Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 44, Pages 30176-30183Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09790
Keywords
porphyrin; organic solar cells; terthiophene; peripheral substitutions; molecular packing
Funding
- International Science & Technology Cooperation Program of China [2013DFG52740, 2010DFAS2150]
- National Natural Science Foundation of China [51473053, 51073060, 91222201, 91333206]
- Hong Kong Research Grants Council [HKBU 22304115-ECS, HKBU 203011]
- Hong Kong Baptist University [FRG1/14-15/058, FRG2/13-14/083, RC-ICRS/15-16/02]
- Areas of Excellence Scheme [AoE/P-03/08]
- Hong Kong Polytechnic University
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0001087]
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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 pi-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-C-71-butyric acid methyl ester (PC71BM) characteristics of bicontinuous, interpenetrating networks required for efficient charge separation and transportation.
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