Synthesis of the diketopyrrolopyrrole/terpyridine substituted carbazole derivative based polythiophenes for photovoltaic cells

• Published in: RSC advances Vol. 1; no. 16; pp. 9525 - 9535
• Main Authors: Wang, Shih-Hao, Wang, Teng-Wei, Tsai, Hsieh-Chih, Yang, Po-Chih, Huang, Chih-Feng, Lee, Rong-Ho
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 05.03.2020; The Royal Society of Chemistry
• Subjects: Butyric acid; Carbazoles; Chemistry; Indium tin oxides; Photovoltaic cells; Polythiophene; Substitutes; Thermal stability
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/c9ra09649c

A series of conjugated polythiophenes (PTs) having low band gap energies ( PDPP , PDPCz21 , PDPCz11 ), with 2-ethylhexyl-functionalized 2,5-thienyl diketopyrrolopyrrole (TDPP) as the electron acceptor and terpyridine-substituted carbazole (TPCz) as the electron donor, have been synthesized and studied for their applicability in polymer-based photovoltaic cells (PVCs). The thermal stability and solvent solubility of PTs increased upon increasing the content of the TPCz derivative. PVCs were fabricated having the following architecture: indium tin oxide/poly(3,4-ethylenedioxythiophene):polystyrenesulfonate/PT:6,6-phenyl-C 71 -butyric acid methyl ester (PC 71 BM)/Ca/Ag. The compatibility between the PT and PC 71 BM improved upon increasing the TPCz content. The photovoltaic properties of the PDPCz21 -based PVCs were superior to those of their PDPP - and PDPCz11 -based counterparts. A series of conjugated polythiophenes (PTs) having low band gap energies ( PDPP , PDPCz21 , PDPCz11 ) have been synthesized and studied for their applicability in polymer-based photovoltaic cells (PVCs).