Title: Dichlorinated Dithienylethene-Based Copolymers for Air-Stable n-Type Conductivity and Thermoelectricity

Abstract

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^-1 were obtained from the chlorinated and fluorinated polymers with N-DMBI, respectively, and 12.4 and 2.4 S cm^-1 were obtained from the chlorinated and fluorinated polymers with CoCp₂, respectively, from drop-cast devices. The corresponding power factors are 22.7, 7.6, 39.5 and 8.0 μW m^-1 K^-2, 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^-1 after 222 days in the air, the longest for an n-doped polymer stored in air, with a thermoelectric power factor of 9.3 μW m^-1 K^-2. 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 ofmore » n-type donor-acceptor polymers.« less

Authors:

Han, Jinfeng ^[1]; Fan, Huidong ^[1]; Zhang, Qingyang ^[1]; Hu, Qin ^[2]; Russell, Thomas P. ^[3]; Katz, Howard E.  ^[1]

• Search DOE PAGES for author "Katz, Howard E."
• Search DOE PAGES for ORCID "0000-0002-3190-2475"

---

+ Show Author Affiliations

1. Johns Hopkins Univ., Baltimore, MD (United States)
2. Univ. of Massachusetts, Amherst, MA (United States)
3. Univ. of Massachusetts, Amherst, MA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Publication Date:

Fri Oct 23 00:00:00 EDT 2020

Research Org.:

Johns Hopkins Univ., Baltimore, MD (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR)

OSTI Identifier:

1773756

Alternate Identifier(s):

OSTI ID: 1804245

Grant/Contract Number:  

FG02-07ER46465; 1708245; N00014-17-1-2241

Resource Type:

Accepted Manuscript

Journal Name:

Advanced Functional Materials

Additional Journal Information:

Journal Volume: 31; Journal Issue: 5; Journal ID: ISSN 1616-301X

Publisher:

Wiley

Country of Publication:

United States

Language:

English

Subject:

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE; dichlorinated dithienylethene; air stability; n-type; organic thermoelectricity