Dichlorinated Dithienylethene-Based Copolymers for Air-Stable n-Type Conductivity and Thermoelectricity [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 621.31 Generation, modification, storage, transmission of electric power
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2020
• Mô tả vật lý: Size: Article No. 2005901 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 255580
• Chủ đề: 1. 30 direct energy conversion; 2. 36 materials science; 3. 37 inorganic, organic, physical, and analytical chemistry; 4. Air stability; 5. Dichlorinated dithienylethene; 6. N-type; 7. Organic thermoelectricity

Tóm tắt

 Here, two donor-acceptor polymers were obtained by coupling difluoro- and dichloro-substituted forms of the electron-deficient unit BDOPV and the relatively weak donor moiety dichlorodithienylethene (ClTVT). The conductivity and power factors of doped devices are different for the chlorinated and fluorinated BDOPV polymers. High electron conductivity of 38.3 and 16.1 S cm<
 sup>
 -1<
 /sup>
  were obtained from the chlorinated and fluorinated polymers with N-DMBI, respectively, and 12.4 and 2.4 S cm<
 sup>
 -1<
 /sup>
  were obtained from the chlorinated and fluorinated polymers with CoCp<
 sub>
 2<
 /sub>
 , respectively, from drop-cast devices. The corresponding power factors are 22.7, 7.6, 39.5 and 8.0 ?W m<
 sup>
 -1<
 /sup>
  K<
 sup>
 -2<
 /sup>
 , respectively. Doping of PClClTVT with N-DMBI results in excellent air-stability
  the electron conductivity of devices with 50 mol% N-DMBI as dopant remained up to 4.9 S m<
 sup>
 -1<
 /sup>
  after 222 days in the air, the longest for an n-doped polymer stored in air, with a thermoelectric power factor of 9.3 ?W m<
 sup>
 -1<
 /sup>
  K<
 sup>
 -2<
 /sup>
 . However, the conductivity of PFClTVT-based devices can hardly be measured after 103 days. These observations are consistent with morphologies determined by grazing incidence wide angle X-ray scattering (GIWAXS) and atomic force microscopy (AFM). The results demonstrate that chemical structures leading to dense and ordered packing can enhance electron conductivity and air stability of n-type donor-acceptor polymers.