TY - JOUR
T1 - Dithienothiapyran
T2 - An Excellent Donor Block for Building High-Performance Copolymers in Nonfullerene Polymer Solar Cells
AU - Deng, Min
AU - Xu, Xiaopeng
AU - Lee, Young Woong
AU - Woo, Han Young
AU - Bi, Zhaozhao
AU - Ma, Wei
AU - Li, Ying
AU - Peng, Qiang
N1 - Funding Information:
We acknowledge the financial support of NSFC (21825502, 21432005, 91633301 and 51573107) and the foundation of SKLPME (sklpme2017-2-04).
PY - 2019/1/23
Y1 - 2019/1/23
N2 - In this work, a new but excellent donor block dithienothiapyran (DTTP) was developed for constructing highly efficient wide band gap copolymer donors. Compared to dithienopyran (DTP), DTTP features weaken electron-donating ability and more planar-conjugated backbones. Polymer-fluorinated benzotriazole (FBTA) based on DTTP exhibits lower highest occupied molecular orbital level (-5.30 vs -5.21 eV), higher molar extinction coefficient (1.54 × 10 5 vs 8.65 × 10 4 M -1 cm -1 ), and better crystallinity than -FBTA based on DTP, thus producing a higher device performance of 10.51% in binary blend nonfullerene polymer solar cells (NF-PSCs) blended with IT-M. To improve the absorption strength of PDTTP-FBTA: devices in the shorter wavelength range and further optimize the blend morphology, a small molecule of, which has strong absorption at short wavelength (300-600 nm), was incorporated. Finally, the performance of the ternary blends was successfully enhanced to 11.57% and a very high fill factor of 76.5%. Our work provided a new but excellent donor block for building high-performance conjugated copolymers to achieve highly efficient NF-PSCs.
AB - In this work, a new but excellent donor block dithienothiapyran (DTTP) was developed for constructing highly efficient wide band gap copolymer donors. Compared to dithienopyran (DTP), DTTP features weaken electron-donating ability and more planar-conjugated backbones. Polymer-fluorinated benzotriazole (FBTA) based on DTTP exhibits lower highest occupied molecular orbital level (-5.30 vs -5.21 eV), higher molar extinction coefficient (1.54 × 10 5 vs 8.65 × 10 4 M -1 cm -1 ), and better crystallinity than -FBTA based on DTP, thus producing a higher device performance of 10.51% in binary blend nonfullerene polymer solar cells (NF-PSCs) blended with IT-M. To improve the absorption strength of PDTTP-FBTA: devices in the shorter wavelength range and further optimize the blend morphology, a small molecule of, which has strong absorption at short wavelength (300-600 nm), was incorporated. Finally, the performance of the ternary blends was successfully enhanced to 11.57% and a very high fill factor of 76.5%. Our work provided a new but excellent donor block for building high-performance conjugated copolymers to achieve highly efficient NF-PSCs.
KW - dithienothiapyran
KW - donor building block
KW - fullerene-free polymer solar cells
KW - ternary blend devices
KW - wide band gap copolymer donors
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U2 - 10.1021/acsami.8b18493
DO - 10.1021/acsami.8b18493
M3 - Article
C2 - 30584758
AN - SCOPUS:85060445173
VL - 11
SP - 3308
EP - 3316
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 3
ER -