4.7 Article

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

Journal

DYES AND PIGMENTS
Volume 176, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2020.108250

Keywords

Organic solar cells; All small molecule; Porphyrin; Complementary absorption

Funding

  1. MOST [2019YFA0705900]
  2. NSFC of China [21935007, 51773095, 51873089]
  3. Tianjin city [17JCJQJC44500, 17JCZDJC31100]
  4. 111 Project [B12015]

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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.

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