Copolymerization of 3,3′′′-didodecylquaterthiophene with fluorene and silole units: improving photovoltaic performance by tuning energy levels
Literature Information
Jun Gao, Weiqi Tong, Qun Qian, Kunhua Lin
We report the design, synthesis and characterization of two copolymers, PQTF and PQTTST, based on 3,3′′′-didodecylquaterthiophene (QT), fluorene and 2,5-dithienylsilole. The spectroscopic, thermal properties and electrochemical properties were investigated. Thermal gravimetric analysis showed that they have good thermal stability with the decomposition temperature higher than 400 °C. The UV-vis absorption and cyclic voltammetry measurements revealed that the introduction of a fluorene unit into the backbone of PQTF resulted in a blue-shift of the longest wavelength absorption and a reduction of the HOMO level to −5.32 eV, while the absorption spectra red-shifted, and the LUMO level reduced to −3.59 eV with the incorporation of a 2,5-dithienylsilole unit into the backbone of PQTTST. In comparison with the homopolymer PQT, the copolymers exhibited disordered alkyl chain stacking. Bulk-heterojunction solar cells fabricated with PQTTST and PC60BM displayed power conversion efficiencies (PCE) of 1.49%, short-circuit currents (Jsc) of 4.77 mA cm−2 and open-circuit voltages (Voc) of 0.72 V. This PCE is the highest recorded for QT-based polymer donor and PC60BM acceptor bulk heterojunction (BHJ) photovoltaic cells.
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