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Wide-bandgap polymer based on alkylphenyl-substituted benzo[1,2-b:4,5-b']dithiophene unit with high power conversion efficiency of over 11%

Abstract

A novel wide-bandgap conjugated polymer (PTZP) based on alkylphenyl-substituted benzo[1,2-b:4,5-b']dithiophene (BDT-P) as electron-rich unit and thiazolo[5,4-d]thiazole (TTz) as electron-deficient unit was designed and synthesized for non-fullerene polymer solar cells (PSCs) application. The polymer exhibits a wide bandgap of 2.01 eV with strong absorption in the range of 300-620 nm, which is complementary with that of fused-ring small molecule acceptor (SMA) 2,2'-((2Z,2'Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IDIC), and a deep highest occupied molecular orbital (HOMO) energy level of -5.41 eV. Furthermore, the polymer film possesses strong crystallinity and a dominated face on stacking with a small d-spacing of 3.65 Å, resulting in a high hole mobility of 4.01 × 10-3 cm2 V-1 s-1. The optimal PSCs based on the PTZP:IDIC blend show a high PCE of 11.8%, with an open-circuit voltage (Voc) of 0.90 V, a short-circuit current density (Jsc) of 17.9 mA cm-2 and a fill factor (FF) of 73.3%. Meanwhile, the devices also exhibit outstanding performance with PCE over 10% with the active layer thickness of up to 200 nm or the area of up to 0.81 cm2, resulting from the excellent molecular stacking. These results reveal that the PTZP will be a promising conjugated polymer for the fabrication of efficient large-area PSCs.

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Publication details

The article was received on 19 Jun 2018, accepted on 27 Jul 2018 and first published on 31 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA05868G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Wide-bandgap polymer based on alkylphenyl-substituted benzo[1,2-b:4,5-b']dithiophene unit with high power conversion efficiency of over 11%

    X. Guo, W. Li, H. Guo, B. Guo, J. Wu, W. Ma, M. Zhang and W. (. Wong, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA05868G

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