Enhanced and Tunable Open-Circuit Voltage using Dialkylthio Benzo[1,2-b:4,5-b′]dithiophene in Polymer Solar Cells

Autor:	Emir Hubijar, Doyun Lee, John P. Ferraris, Grace Jones D. Kalaw
Rok vydání:	2012
Předmět:	chemistry.chemical_classification Electron mobility Materials science Open-circuit voltage General Chemical Engineering General Chemistry Polymer Conjugated system Polymer solar cell Chemical engineering chemistry Polymer chemistry Materials Chemistry Alkoxy group Copolymer Side chain
Zdroj:	Chemistry of Materials. 24:2534-2540
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm3011056
Popis:	In this study, we explore the effect of the dialkoxy and dithioalkoxy side chains on the benzo [1,2-b:4,5-b′]dithiophene (BDT) unit by comparing the O-BDT homopolymer (O-PBDT), S-BDT homopolymer (S-PBDT), and S-BDT-alt-O-BDT copolymer (SO-PBDT) by computational calculations and experimental results. The polymers were prepared by Pd-catalyzed Stille coupling. Additionally, hole mobility and film morphology were studied by fabricating organic field effect transistors (OFETs) and using TappingMode AFM, respectively. The photovoltaic properties of the polymers were measured from fabricated PSC devices. The replacement of the alkoxy (−OR) groups with thioalkoxy (−SR) groups lowered the HOMO energy level of the conjugated polymers from 5.31 to 5.41 eV, and consequently enhanced Voc, while still preserving the excellent properties offered by the BDT-based polymers. Especially, high Voc of 0.99 V was achieved from S-PBDT polymer based PSC with up to 4.0% of PCE, which is one of the highest efficiencies reported f...
Databáze:	OpenAIRE
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