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Title: Quantitative analyses of enhanced thermoelectric properties of modulation-doped PEDOT:PSS/undoped Si (001) nanoscale heterostructures

Abstract

Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) has high electrical conductivity (~103 S cm–1) but it demonstrates 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. Yet, underlying mechanisms for those composite thermoelectric systems are scarcely understood so far. Here, 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.

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [1]
+ Show Author Affiliations
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Cairo Univ., Giza (Egypt)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Energy Frontier Research Center (EFRC) Solid-State Solar-Thermal Energy Conversion Center (S3TEC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1388362
Grant/Contract Number:  
SC0001299; FG02-09ER46577
Resource Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 8; Journal Issue: 47; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Lee, Dongwook, Sayed, Sayed Youssef, Lee, Sangyeop, Kuryak, Chris Adam, Zhou, Jiawei, Chen, Gang, and Shao-Horn, Yang. Quantitative analyses of enhanced thermoelectric properties of modulation-doped PEDOT:PSS/undoped Si (001) nanoscale heterostructures. United States: N. p., 2016. Web. doi:10.1039/C6NR06950A.
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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. United States. https://doi.org/10.1039/C6NR06950A
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Lee, Dongwook, Sayed, Sayed Youssef, Lee, Sangyeop, Kuryak, Chris Adam, Zhou, Jiawei, Chen, Gang, and Shao-Horn, Yang. Tue . "Quantitative analyses of enhanced thermoelectric properties of modulation-doped PEDOT:PSS/undoped Si (001) nanoscale heterostructures". United States. https://doi.org/10.1039/C6NR06950A. https://www.osti.gov/servlets/purl/1388362.
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@article{osti_1388362,
title = {Quantitative analyses of enhanced thermoelectric properties of modulation-doped PEDOT:PSS/undoped Si (001) nanoscale heterostructures},
author = {Lee, Dongwook and Sayed, Sayed Youssef and Lee, Sangyeop and Kuryak, Chris Adam and Zhou, Jiawei and Chen, Gang and Shao-Horn, Yang},
abstractNote = {Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) has high electrical conductivity (~103 S cm–1) but it demonstrates 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. Yet, underlying mechanisms for those composite thermoelectric systems are scarcely understood so far. Here, 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.},
doi = {10.1039/C6NR06950A},
journal = {Nanoscale},
number = 47,
volume = 8,
place = {United States},
year = {Tue Nov 08 00:00:00 EST 2016},
month = {Tue Nov 08 00:00:00 EST 2016}
}
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https://doi.org/10.1039/C6NR06950A
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    Flexible Thermoelectric Materials and Generators: Challenges and Innovations
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