and synthesized based on a 2H-pyran derived ladder-type dipyran core (DTDPo). A branched 2-ethylhexyloxy chain is utilized to replace the linear hexyloxy one so as to improve the solubility and blend morphology. It's interesting that the dominant edge-on orientation for Ph-DTDPo-OTE could be converted to the favorite face-on packing when the alkyloxy chains are replaced by alkyl ones. The desired molecular orientations of both Ph-DTDPo-TE and PBDB-T could guarantee the efficient charge transportation. In addition, good miscibility and interpenetrated fibrils have been observed in the blend of Ph-DTDPo-TE:PBDB-T by both surficial and in-depth morphology characterization experiments. Finally, a high PCE of 12.21% (Voc = 0.82 V, Jsc = 20.83 mA cm−2 and FF = 71.14%) is achieved for Ph-DTDPo-TE , which is one of the highest values for binary OSCs based on a pyran comprising acceptor. Our research demonstrates that appropriate side chain engineering at the π-bridge is an effective strategy to regulate molecular orientations and the morphology of blend films. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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