Polaron interfacial occupied entropy engineering (IMAGE)
Caption
(a) Photochromic reaction scheme for DAE between the open and closed molecular conformations under UV irradiation. (b) Schematic showing the different coupling states for DAE and 6EDOT. (The “coupling 0” indicates that the C-C=C-C cyclopentene bonds of DAE are oriented in the same direction as the carbon skeleton of the PEDOT polymer. “Coupling 1” indicates that the C-C=C-C cyclopentene bonds of DAE are oriented in the opposite direction from the carbon skeleton of the PEDOT polymer.) (c) Electrostatic potential of the 0-type coupling state 6EDOT-1DAE and schematic of the 6EDOT-3DAE triply degenerate states with different coupling forms. The red ellipse represents the polaron interface states. (d) Thermovoltage between hot and cold end evolution of a PEDOT: PSS-xDAE (x = 38 wt.%) sample with the UV light turned on or off (the UV laser power was 1.3 W cm-2). (e) The thermopower-electrical conductivity relationships of PEDOT:PSS films made with different treatment methods. (f) The increasing thermopower resulting from polaron interfacial occupied entropy calculation for DAE molecules and six EDOT units with different degeneracies.
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