2-alkyl-5-thienyl-substituted benzo[1,2- b:4,5- b ′]dithiophene-based donor molecules for solution-processed organic solar cells

Dhananjaya Patra, Tzu Yen Huang, Chao Cheng Chiang, Ramon Orlando Valencia Maturana, Chun Wei Pao, Kuo Chuan Ho, Kung-Hwa Wei, Chih Wei Chu*

*此作品的通信作者

研究成果: Article同行評審

66 引文 斯高帕斯(Scopus)

摘要

In this study, we have strategically designed and convergently synthesized two novel, symmetrical, and linear A-D-A-type π-conjugated donor molecules (TBDTCNR, TBDTCN), each containing a planar electron-rich 2-octylthiene-5-yl- substituted benzodithiophene (TBDT) unit as the core, flanked by octylthiophene units and end-capped with electron-deficient cyanoacetate (CNR) or dicyanovinyl (CN) units. We thoroughly characterized both of these materials and investigated the effects of the end groups (CNR, CN) on their optical, electrochemical, morphological, and photovoltaic properties. We then fabricated solution-processed bulk heterojunction organic solar cells incorporating TBDTCNR and TBDTCN. Among our tested devices, the one containing TBDTCNR and [6,6]-phenyl-C61-butyric acid methyl ester in a 1:0.40 ratio (w/w) exhibited the highest power conversion efficiency (5.42%) with a short-circuit current density (Jsc) of 9.08 mA cm-2, an open circuit voltage (Voc) of 0.90 V, and an impressive fill factor (FF) of 0.66 under AM 1.5G irradiation (100 mW cm-2). The FFs of these solution-processed small-molecule organic solar cells (SMOSCs) are outstanding when compared with those recently reported for benzodithiophene (BDT)-based SMOSCs, because of the high crystallinity and excellent stacking properties of the TBDT-based compounds.

原文English
頁(從 - 到)9494-9500
頁數7
期刊ACS Applied Materials and Interfaces
5
發行號19
DOIs
出版狀態Published - 18 10月 2013

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