Abstract
To mimic the natural photosynthetic systems utilizing chlorophylls to absorb light and store light energy, two new porphyrin-based small molecules of PTTR and PTTCNR have been developed for photovoltaic applications. The highest power conversion efficiency of 8.21% is achieved, corresponding to a short-circuit current of 14.30 mA cm-2, open-circuit voltage of 0.82 V, and fill factor of 70.01%. The excellent device performances can be ascribed to the engineering of molecule structure and film morphology. The horizontal conjugation of 3,3″-dihexyl-terthiophene to porphyrin-core with the vertical aliphatic 2-octylundecyl peripheral substitutions, can not only effectively increase the solar flux coverage between the conventional Soret and Q bands of porphyrin unit, but also optimize molecular packing through polymorphism associated with side-chains and the linear π-conjugated backbones. And the additive of 1,8-diiodooctane and subsequent chloroform solvent vapor annealing facilitate the formation of the blend films with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) characteristics of bicontinuous, interpenetrating networks required for efficient charge separation and transportation.
Original language | English |
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Pages (from-to) | 30176-30183 |
Number of pages | 8 |
Journal | ACS Applied Materials and Interfaces |
Volume | 8 |
Issue number | 44 |
Early online date | 25 Oct 2016 |
DOIs | |
Publication status | Published - 9 Nov 2016 |
Scopus Subject Areas
- Materials Science(all)
User-Defined Keywords
- molecular packing
- organic solar cells
- peripheral substitutions
- porphyrin
- terthiophene