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Hwang S, Jeong I, Park J, Kim JK, Kim H, Lee T, Kwak J, Chung S. Enhanced Output Performance of All-Solution-Processed Organic Thermoelectrics: Spray Printing and Interface Engineering. ACS APPLIED MATERIALS & INTERFACES 2020; 12:26250-26257. [PMID: 32403922 DOI: 10.1021/acsami.0c04550] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We report two organocompatible strategies to enhance the output performance of all-solution-processed poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thermoelectric generators (TEGs): introducing an additive spray printing process and functionalized polymer interlayers to reduce the module resistance. The spray printing enabled the deposition of 1-μm-thick PEDOT:PSS layers with a high degree of design freedom, resulting in a significantly reduced sheet resistance of 16 Ω sq-1 that is closely related to the thermoelectric output performance. Also, by inserting an ultrathin silane-terminated polystyrene (PS) interlayer between the PEDOT:PSS thermoelectric layers and inkjet-printed Ag interconnects selectively, the contact resistivity extracted by the transmission line method was reduced from 6.02 × 10-2 to 2.77 × 10-2 Ω cm2. We found that the PS interlayers behaved as a thin tunneling layer, which facilitated the carrier injection from the inkjet-printed Ag electrodes into the PEDOT:PSS films by field emission with an effectively lowered energy barrier. The activation energy was also extracted using the Richardson equation, resulting in a reduction of 2.59 ± 0.04 meV after the PS treatment. Scalable plastic-compatible processability and selective interface engineering enabled to demonstrate the flexible 74-leg PEDOT:PSS TEGs exhibiting the open-circuit voltage of 9.21 mV and the output power of 2.23 nW at a temperature difference of 10 K.
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Affiliation(s)
- Seongkwon Hwang
- Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology Seoul 02792, Republic of Korea
| | - Inho Jeong
- Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology Seoul 02792, Republic of Korea
- School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Juhyung Park
- Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center, Seoul National University, Seoul 08826, Republic of Korea
| | - Jae-Keun Kim
- Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 08826, Republic of Korea
| | - Heesuk Kim
- Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology Seoul 02792, Republic of Korea
| | - Takhee Lee
- Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 08826, Republic of Korea
| | - Jeonghun Kwak
- Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center, Seoul National University, Seoul 08826, Republic of Korea
| | - Seungjun Chung
- Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology Seoul 02792, Republic of Korea
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Nawar AM, Abd-Elsalam M, El-Mahalawy AM, El-Nahass MM. Analyzed electrical performance and induced interface passivation of fabricated Al/NTCDA/p-Si MIS–Schottky heterojunction. APPLIED PHYSICS A 2020; 126:113. [DOI: 10.1007/s00339-020-3289-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 01/03/2020] [Indexed: 09/01/2023]
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Anitha R, Menon SS, Bhalerao G, Siddham P, Baskar K, Singh S. Electrical properties of nitric acid and DMSO treated PEDOT:PSS/n‐Si hybrid heterostructures for optoelectronic applications. J Appl Polym Sci 2020. [DOI: 10.1002/app.48952] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- R. Anitha
- Crystal Growth CentreAnna University Chennai 600025 India
| | - Sumithra S. Menon
- Department of PhysicsSree Sankara College Kalady Kerala 683574 India
| | | | | | - K. Baskar
- Crystal Growth CentreAnna University Chennai 600025 India
| | - Shubra Singh
- Crystal Growth CentreAnna University Chennai 600025 India
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Marnadu R, Chandrasekaran J, Vivek P, Balasubramani V, Maruthamuthu S. Impact of Phase Transformation in WO3 Thin Films at Higher Temperature and its Compelling Interfacial Role in Cu/WO3/p–Si Structured Schottky Barrier Diodes. Z PHYS CHEM 2019. [DOI: 10.1515/zpch-2018-1289] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Inter-connected network grains of tungsten trioxide (WO3) thin films were deposited on glass using a jet nebulizer spray pyrolysis (JNSP) technique by varying the substrate temperature at 350, 400, 450 and 500 °C. Phase transformation (monoclinic to orthorhombic) was observed during the film growth through X-ray diffraction (XRD) analysis. Field emission scanning electron microscope (FE-SEM) images revealed a better grain growth with smooth surface for 400 °C. The WO3 film deposited at 400 °C exhibits minimum band gap and maximum optical conductivity of 3.2 eV and 5.8 × 1014 (Ω.cm)−1. From the current-voltage (I–V) characteristics, the mean electrical conductivity is found to increase gradually and the activation energy reduced at higher substrate temperature. Cu/WO3/p–Si structured Schottky barrier diodes (SBDs) have been fabricated with different substrate temperature and it was tested under variable device temperatures ranging from 30 to 170 °C. The experimental results of all SBDs indicated a linear reduction in the ideality factor (n) with a small increment in effective barrier height (Φ
B) with increase in device temperature, which is due to lateral inhomogeneity’s at the interface. Moreover, the minimum n value of 2.89 and their corresponding Φ
B of 0.71 eV were recorded for device temperature at 170 °C. Compared with other SBDs, the device fabricated at 400 °C demonstrated a better thermal stability and device performance.
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Affiliation(s)
- R. Marnadu
- Department of Physics , Sri Ramakrishna Mission Vidyalaya College of Arts and Science , Coimbatore 641 020, Tamil Nadu , India
| | - J. Chandrasekaran
- Department of Physics , Sri Ramakrishna Mission Vidyalaya College of Arts and Science , Coimbatore 641 020, Tamil Nadu , India , Tel.: +91-422-2692461, Fax: +91-422-2692676
| | - P. Vivek
- Department of Physics , Sri Ramakrishna Mission Vidyalaya College of Arts and Science , Coimbatore 641 020, Tamil Nadu , India
| | - V. Balasubramani
- Department of Physics , Sri Ramakrishna Mission Vidyalaya College of Arts and Science , Coimbatore 641 020, Tamil Nadu , India
| | - S. Maruthamuthu
- Department of Physics , Dr. Mahalingam College of Engineering and Technology , Pollachi 642 003, Tamil Nadu , India
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Reddy S, Xiao Q, Liu H, Li C, Chen S, Wang C, Chiu K, Chen N, Tu Y, Ramakrishna S, He L. Bionanotube/Poly(3,4-ethylenedioxythiophene) Nanohybrid as an Electrode for the Neural Interface and Dopamine Sensor. ACS APPLIED MATERIALS & INTERFACES 2019; 11:18254-18267. [PMID: 31034196 DOI: 10.1021/acsami.9b04862] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Poly(3,4-ethylene dioxythiophene) (PEDOT) is a promising conductive material widely used for interfacing with tissues in biomedical fields because of its unique properties. However, obtaining high charge injection capability and high stability remains challenging. In this study, pristine carbon nanotubes (CNTs) modified by dopamine (DA) self-polymerization on the surface polydopamine (PDA@CNTs) were utilized as dopants of PEDOT to prepare hybrid films through electrochemical deposition on the indium tin oxide (ITO) electrode. The PDA@CNTs-PEDOT film of the nanotube network topography exhibited excellent stability and strong adhesion to the ITO substrate compared with PEDOT and PEDOT/ p-toulene sulfonate. The PDA@CNTs-PEDOT-coated ITO electrodes demonstrated lower impedance and enhanced charge storage capacity than the bare ITO. When applying exogenous electrical stimulation (ES), robust long neurites sprouted from the dorsal root ganglion (DRG) neurons cultured on the PDA@CNTs-PEDOT film. Moreover, ES promoted Schwann cell migration out from the DRG spheres and enhanced myelination. The PDA@CNTs-PEDOT film served as an excellent electrochemical sensor for the detection of DA in the presence of biomolecule interferences. Results would shed light into the advancement of conducting nanohybrids for applications in the multifunctional bioelectrode in neuroscience.
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Affiliation(s)
- Sathish Reddy
- Guangdong-Hongkong-Macau Institute of CNS Regeneration (GHMICR), MOE Joint International Research Laboratory of CNS Regeneration , Jinan University , Guangzhou , Guangdong , 510632 , China
| | - Qiao Xiao
- College of Life Science and Technology , Jinan University , Guangzhou , Guangdong , 510632 , China
| | - Haiqian Liu
- Guangdong-Hongkong-Macau Institute of CNS Regeneration (GHMICR), MOE Joint International Research Laboratory of CNS Regeneration , Jinan University , Guangzhou , Guangdong , 510632 , China
| | - Chuping Li
- Guangdong-Hongkong-Macau Institute of CNS Regeneration (GHMICR), MOE Joint International Research Laboratory of CNS Regeneration , Jinan University , Guangzhou , Guangdong , 510632 , China
| | - Shengfeng Chen
- Guangdong-Hongkong-Macau Institute of CNS Regeneration (GHMICR), MOE Joint International Research Laboratory of CNS Regeneration , Jinan University , Guangzhou , Guangdong , 510632 , China
| | - Cong Wang
- Department of Traditional Therapy , The Second Clinical College of Guangzhou University of Chinese Medicine , Guangzhou 510120 , China
| | - Kin Chiu
- State Key Laboratory of Brain and Cognitive Sciences , The University of Hong Kong , Hong Kong SAR , P. R. China
| | - Nuan Chen
- Center for Nanofibers and Nanotechnology, Department of Mechanical Engineering, Faculty of Engineering , National University of Singapore , 117576 , Singapore
| | - Yujie Tu
- College of Life Science and Technology , Jinan University , Guangzhou , Guangdong , 510632 , China
| | - Seeram Ramakrishna
- Guangdong-Hongkong-Macau Institute of CNS Regeneration (GHMICR), MOE Joint International Research Laboratory of CNS Regeneration , Jinan University , Guangzhou , Guangdong , 510632 , China
- Center for Nanofibers and Nanotechnology, Department of Mechanical Engineering, Faculty of Engineering , National University of Singapore , 117576 , Singapore
| | - Liumin He
- Guangdong-Hongkong-Macau Institute of CNS Regeneration (GHMICR), MOE Joint International Research Laboratory of CNS Regeneration , Jinan University , Guangzhou , Guangdong , 510632 , China
- College of Life Science and Technology , Jinan University , Guangzhou , Guangdong , 510632 , China
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