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Abdullah,M. Shaheer Akhtar,Eun-Bi Kim,Lamiaa Fijahi,Hyung-Shik Shin,Sadia Ameen 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Benzoselenadiazole as the central acceptor unit with terminal donor unit of n-hexylbithiophene waschosen to design the symmetric donor-acceptor-donor (D–A–D) configuration based small organicchromophore, 4,7-bis(50-hexyl-[2,20-bithiophen]-5-yl)benzo[c][1,2,5]selenadiazole, RTh-BSe-ThR, forthe fabrication of solution-processed bulk-heterojunction organic solar cells (BHJ-OSCs). RTh-BSe-ThRchromophore showed assuring solubility in common organic solvents and exhibited wider absorption inthe visible region with an optical band gap (Egopt) of1.87 eV. Benzoselenadiazole unit with two nhexylbithiopheneunits exhibited an excellent electrochemical behavior with the highest occupiedmolecular orbital (HOMO) of5.38 eV and the lowest unoccupied molecular orbital (LUMO) of3.51 eV. The fabricated BHJ-OSCs with RTh-BSe-ThR:PC61BM (1:3, w/w) blend thinfilm displayed a powerconversion efficiency (PCE) of3.46% and a high value of short circuit current density (JSC) of11.20 mA/cm2. The enhancement in the photovoltaic parameters might be attributed to the significantimprovements in the interfacial area of bulk heterojunction which might enhance the light harvestingproperty and the shunt resistance of the blend thinfilms.