An all small molecule organic solar cell based on a porphyrin donor and a non-fullerene acceptor with complementary and broad absorption. (May 2020)

• Record Type: Journal Article
• Authors: Gao, Huan-Huan; Sun, Yanna; Li, Shitong; Ke, Xin; Cai, Yao; Wan, Xiangjian; Zhang, Hongtao; Li, Chenxi; Chen, Yongsheng
• Is Part Of: Dyes and pigments. Volume 176(2020)
• Publication Date: 2020-05
• Subjects: Organic solar cells -- All small molecule -- Porphyrin -- Complementary absorption; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2020.108250
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A thieno[3, 2- b ]thiophene-functionalized porphyrin molecule (DEP-TT ) with the ethynylene bridges between the diketopyrrolopyrrole and porphyrin units has been designed and synthesized as the donor material. DEP-TT exhibits a broad absorption wavelength in the visible region with the onset absorption to 898 nm of the film and a low optical band gap of 1.38 eV. IDT-C8, as the acceptor material has a relatively strong absorption spectrum ranging from 500 to 750 nm in the solid film, which exactly fills the absorption trough of DEP-TT . The power conversion efficiency (PCE) of all small molecule increased from 0.64% ( J sc = 2.61 mA cm −2, V oc = 0.82 V, and FF = 0.30) to 5.14% ( J sc = 11.15 mA cm −2, V oc = 0.71 V, and FF = 0.65) after solvent vapor annealing. The PCE of 5.14% provided valuable recommendation based on porphyrin all small molecule system, since few work has involved in this field. Graphical abstract: Image 1 Highlights: A porphyrin donor DEP-TT have been synthesized and used in an all small molecule OSCs devices. DEP-TT exhibited an onset wavelength to 898 nm on the film and a low optical band gap of 1.31 eV. The complementary absorption acceptor IDT-C8 has been used in the all small molecule devices. The optimized PCEs of 5.14% was obtained for the DEP-TT :IDT-C8 based OSCs devices.