Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/65433
Title: New terthiophene-conjugated porphyrin donors for highly efficient organic solar cells
Authors: Xiao, L
Chen, S
Gao, K
Peng, X
Liu, F
Cao, Y
Wong, WY 
Wong, WK
Zhu, X
Keywords: Molecular packing
Organic solar cells
Peripheral substitutions
Porphyrin
Terthiophene
Issue Date: 2016
Publisher: American Chemical Society
Source: ACS applied materials and interfaces, 2016, v. 8, no. 44, p. 30176-30183 How to cite?
Journal: ACS applied materials and interfaces 
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 ?-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.
URI: http://hdl.handle.net/10397/65433
ISSN: 1944-8244
EISSN: 1944-8252
DOI: 10.1021/acsami.6b09790
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