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5. Modulating thermoelectric properties in oxygen-passivated Sb2Te3 thin film through grain boundary engineering

Author

Ghosh, Abhishek, Vishwakarma, Chandan Kumar, Bisht, Prashant, Kaur, Narinder, Ahmad, Mujeeb, and Mehta, Bodh Raj

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The present study demonstrates the effectiveness of incorporating oxygen atoms into the Sb2Te3 thin film, leading to an improved power factor and reduction in thermal conductivity. Based on the experimental evidence, it can be inferred that oxygen-related impurities preferentially wet the grain boundary (GB) and introduce a double Schottky barrier at the GB interface, promoting energy-dependent carrier scattering, ultimately leading to a rise in the Seebeck coefficient. Additionally, the introduction of chemisorbed oxygen creates a high mobility state within the valence band of Sb2Te3, as corroborated by theoretical calculations, resulting in a significantly increased electrical mobility. These factors collectively contribute to improved thermoelectric performance. A set of Scanning probe (SPM) techniques is used to experimentally confirm the alteration in charge transport resulting from the oxygen-passivated grain boundary. Additionally, Scanning Thermal Microscopy (SThM) is employed to observe the spatial variations of thermal conductivity at the nanoscale regime. This study presents a comprehensive microscopic investigation of the impact of oxygen on the phonon and charge carrier transport characteristics of Sb2Te3 thermoelectric materials and indicates that incorporating oxygen may represent a feasible approach to improve the thermoelectric efficiency of these materials.

Published
2023

8. Tuning thermoelectric properties of Sb$_2$Te$_3$-AgSbTe$_2$ nanocomposite thin film -- synergy of band engineering and heat transport modulation

Author

Ghosh, Abhishek, Agarwal, Khushboo, Munoz, Sergio Gonzalez, Bisht, Prashant, Vishwakarma, Chandan K, Kaur, Narinder, Ahmad, Mujeeb, Vullum, Per Erik, Belle, Branson D., Singh, Rajendra, Kolosov, O. V., and Mehta, Bodh Raj

Subjects
Condensed Matter - Materials Science
Abstract

The present study demonstrates a large enhancement in the Seebeck coefficient and ultralow thermal conductivity (TE) in Sb$_2$Te$_3$-AgSbTe$_2$ nanocomposite thin film. The addition of Ag leads to the in-situ formation of AgSbTe$_2$ secondary phase nanoaggregates in the Sb$_2$Te$_3$ matrix during the growth resulting in a large Seebeck coefficient and reduction of the thermal conductivity. A series of samples with different amounts of minor AgSbTe$_2$ phases are prepared to optimize the TE performance of Sb$_2$Te$_3$ thin films. Based on the experimental and theoretical evidence, it is concluded that a small concentration of Ag promotes the band flattening and induces a sharp resonate-like state deep inside the valence band of Sb$_2$Te$_3$, concurrently modifying the density of states (DOS) of the composite sample. In addition, the electrical potential barrier introduced by the band offset between the host TE matrix and the secondary phases promotes strong energy-dependent carrier scattering in the composite sample, which is also responsible for enhanced TE performance. A contemporary approach based on scanning thermal microscopy is performed to experimentally obtain thermal conductivity values of both the in-plane and cross-plane directions, showing a reduced in-plane thermal conductivity value by ~ 58% upon incorporating the AgSbTe$_2$ phase in the Sb$_2$Te$_3$ matrix. Benefitting from the synergistic manipulation of electrical and thermal transport, a large ZT value of 2.2 is achieved at 375 K. The present study indicates the importance of a combined effect of band structure modification and energy-dependent charge carrier scattering along with reduced thermal conductivity for enhancing TE properties.

Published
2023

22. Climate Dependent Crop Field Condition Management Through Data Modeling

Author

Kaur, Narinder, Gupta, Vishal, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Khanna, Ashish, editor, Gupta, Deepak, editor, Kansal, Vineet, editor, Fortino, Giancarlo, editor, and Hassanien, Aboul Ella, editor

Published
2023
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23. Deep Learning Based Hand Sign Recognition in the Context of Indian Greetings and Gestures

Author

Saxena, Rohan, Garg, Romy, Gupta, Bhoomi, Kaur, Narinder, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Joby, P. P., editor, Balas, Valentina E., editor, and Palanisamy, Ram, editor

Published
2023
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36. The effect of cholecystectomy for symptomatic gall stone disease on hepatic steatosis using transabdominal ultrasonography: An observational prospective study.

Author

Dhakaria, Umang, Bansiwal, Rajesh Kumar, Khemchand, Agrawal Kavita, Sharma, Rajeev, Singh, Mandeep, Kaur, Narinder, and Gupta, Seema

Abstract

Copyright of Turkish Journal of Surgery / Bilimsel Tip Yayinevi is the property of Bilimsel Tip Yayinevi and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024
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45. Correlation Between Vitamin D Status And Allergies In Children Of 2 To 10 Years Of Age.

Author

Shyamali, Gupta, Mridu, Kaur, Narinder, Kaur, Manmeet, and Gupta, Sangeeta

Subjects
ENZYME-linked immunosorbent assay, DAY care centers, VITAMIN D, AGE groups, ALLERGIES
Abstract

AIM: Determine the vitamin D levels in children of already diagnosed case of allergies in age group of 2 to 10 years. • To determine the correlation between vitamin D status and allergies in children of age group of 2 to 10years. Materials & Method: It is a crosssectional study. The subjects were recruited from BEBE NANKI MOTHER & Child Care Center attached to government medical college Amritsar. 200 subjects in age group of 2 to 10 years diagnosed with allergies were included. Patients with age group less than 2years & more than 10years& those on drugs like rifampicin, isoniazid, ketoconazole were excluded from study. 25-hydroxy vitamin D (25{OH}D) was analysed from enzyme linked immunoassay in human serum or plasma. Informed written consent was obtained from the subjects from the institution before commencing the study. The results were analysed statistically using student “t” test. Results: All the data is expressed as mean ±SD The ‘Pvalue was evaluated which suggested a negative association between vitamin D status and Allergies in children. Conclusion: The present study suggested that there is negative association between vitamin D status and allergies [ABSTRACT FROM AUTHOR]

Published
2024

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