Synthesis and characterization of a new phenanthrenequinoxaline‐based polymer for organic solar cells |
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| Authors: | Eunsol Jo Jong Baek Park Woo‐Hyung Lee Ji‐Hoon Kim In Hwan Jung Do‐Hoon Hwang In‐Nam Kang |
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| Affiliation: | 1. Department of Chemistry, the Catholic University of Korea, Bucheon, Gyeonggi‐Do, Republic of Korea;2. Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University, Busan, Republic of Korea;3. Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT), Daejeon, Republic of Korea |
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| Abstract: | Two donor–acceptor (D‐A) conjugated polymers, PQx and PphQx, composed of alkylthienyl‐substituted benzo1,2‐b:4,5‐b']dithiophene (BDTT) as the electron donor and the new electron acceptors quinoxaline (Qx) or phenanthrenequinoxaline (phQx), were synthesized with Stille cross‐coupling reactions. The number‐averaged molecular weights (Mn) of PQx and PphQx were found to be 25.1 and 23.2 kDa, respectively, with a dispersity of 2.6. The band‐gap energies of PQx and PphQx are 1.82 and 1.75 eV, respectively. These results indicate that, because phQx units have highly planar structures, their inclusion in D‐A polymers will be a very effective method for increasing the polymers' effective conjugation lengths. The hole mobilities of PQx and PphQx were determined to be 5.0 × 10?5 and 2.2 × 10?4 cm2 V?1 s?1, respectively. A polymer solar cell device prepared with PphQx as the active layer was found to exhibit a power conversion efficiency (PCE) of 5.03%; thus, the introduction of phQx units enhanced both the short circuit current density and PCE of the device. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54, 2804–2810 |
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| Keywords: | charge transport conjugated polymers functionalization of polymers heteroatom‐containing polymers organic solar cell |
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