Year: 2017
Type: article
Abstract: Thin films of p‐ and n‐type organic semiconductors for thermoelectrical (TE) applications are produced by doping of tetrathiotetracene (TTT). To obtain p‐type material TTT is doped with iodine during vacuum deposition of thin films or by postdeposition doping using controlled exposure to iodine vapors. Thermal codeposition in vacuum of TTT and tetracyanoquinodimethane (TCNQ) is used to prepare n‐type thin films. The attained thin films are characterized by measurements of the Seebeck coefficient and electrical conductivity. The Seebeck coefficient and conductivity can be varied by altering the doping level. p‐type TTT:iodide thin films with a power factor of 0.52 μW m−1 K−2, an electrical conductivity of 130 S m−1, and a Seebeck coefficient of 63 μV K−1 and n‐type TCNQ:TTT films with a power factor of 0.33 μW m−1 K−2, an electrical conductivity of 57 S m−1, and a Seebeck coefficient of −75 μV K−1 are produced. Engineered deposition of both p‐ and n‐type thermoelectric conducting elements on the same substrate is demonstrated. A proof of concept prototype of planar thin film TE generator based on a single p–n couple from the organic materials is built and its power generation is characterized.
Source: Advanced Electronic Materials
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2568142314