Synthesis of Conjugated Materials Based on Benzodithiophene - Benzothiadazole and Their Application of Organic Solar Cells

• Published in: Macromolecular research Vol. 26; no. 6; pp. 552 - 556
• Main Authors: Sylvianti, Nadhila, Kim, Youn Hwan, Kim, Dong Geun, Maduwu, Ratna Dewi, Jin, Ho Cheol, Moon, Doo Kyung, Kim, Joo Hyun
• Format: Journal Article
• Language: English
• Published: Seoul The Polymer Society of Korea 01.06.2018; Springer Nature B.V; 한국고분자학회
• Subjects: Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Complex Fluids and Microfluidics; Electrons; Energy conversion efficiency; Energy levels; Molybdenum oxides; Molybdenum trioxide; Nanochemistry; Nanotechnology; Oligomers; Organic chemistry; Photovoltaic cells; Physical Chemistry; Polymer Sciences; Soft and Granular Matter; Solar cells; Zinc oxide; 고분자공학; conjugated oligomer; organic solar cell; benzodithiophene; benzothiadiazole; thiophene
• ISSN: 1598-5032; 2092-7673
• DOI: 10.1007/s13233-018-6066-4

Electron acceptor-donor-acceptor type oligomers based on benzothiadiazole (BT) unit and a (4,8-bis((2-ethylhexyl)oxy)benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl) bis(trimethylstannane) (BDT) unit have been designed and prepared as electron-donating materials, which are 2,6-[5-(7-methyl-benzo[1,2,5]thiadiazol-4-yl)-thiophen-2-yl]-4,8-bis((2-ethylhexyl)oxy)benzo[1,2-b:4,5-b′]dithiophene) ( BDT-TBT ) and 2,6-[5′-(3′-hexyl-[2,2′]bithiophenyl-5-yl)-7-methyl-benzo[1,2,5]thiadiazole]-4,8-bis((2-ethylhexyl)oxy)benzo[1,2-b:4,5-b′]dithiophene) ( BDT-THTBT ), for Organic Solar Cells (OSCs) with PC 71 BM as electron-accepting materials. The HOMO energy level is elevated by the number of thiophene ring as a p-bridge, which lowers the band gap. Inverted-type organic solar cells (OSCs) with a configuration of ITO/ZnO/ BDT-TBT (or BDT-THTBT ):PC 71 BM/MoO 3 /Al are fabricated. OSC based on BDT-THTBT exhibits the highest power conversion efficiency (PCE) of 1.04% with the best J sc of 4.20 mA/cm 2 .