Quantitative analyses of enhanced thermoelectric properties of modulation-doped PEDOT:PSS/undoped Si (001) nanoscale heterostructures
Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) has high electrical conductivity (∼10³ S cm⁻¹) but it exhibits a low Seebeck coefficient (<15 μV K⁻¹), resulting in a low power factor. Mixing PEDOT:PSS with nanostructured semiconductors can enhance the Seebeck coefficient and a...
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Royal Society of Chemistry
2017
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| Online Access: | http://hdl.handle.net/1721.1/112327 https://orcid.org/0000-0002-2805-3353 https://orcid.org/0000-0002-9872-5688 https://orcid.org/0000-0002-3968-8530 |
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| author | Lee, Dongwook Sayed, Sayed Youssef Lee, Sangyeop Kuryak, Chris Adam Zhou, Jiawei Chen, Gang Shao-Horn, Yang |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Lee, Dongwook Sayed, Sayed Youssef Lee, Sangyeop Kuryak, Chris Adam Zhou, Jiawei Chen, Gang Shao-Horn, Yang |
| author_sort | Lee, Dongwook |
| collection | MIT |
| description | Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) has high electrical conductivity (∼10³ S cm⁻¹) but it exhibits a low Seebeck coefficient (<15 μV K⁻¹), resulting in a low power factor. Mixing PEDOT:PSS with nanostructured semiconductors can enhance the Seebeck coefficient and achieve an improved thermoelectric power factor. However, underlying mechanisms for those composite thermoelectric systems are scarcely understood so far. In this study, quantitative analyses on the electrical conductivity and Seebeck coefficient for the heterostructures of nanometer-thick PEDOT:PSS on single-crystal Si (001) on sapphire (SOS) are reported. The heterostructures have larger Seebeck coefficients up to 7.3 fold and power factors up to 17.5 fold relative to PEDOT:PSS. The electrical conductivity increased with decreasing combined thicknesses of PEDOT:PSS and Si, and the Seebeck coefficient increased with decreasing PEDOT:PSS thickness, which can be attributed to modulation doping caused by diffusion of holes from PEDOT:PSS into undoped Si. This hypothesis is supported by simulation per band alignment. The valence band offset between Si and PEDOT:PSS dominantly controls the electrical conductivity and Seebeck coefficient of the heterostructures. This study not only suggests mechanistic insights to increase the power factors of PEDOT:PSS-based composites but also opens the door for new strategies to enhance the thermoelectric efficiencies of heterostructured nanocomposite materials. |
| first_indexed | 2024-09-23T16:01:44Z |
| format | Article |
| id | mit-1721.1/112327 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:01:44Z |
| publishDate | 2017 |
| publisher | Royal Society of Chemistry |
| record_format | dspace |
| spelling | mit-1721.1/1123272022-10-02T05:49:56Z Quantitative analyses of enhanced thermoelectric properties of modulation-doped PEDOT:PSS/undoped Si (001) nanoscale heterostructures Lee, Dongwook Sayed, Sayed Youssef Lee, Sangyeop Kuryak, Chris Adam Zhou, Jiawei Chen, Gang Shao-Horn, Yang Massachusetts Institute of Technology. Department of Materials Science and Engineering Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Research Laboratory of Electronics Chen, Gang Lee, Dongwook Sayed, Sayed Youssef Lee, Sangyeop Kuryak, Chris Adam Zhou, Jiawei Chen, Gang Shao-Horn, Yang Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) has high electrical conductivity (∼10³ S cm⁻¹) but it exhibits a low Seebeck coefficient (<15 μV K⁻¹), resulting in a low power factor. Mixing PEDOT:PSS with nanostructured semiconductors can enhance the Seebeck coefficient and achieve an improved thermoelectric power factor. However, underlying mechanisms for those composite thermoelectric systems are scarcely understood so far. In this study, quantitative analyses on the electrical conductivity and Seebeck coefficient for the heterostructures of nanometer-thick PEDOT:PSS on single-crystal Si (001) on sapphire (SOS) are reported. The heterostructures have larger Seebeck coefficients up to 7.3 fold and power factors up to 17.5 fold relative to PEDOT:PSS. The electrical conductivity increased with decreasing combined thicknesses of PEDOT:PSS and Si, and the Seebeck coefficient increased with decreasing PEDOT:PSS thickness, which can be attributed to modulation doping caused by diffusion of holes from PEDOT:PSS into undoped Si. This hypothesis is supported by simulation per band alignment. The valence band offset between Si and PEDOT:PSS dominantly controls the electrical conductivity and Seebeck coefficient of the heterostructures. This study not only suggests mechanistic insights to increase the power factors of PEDOT:PSS-based composites but also opens the door for new strategies to enhance the thermoelectric efficiencies of heterostructured nanocomposite materials. 2017-11-29T14:35:12Z 2017-11-29T14:35:12Z 2016-11 2016-09 Article http://purl.org/eprint/type/JournalArticle 2040-3364 2040-3372 http://hdl.handle.net/1721.1/112327 Lee, Dongwook, et al. “Quantitative Analyses of Enhanced Thermoelectric Properties of Modulation-Doped PEDOT:PSS/undoped Si (001) Nanoscale Heterostructures.” Nanoscale 8, 47 (November 2016): 19754–19760 © 2016 The Royal Society of Chemistry https://orcid.org/0000-0002-2805-3353 https://orcid.org/0000-0002-9872-5688 https://orcid.org/0000-0002-3968-8530 en_US http://dx.doi.org/10.1039/c6nr06950a Nanoscale Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Royal Society of Chemistry Prof. Chen via Angie Locknar |
| spellingShingle | Lee, Dongwook Sayed, Sayed Youssef Lee, Sangyeop Kuryak, Chris Adam Zhou, Jiawei Chen, Gang Shao-Horn, Yang Quantitative analyses of enhanced thermoelectric properties of modulation-doped PEDOT:PSS/undoped Si (001) nanoscale heterostructures |
| title | Quantitative analyses of enhanced thermoelectric properties of modulation-doped PEDOT:PSS/undoped Si (001) nanoscale heterostructures |
| title_full | Quantitative analyses of enhanced thermoelectric properties of modulation-doped PEDOT:PSS/undoped Si (001) nanoscale heterostructures |
| title_fullStr | Quantitative analyses of enhanced thermoelectric properties of modulation-doped PEDOT:PSS/undoped Si (001) nanoscale heterostructures |
| title_full_unstemmed | Quantitative analyses of enhanced thermoelectric properties of modulation-doped PEDOT:PSS/undoped Si (001) nanoscale heterostructures |
| title_short | Quantitative analyses of enhanced thermoelectric properties of modulation-doped PEDOT:PSS/undoped Si (001) nanoscale heterostructures |
| title_sort | quantitative analyses of enhanced thermoelectric properties of modulation doped pedot pss undoped si 001 nanoscale heterostructures |
| url | http://hdl.handle.net/1721.1/112327 https://orcid.org/0000-0002-2805-3353 https://orcid.org/0000-0002-9872-5688 https://orcid.org/0000-0002-3968-8530 |
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