1
|
Lungu I, Patru RE, Galca AC, Pintilie L, Potlog T. DC current-voltage and impedance spectroscopy characterization of nCdS/pZnTe HJ. Sci Rep 2024; 14:12955. [PMID: 38839911 PMCID: PMC11153606 DOI: 10.1038/s41598-024-63615-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Accepted: 05/30/2024] [Indexed: 06/07/2024] Open
Abstract
This paper describes the electrical and dielectric behavior of the nCdS/pZnTe HJ by current-voltage, capacitance-voltage characteristics, and impedance spectroscopy in a temperature interval 220-350 K. A microcrystalline p-ZnTe layer and n-CdS were grown on glass/ZnO substrate by closed space sublimation method. As frontal contact to CdS, the transparent ZnO and as a back contact to ZnTe, silver conductive paste (Ag) treated at 50 °C in vacuum were used. The current-voltage results of nCdS/pZnTe HJ show a rectifying behavior. The junction ideality factor, barrier height, and series resistance values were extracted from the rectifying curves at different temperatures. The built-in voltage, carrier concentration and depletion width were obtained from the capacitance-voltage measurements. Analysis of the J-V-T and C-V-T characteristics shows that the thermionic emission and recombination current flow mechanisms dominate in the nCdS/pZnTe HJ. The dielectric study reveals that the experimental values of the AC conductivity, dielectric constant, dielectric loss, the imaginary part of the electric modulus are found to be very sensitive to frequency and temperature. The dielectric constant and dielectric loss are observed to be high at the low frequency region. The increase in the values of electric modulus with the frequency implies an increase in the interfacial polarization at the interface of nCdS/pZnTe HJ. Jonscher's universal power law shows that with increasing frequency, AC conductivity increased. The results conductivity show that the ionic conductivity and interfacial polarization are the main parameters affecting the dielectric properties of the device when the temperature changes.
Collapse
Affiliation(s)
- I Lungu
- Laboratory of Organic/Inorganic Materials for Optoelectronics, Moldova State University, 2009, Chisinau, Republic of Moldova.
| | - R E Patru
- Complex Heterostructures and Multifunctional Materials Laboratory, National Institute of Materials Physics, 077125, Magurele, Ilfov, Romania
| | - A C Galca
- Complex Heterostructures and Multifunctional Materials Laboratory, National Institute of Materials Physics, 077125, Magurele, Ilfov, Romania
| | - L Pintilie
- Complex Heterostructures and Multifunctional Materials Laboratory, National Institute of Materials Physics, 077125, Magurele, Ilfov, Romania
| | - T Potlog
- Laboratory of Organic/Inorganic Materials for Optoelectronics, Moldova State University, 2009, Chisinau, Republic of Moldova
| |
Collapse
|
2
|
Kesavan AV, Lee BR, Son KR, Khot AC, Dongale TD, Murugadoss V, Ramamurthy PC, Kim TG. Work Function-Tunable Amorphous Carbon-Silver Nanocomposite Hybrid Electrode for Optoelectronic Applications. ACS APPLIED MATERIALS & INTERFACES 2021; 13:4284-4293. [PMID: 33433998 DOI: 10.1021/acsami.0c13937] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Parameters such as electrode work function (WF), optical reflectance, electrode morphology, and interface roughness play a crucial role in optoelectronic device design; therefore, fine-tuning these parameters is essential for efficient end-user applications. In this study, amorphous carbon-silver (C-Ag) nanocomposite hybrid electrodes are proposed and fully characterized for solar photovoltaic applications. Basically, the WF, sheet resistance, and optical reflectance of the C-Ag nanocomposite electrode are fine-tuned by varying the composition in a wide range. Experimental results suggest that irrespective of the variation in the graphite-silver composition, smaller and consistent grain size distributions offer uniform WF across the electrode surface. In addition, the strong C-Ag interaction in the nanocomposite enhances the nanomechanical properties of the hybrid electrode, such as hardness, reduced modulus, and elastic recovery parameters. Furthermore, the C-Ag nanocomposite hybrid electrode exhibits relatively lower surface roughness than the commercially available carbon paste electrode. These results suggest that the C-Ag nanocomposite electrode can be used for highly efficient photovoltaics in place of the conventional carbon-based electrodes.
Collapse
Affiliation(s)
- Arul Varman Kesavan
- School of Electrical Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Byeong Ryong Lee
- School of Electrical Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Kyung Rock Son
- School of Electrical Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Atul C Khot
- School of Electrical Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Tukaram D Dongale
- School of Electrical Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
- School of Nanoscience and Biotechnology, Shivaji University, Kolhapur 416 004, India
| | - Vignesh Murugadoss
- School of Electrical Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Praveen C Ramamurthy
- Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
| | - Tae Geun Kim
- School of Electrical Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| |
Collapse
|
3
|
Shivakumar R, Bolker A, Tsang SH, Atar N, Verker R, Gouzman I, Hala M, Moshe N, Jones A, Grossman E, Minton TK, Tong Teo EH. POSS enhanced 3D graphene - Polyimide film for atomic oxygen endurance in Low Earth Orbit space environment. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122270] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
4
|
Loeblein M, Bolker A, Tsang SH, Atar N, Uzan-Saguy C, Verker R, Gouzman I, Grossman E, Teo EHT. 3D Graphene-Infused Polyimide with Enhanced Electrothermal Performance for Long-Term Flexible Space Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:6425-6434. [PMID: 26479496 DOI: 10.1002/smll.201502670] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Indexed: 06/05/2023]
Abstract
Polyimides (PIs) have been praised for their high thermal stability, high modulus of elasticity and tensile strength, ease of fabrication, and moldability. They are currently the standard choice for both substrates for flexible electronics and space shielding, as they render high temperature and UV stability and toughness. However, their poor thermal conductivity and completely electrically insulating characteristics have caused other limitations, such as thermal management challenges for flexible high-power electronics and spacecraft electrostatic charging. In order to target these issues, a hybrid of PI with 3D-graphene (3D-C), 3D-C/PI, is developed here. This composite renders extraordinary enhancements of thermal conductivity (one order of magnitude) and electrical conductivity (10 orders of magnitude). It withstands and keeps a stable performance throughout various bending and thermal cycles, as well as the oxidative and aggressive environment of ground-based, simulated space environments. This makes this new hybrid film a suitable material for flexible space applications.
Collapse
Affiliation(s)
- Manuela Loeblein
- School of Electrical and Electronic Engineering, Nanyang Technological University, Block S1, 50 Nanyang Avenue, 639798, Singapore
- CNRS International NTU Thales Research Alliance (CINTRA), 50 Nanyang Avenue, 639798, Singapore
| | - Asaf Bolker
- Space Environment Section, Soreq NRC, Yavne, 81800, Israel
| | - Siu Hon Tsang
- Temasek Laboratories@NTU, 50 Nanyang Avenue, 639798, Singapore
| | - Nurit Atar
- Space Environment Section, Soreq NRC, Yavne, 81800, Israel
| | - Cecile Uzan-Saguy
- Solid State Institute, Technion - Israel Institute of Technology, Technion City, Haifa, 3200003, Israel
| | - Ronen Verker
- Space Environment Section, Soreq NRC, Yavne, 81800, Israel
| | - Irina Gouzman
- Space Environment Section, Soreq NRC, Yavne, 81800, Israel
| | - Eitan Grossman
- Space Environment Section, Soreq NRC, Yavne, 81800, Israel
| | - Edwin Hang Tong Teo
- School of Electrical and Electronic Engineering, Nanyang Technological University, Block S1, 50 Nanyang Avenue, 639798, Singapore
| |
Collapse
|
5
|
Lagrini A, Deslouis C, Cachet H, Benlahsen M, Charvet S. Elaboration and electrochemical characterization of nitrogenated amorphous carbon films. Electrochem commun 2004. [DOI: 10.1016/j.elecom.2003.12.009] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
|