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

Gao, HH (Gao, Huan-Huan)^{[ 1 ]} ; Sun, YN (Sun, Yanna)^{[ 2 ]} ; Li, ST (Li, Shitong)^{[ 2 ]} ; Ke, X (Ke, Xin)^{[ 2 ]} ; Cai, Y (Cai, Yao)^{[ 2 ]} ; Wan, XJ (Wan, Xiangjian)^{[ 2 ]} ; Zhang, HT (Zhang, Hongtao)^{[ 2 ]} ; Li, CX (Li, Chenxi)^{[ 2 ]} ; Chen, YS (Chen, Yongsheng)^{[ 2 ]}

DYES AND PIGMENTS, 2020, 176: 文献号: 108250

DOI: 10.1016/j.dyepig.2020.108250

摘要

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.