期刊
ADVANCED ELECTRONIC MATERIALS
卷 8, 期 10, 页码 -出版社
WILEY
DOI: 10.1002/aelm.202200456
关键词
conductivity; doping; indacenodithiophene; organic thermoelectrics; power factor
资金
- National Research Foundation (NRF) of Korea [2019R1A2C2085290, 2020M3H4A3081814, 2019R1A6A1A11044070, 2019R1A6A1A11051471, 2021R1A2C1007304, 2020R1A5A1019141]
- KU-KIST School Program
- National Research Foundation of Korea [2021R1A2C1007304] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Three p-type thermoelectric polymers based on the indacenodithiophene moiety substituted with bis(alkylsulfanyl)methylene side-chains (IDTS) were synthesized and their thermoelectric characteristics were investigated. Compared to donor-acceptor (D-A) type polymers, the donor-donor' (D-D') type polymer PIDTSDTTT exhibited higher electrical conductivity and power factor when doped with AuCl3. The higher conductivity of PIDTSDTTT originated from its higher carrier concentration. Additionally, PIDTSDTTT showed more stable charge carriers and higher doping stability.
Three p-type thermoelectric (TE) polymers based on the indacenodithiophene moiety substituted with bis(alkylsulfanyl)methylene side-chains (IDTS) are synthesized. The TE characteristics of IDTS-based donor-donor' (D-D ') type PIDTSDTTT and donor-acceptor (D-A) type polymers, PIDTSBT and PIDTS2FBT are investigated. Remarkably higher electrical conductivity (sigma = approximate to 1000 S cm(-1)) and power factor (PF = approximate to 120 mu W m(-1) K-2) by doping with AuCl3 are measured for PIDTSDTTT compared to D-A type polymers. The higher sigma of PIDTSDTTT originates from its higher carrier concentration compared to those of PIDTSBT and PIDTS2FBT. Moreover, the facile polaron-to-bipolaron transition is measured, and the charge carriers are calculated to be more stable with extended delocalization in PIDTSDTTT compared to D-A polymers. The significantly higher doping stability in PIDTSDTTT can be explained in terms of the higher conduction band of bipolarons than the valence band of O-2 and H2O, which blocks the facile reduction of bipolarons in air. The energetic structures of doped polaron and bipolaron states, as well as pristine TE polymers, must be carefully considered to realize efficient and stable p-type thermoelectric polymers, where a D-D ' type structure with further enhanced carrier mobility can be considered as a potential molecular framework.
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