Thiazolothienyl imide-based wide bandgap copolymers for efficient polymer solar cells

Shi, Yongqiang1,2,3,4; Tang, Yumin3,4; Yang, Kun3,4; Qin, Minchao5; Wang, Yang3,4; Sun, Huiliang3,4; Su, Mengyao3,4; Lu, Xinhui5; Zhou, Ming1,2; Guo, Xugang3,4

2019-09-28

10.1039/c9tc03301g

Journal of Materials Chemistry C   影响因子和分区

2050-7526

2050-7534

Two new wide bandgap copolymers PTzTIBDTT and PTzTIBDTT-S based on thiazolothienyl imide (TzTI) and benzodithiophene with a distinct side chain were synthesized and characterized for applications in polymer solar cells (PSCs). The single crystal of the TzTI model compound showed a highly planar backbone with a close pi-stacking distance of 3.65 angstrom, a desired structural feature for efficient charge transport. Moreover, the TzTI incorporation can trigger intramolecular noncovalent NMIDLINE HORIZONTAL ELLIPSISS interactions to yield a self-planarized polymer backbone, which should be beneficial for achieving ordered molecular packing and efficient charge transport. Due to its strong electron-withdrawing effect, the incorporation of the TzTI unit largely lowers the polymer HOMO levels to -5.65 and -5.69 eV for PTzTIBDTT and PTzTIBDTT-S, respectively. The PSCs containing the PTzTIBDTT:PC71BM active layer exhibited a promising power conversion efficiency (PCE) of 8.00% with a large V-oc of 0.90 V. To the best of our knowledge, the PCE is among the highest values for fullerene PSCs based on an imide-containing polymer donor. This work not only demonstrates that thiazolothienyl imide is a promising building block for constructing high-performance wide bandgap photovoltaic polymer semiconductors, but also reveals that a noncovalent NMIDLINE HORIZONTAL ELLIPSISS conformational lock is an effective molecular design approach for enabling polymer semiconductors with a planar backbone for efficient PSCs.

SCI ; EI

英语

通讯

China Postdoctoral Science Foundation[2018M630267]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied

WOS:000487025600007

ROYAL SOC CHEMISTRY

20193907465576

Energy gap ; Polymers ; Single crystals ; Wide band gap semiconductors

Polymeric Materials:815.1 ; Crystalline Solids:933.1

Web of Science

1.Southwest Petr Univ, Sch Mat Sci & Engn, Chengdu 610500, Sichuan, Peoples R China
2.State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China
3.Southern Univ Sci & Technol SUSTech, Dept Mat Sci & Engn, 1088 Xueyuan Rd, Shenzhen 518055, Guangdong, Peoples R China
4.Southern Univ Sci & Technol SUSTech, Shenzhen Key Lab Printed Organ Elect, 1088 Xueyuan Rd, Shenzhen 518055, Guangdong, Peoples R China
5.Chinese Univ Hong Kong, Dept Phys, Hong Kong 999077, Peoples R China

Shi, Yongqiang,Tang, Yumin,Yang, Kun,et al. Thiazolothienyl imide-based wide bandgap copolymers for efficient polymer solar cells[J]. Journal of Materials Chemistry C,2019,7(36):11142-11151.

Shi, Yongqiang.,Tang, Yumin.,Yang, Kun.,Qin, Minchao.,Wang, Yang.,...&Guo, Xugang.(2019).Thiazolothienyl imide-based wide bandgap copolymers for efficient polymer solar cells.Journal of Materials Chemistry C,7(36),11142-11151.

Shi, Yongqiang,et al."Thiazolothienyl imide-based wide bandgap copolymers for efficient polymer solar cells".Journal of Materials Chemistry C 7.36(2019):11142-11151.