Electrode material dependent p- or n-like thermoelectric behavior of single electrochemically synthesized poly(2,2′–bithiophene) layer—application to thin film thermoelectric generator
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Abstract
We prepared poly(2,2′–bithiophene) (PBT) on top of Au and indium-tin oxide (ITO) bottom electrodes and determined the Seebeck coefficient in devices with Al top electrode. Negative Seebeck coefficient was observed in ITO/PBT/Al devices, whereas Au/PBT/Al devices showed positive Seebeck coefficient. This difference allowed the construction of a complete thermoelectric thin film generator with top electrode of Al and bottom electrode of ITO and Au (each one at half of the electrode area) in a single organic layer deposition step. The thermoelectric generator achieves ca. 800 μV K−1 at room temperature, which is a very high value for conjugated polymer-based devices.
Keywords
Polybithiophene Organic thermogenerator Seebeck coefficientNotes
Acknowledgments
The authors thank the financial support from CAPES and CNPQ. IAH would like to thank Prof. Frank Karasz for the issue related motivation and discussion over the years and Prof. Miguel Abbate for helpful discussions regarding XPS results. Authors also thank the Analysis and Testing Center of Huazhong University of Science and Technology for XPS measurements.
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