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Novel Donor–Acceptor Polymer Containing 4,7‐Bis(thiophen‐2‐yl)benzo[c][1,2,5]thiadiazole for Polymer Solar Cells with Power Conversion Efficiency of 6.21%
Author(s) -
Han Liangliang,
Bao Xichang,
Hu Tong,
Du Zhengkun,
Chen Weichao,
Zhu Dangqiang,
Liu Qian,
Sun Mingliang,
Yang Renqiang
Publication year - 2014
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201400036
Subject(s) - materials science , side chain , polymer , acceptor , polymer solar cell , conjugated system , solubility , energy conversion efficiency , band gap , polymer chemistry , root mean square , chemistry , optoelectronics , composite material , physics , quantum mechanics , condensed matter physics
In order to improve the solution processability of 4,7‐bis(thiophen‐2‐yl)benzo[c][1,2,5]thiadiazole (DTBT)‐based polymers, novel donor–acceptor polymer PTOBDTDTBT containing DTBT and benzo[1,2‐b:4,5‐b′]dithiophene (BDT) with conjugated side chain is designed and synthesized with narrow band gap 1.67 eV and low lying HOMO energy level −5.4 eV. The blend film of PTOBDTDTBT and PC 71 BM exhibits uniform and smooth film with root‐mean‐square (RMS) surface roughness 1.15 nm because of the excellent solubility of PTOBDTDTBT when six octyloxy side chains are introduced. The hole mobility of the blend film is measured to be 4.4 × 10 −5 cm 2 V −1 s −1 by the space‐charge‐limited current (SCLC) model. The optimized polymer solar cells (PSCs) based on PTOBDTDTBT /PC 71 BM exhibits an improved PCE of 6.21% with V oc = 0.80 V, J sc = 11.94 mA cm −2 and FF = 65.10%, one of the highest PCE in DTBT containing polymers.