32281-36-0Relevant articles and documents
"roller-Wheel"-Type Pt-Containing Small Molecules and the Impact of "rollers" on Material Crystallinity, Electronic Properties, and Solar Cell Performance
He, Wenhan,Livshits, Maksim Y.,Dickie, Diane A.,Zhang, Zhen,Mejiaortega, Luis E.,Rack, Jeffrey J.,Wu, Qin,Qin, Yang
, p. 14109 - 14119 (2017)
We report the synthesis, characterization, and detailed comparison of a series of novel Pt-bisacetylide containing conjugated small molecules possessing an unconventional "roller-wheel" shaped structure that is distinctly different from the "dumbbell" designs in traditional Pt-bisacetylide containing conjugated polymers and small molecules. The relationships between the chemical nature and length of the "rollers" and the electronic and physical properties of the materials are carefully studied by steady-state spectroscopy, cyclic voltammetry, differential scanning calorimetry, single-crystal X-ray diffraction, transient absorption spectroscopy, theoretical calculation, and device application. It was revealed that if the roller are long enough, these molecules can "slip-stack" in the solid state, leading to high crystallinity and charge mobility. Organic solar cells were fabricated and showed power conversion efficiencies up to 5.9%, out-performing all existing Pt-containing materials. The device performance was also found to be sensitive to optimization conditions and blend morphologies, which are a result of the intricate interplay among materials crystallinity, phase separation, and the relative positions of the lowest singlet and triplet excited states.
Effect of fluorine on optoelectronic properties in DI-A-DII-A-DI type organic molecules: A combined experimental and DFT study
Appalanaidu, Ejjurothu,Busireddy, Manohar Reddy,Chetti, Prabhakar,Vaidya, Jayathirtha Rao,Vidya, V. M.
, (2020/03/17)
The impact of the substitution of fluorine atom/atoms on the optoelectronic features of organic molecules having DI-A-DII-A-DI type architecture is examined in the current work. The three synthesized organic molecules (SMD1, SMD2 and SMD3) comprise of a dithienopyrrole (DTP) derivative as a central donor (DII), which is flanked between two benzothiadiazole (BT) moieties (electron acceptors, A). The BT core on each of two ends is joined to an electron-donating benzodithiophene (BDT) derivative (DI). The SMD1, SMD2 and SMD3 are substituted with 0, 2 and 4 fluorine atoms on their BT moiety respectively. The assistance of DFT methods is taken to evaluate the influence of fluorine on reorganization energies, ionizing potential and electron affinity of molecules. The thermal stability of molecules is mapped by TGA studies. Cyclic voltammetry studies are carried out to comprehend the characteristics of highest molecular orbital, lowest unoccupied molecular orbital and the bandgap of molecules, which are also supported by DFT methods. The molecules displayed better absorption properties in the near-infrared (NIR) region, excellent solution processability in a variety of organic solvents, low bandgap and optimum thermal toughness to make them applicable in the construction of OBHJSCs to play the role of donor materials when connected with acceptors like fullerene derivatives.
High-efficiency synthetic method of 2,6-dibromobenzo[1,2-B:4,5-B]dithiophenol-4,8-diketone
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Paragraph 0022; 0024; 0025; 0026; 0034; 0038; 0040; 0041-042, (2017/07/20)
The invention discloses a high-efficiency synthetic method of 2,6-dibromobenzo[1,2-B:4,5-B]dithiophenol-4,8-diketone. The high-efficiency synthetic method comprises the following steps: (1) synthesizing benzo[1,2-B:4,5-B]dithiolphenol-4,8-diketone; and (2) performing bromination reaction for the benzo[1,2-B:4,5-B]dithiolphenol-4,8-diketone. By adopting the high-efficiency synthetic method of 2,6-dibromobenzo[1,2-B:4,5-B]dithiophenol-4,8-diketone, the yield of the product 2,6-dibromobenzo[1,2-B:4,5-B]dithiophenol-4,8-diketone is greatly increased, and the requirement on the atom economy can be realized.