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http://dx.doi.org/10.5012/bkcs.2014.35.6.1647

Synthesis and Characterization of Phenanthrene-substituted Fullerene Derivatives as Electron Acceptors for P3HT-based Polymer Solar Cells  

Mi, Dongbo (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University)
Park, Jong Baek (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University)
Xu, Fei (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University)
Kim, Hee Un (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University)
Kim, Ji-Hoon (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University)
Hwang, Do-Hoon (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University)
Publication Information
Bulletin of the Korean Chemical Society / v.35, no.6, 2014 , pp. 1647-1653 More about this Journal
Abstract
9,10-Bis(bromomethyl)phenanthrene reacted with fullerenes via a Diels-Alder reaction to give phenanthrene-substituted fullerene mono-adducts (PCMA) and bis-adducts (PCBA) as electron acceptors for organic photovoltaic cells (OPVs). The syntheses of the fullerene derivatives were confirmed by $^1H$ $^{13}C$ NMR spectroscopy and MALDI-TOF mass spectrometry. PCMA and PCBA showed better light absorption in the UV-visible region than $PC_{61}BM$. Their electrochemical properties were measured using cyclic voltammetry. Accordingly, the lowest unoccupied molecular orbital (LUMO) energy levels of PCMA and PCBA were -3.66 and -3.57 eV, respectively. Photovoltaic cells were fabricated with a ITO/PEDOT:PSS/poly(3-hexylthiophene)(P3HT):acceptor/LiF/Al configuration, where P3HT and PCBA are the electron donors and acceptors, respectively. The polymer solar cell fabricated using the P3HT:PCBA active layer showed a maximum power conversion efficiency of 0.71%.
Keywords
Phenanthrene-substituted fullerene; Electron acceptor; Organic photovoltaic cells;
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