Tuning charge transport dynamics via clustering of doping in organic semiconductor thin films
| Autor: | Peijan Wang, Lawrence A. Renna, Meenakshi Upadhyaya, Michael Lu-Díaz, Dhandapani Venkataraman, Zlatan Aksamija, Seung-Pyo Jeong, Nicholas Hight-Huf, Michael D. Barnes, Connor J. Boyle, Ljiljana Korugic-Karasz |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Materials science Electronic materials Science General Physics and Astronomy 02 engineering and technology General Biochemistry Genetics and Molecular Biology Article 03 medical and health sciences Electrical resistivity and conductivity Seebeck coefficient Thermoelectric effect lcsh:Science Kelvin probe force microscope Thermoelectrics Multidisciplinary Dopant business.industry Doping General Chemistry 021001 nanoscience & nanotechnology Thermoelectric materials Organic semiconductor 030104 developmental biology Optoelectronics lcsh:Q 0210 nano-technology business |
| Zdroj: | Nature Communications Nature Communications, Vol 10, Iss 1, Pp 1-10 (2019) |
| ISSN: | 2041-1723 |
| Popis: | A significant challenge in the rational design of organic thermoelectric materials is to realize simultaneously high electrical conductivity and high induced-voltage in response to a thermal gradient, which is represented by the Seebeck coefficient. Conventional wisdom posits that the polymer alone dictates thermoelectric efficiency. Herein, we show that doping — in particular, clustering of dopants within conjugated polymer films — has a profound and predictable influence on their thermoelectric properties. We correlate Seebeck coefficient and electrical conductivity of iodine-doped poly(3-hexylthiophene) and poly[2,5-bis(2-octyldodecyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione-3,6-diyl)-alt-(2,2′;5′,2′′;5′′,2′′′-quaterthiophen-5,5′′′-diyl)] films with Kelvin probe force microscopy to highlight the role of the spatial distribution of dopants in determining overall charge transport. We fit the experimental data to a phonon-assisted hopping model and found that the distribution of dopants alters the distribution of the density of states and the Kang–Snyder transport parameter. These results highlight the importance of controlling dopant distribution within conjugated polymer films for thermoelectric and other electronic applications. Designing organic thermoelectric materials with high electrical conductivity and Seebeck coefficient is challenging due to the direct relationship between these two properties. Here, the authors explore the role of dopant spatial distribution on thermoelectric performance in conjugated polymers. |
| Databáze: | OpenAIRE |
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