A new small molecule with indolone chromophore as the electron accepting unit for efficient organic solar cells
摘要:
A new small molecule (TIBDT) with indolone chromophore as the electron acceptor unit and benzodithiophene as electron donor unit was synthesized and first applied in organic solar cells (OSCs). TIBDT was characterized by NMR, TGA, UV-Vis absorption spectroscopy and cyclic voltammetry measurements. Results show that TIBDT possesses excellent thermal stability, appropriate absorption spectra, low-lying highest occupied molecular orbital (HOMO) level and high hole mobility. The OSCs based on TIBDT: PC71BM (1:1, w/w) showed a power conversion efficiency (PCE) up to 3.94% with an open circuit voltage (V-OC) of 0.89 V, short circuit current (J(SC)) of 736 mA cm(-2), fill factor (FF) of 60.2% under the illumination of AM 1.5 G, 100 mW cm(-2) without solvent additives and thermal annealing treatment. These preliminary investigations show that indolone chromophore can probably be an excellent electron accepting unit for constructing high performance optoelectronic materials. (C) 2014 Elsevier Ltd. All rights reserved.
planar molecules, exhibiting strong absorption in the 713-724 nm range and displaying comparable electron and hole mobilities in thin films (maximum value 1 × 10(-3) cm(2)/(V·s)). Bulk heterojunction solarcells assembled with these dyes and a fullerene derivative (PC(61)BM) at a low ratio give a power conversion efficiency as high as 4.7%, with short-circuit current values of 14.2 mA/cm(2), open-circuit
synthesis from dithiooxamide and various aldehydes. When adequately engineered, such dyes could be used as fluorescent bridges with other dyes. A sequence of highly efficient, intramolecular electronic‐energy‐transfer steps followed from selective illumination of the fluorescent centre in the molecular triads.