A new small molecule with indolone chromophore as the electron accepting unit for efficient organic solar cells

作者：Fan Ling; Cui Ruili; Jiang Lihui^*; Zou Yingping; Li Yongfang; Qian Dong

来源：Dyes and Pigments, 2015, 113: 458-464.

DOI：10.1016/j.dyepig.2014.08.027

• Indolone chromophore
• Benzodithiophene
• Organic solar cells
• High open circuit voltage
• High fill factor
• High performance

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.

• 单位
  中国科学院; 中南大学