A spiro-bifluorene based 3D electron acceptor with dicyanovinylene substitution for solution-processed non-fullerene organic solar cells

作者：Xia Debin; Gehrig Dominik; Guo Xin; Baumgarten Martin^*; Laquai Frederic; Muellen Klaus

来源：Journal of Materials Chemistry A, 2015, 3(20): 11086-11092.

DOI：10.1039/c5ta00108k

A novel electron acceptor, namely 2,2'-(12H,12'H-10,10'-spirobi[indeno[2,1-b] fluorene]-12,12'-diylidene) dimalononitrile (4CN-spiro), exhibiting a three-dimensional molecular structure was synthesized and its thermal, photophysical, electrochemical, crystal, and photovoltaic properties were investigated. The novel acceptor exhibits excellent thermal stability with a decomposition temperature of 460 degrees C, an absorption extending to 600 nm, and a LUMO level of -3.63 eV. Solution processed bulk-heterojunction (BHJ) organic solar cells were fabricated using 4CN-spiro as an acceptor and polythieno[3,4-b]-thiophene-cobenzodithiophene (PTB7) as a donor polymer. The effect of the donor-to-acceptor ratio and processing conditions on the device performance was investigated. A device processed from tetrachloroethane with a donor to acceptor weight ratio of 1 : 1 yielded a power conversion efficiency (PCE) of 0.80%.

• 出版日期2015