Enhancement of optical and thermoelectric properties in dysprosium doped ZnO thin films as an impact of non-parabolic band structure

Paulson, Anju; Sabeer, N.A. Muhammed; Pradyumnan, P. P.

doi:10.1016/j.mseb.2020.114745

Cited by 17 publications

(6 citation statements)

References 29 publications

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“…Moreover, using the van der Pauw method, the electrical conductivity of 1.2 × 10 4 and 5.6 × 10 2 S/m for the ZnO and SnO x films was determined, which results in a power factor of 180 ± 0.6 and 37 ± 2.8 μW/m K 2 , respectively. Our ZnO power factor is higher than other ones reported for dense ZnO films, for example <35 μW/m K 2 for undoped and Dy-doped ZnO films and ∼9 μW/m K 2 for nanowire-structured ZnO films (∼200 nm thick) . Moreover, our ZnO film shows a similar power factor at 298 K when compared with Al 2 O 3 /ZnO superlattices reported by Park et al .…”

Section: Resultssupporting

confidence: 53%

All-Oxide p–n Junction Thermoelectric Generator Based on SnO_x and ZnO Thin Films

Vieira

Silva

Veltruská

et al. 2021

ACS Appl. Mater. Interfaces

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Achieving thermoelectric devices with high performance based on low-cost and nontoxic materials is extremely challenging. Moreover, as we move toward an Internet-of-Things society, a miniaturized local power source such as a thermoelectric generator (TEG) is desired to power increasing numbers of wireless sensors. Therefore, in this work, an all-oxide p–n junction TEG composed of low-cost, abundant, and nontoxic materials, such as n-type ZnO and p-type SnO x thin films, deposited on borosilicate glass substrate is proposed. A type II heterojunction between SnO x and ZnO films was predicted by density functional theory (DFT) calculations and confirmed experimentally by X-ray photoelectron spectroscopy (XPS). Moreover, scanning transmission electron microscopy (STEM) combined with energy-dispersive X-ray spectroscopy (EDS) show a sharp interface between the SnO x and ZnO layers, confirming the high quality of the p–n junction even after annealing at 523 K. ZnO and SnO x thin films exhibit Seebeck coefficients (α) of ∼121 and ∼258 μV/K, respectively, at 298 K, resulting in power factors (PF) of 180 μW/m K2 (for ZnO) and 37 μW/m K2 (for SnO x ). Moreover, the thermal conductivities of ZnO and SnO x films are 8.7 and 1.24 W/m K, respectively, at 298 K, with no significant changes until 575 K. The four pairs all-oxide TEG generated a maximum power output (P out) of 1.8 nW (≈126 μW/cm2) at a temperature difference of 160 K. The output voltage (V out) and output current (I out) at the maximum power output of the TEG are 124 mV and 0.0146 μA, respectively. This work paves the way for achieving a high-performance TEG device based on oxide thin films.

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Section: Resultssupporting

confidence: 53%

All-Oxide p–n Junction Thermoelectric Generator Based on SnO_x and ZnO Thin Films

Vieira

Silva

Veltruská

et al. 2021

ACS Appl. Mater. Interfaces

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“…In addition, La doping introduced the band flattening effect, which showed an extremely high conductivity value of 33.131 Sm −1 and power factor 1156 µWm −1 K −2 for Cu 3 Sb 0.92 Sn 0.02 La 0.06 Se 4 at 623 K as shown in [311]. Band flattening is one of the key factors for inducing non-parabolic features in band structures and is caused by the larger effective mass across the conduction band edge [312]. The defects created by the Ge vacancies showed an enhanced zT value of 1.62 for Ge 0.8 Pb 0.1 Bi 0.1 Te 1.06 because of the combined effect from band convergence and suppressed bipolar effect [313].…”

Section: Electronic Structure/ Band Engineering (Band Convergence Val...mentioning

confidence: 99%

Physics and technology of thermoelectric materials and devices

Dadhich

Saminathan

Kumari

et al. 2023

J. Phys. D: Appl. Phys.

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The continuous depletion of fossil fuels and the increasing demand for eco-friendly and sustainable energy sources have prompted researchers to look for alternative energy sources. The loss of thermal energy in heat engines (100-350 ºC), coal-based thermal plants (150-700 ºC), heated water pumping in the geothermal process (150-700 ºC), and burning of petrol in the automobiles (150-250 ºC) in form of untapped waste-heat can be directly and/or reversibly converted into usable electricity by means of charge carriers (electrons or holes) as moving fluids using thermoelectric (TE) technology, which works based on typical Seebeck effect. The enhancement in TE conversion efficiency has been a key challenge because of the coupled relation between thermal and electrical transport of charge carriers in a given material. In this review, we have deliberated the physical concepts governing the materials to device performance as well as key challenges for enhancing the TE performance. Moreover, the role of crystal structure in the form of chemical bonding, crystal symmetry, order-disorder and phase transition on charge carrier transport in the material has been explored. Further, this review has also emphasized some insights on various approaches employed recently to improve the TE performance, such as, (i). carrier engineering via band engineering, low dimensional effects, and energy filtering effects and (ii). Phonon engineering via doping/alloying, nano-structuring, embedding secondary phases in the matrix and microstructural engineering. Wehave also briefed the importance of magnetic elements on thermoelectric properties of the selected materials and spin Seebeck effect. Furthermore, the design and fabrication of TE modules and their major challenges are also discussed. As, thermoelectric figure of merit, zT does not have any theoretical limitation, an ideal high performance thermoelectric device should consist of low-cost, eco-friendly, efficient, n- or p-type materials that operate at wide- temperature range and similar coefficients of thermal expansion, suitable contact materials, less electrical/ thermal losses and constant source of thermal energy. Overall, this review provides the recent physical concepts adopted and fabrication procedures of TE materials and device so as to improve the fundamental understanding and to develop a promising TE device.

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“…Ideal TE materials should possess high S and 𝜎 but low k. Nevertheless, S, 𝜎, and k are not independent, which are correlated with carrier concentration, carrier mobility, and band structure. [25] For the majority of TE materials, 𝜎 and k are positively correlated whereas S and 𝜎 are inversely correlated. The maximum zT can be achieved by the trade-off between S, 𝜎, and k. [26]…”

Section: Thermoelectric Figure Of Meritmentioning

confidence: 99%

Advanced Thermoelectric Textiles for Power Generation: Principles, Design, and Manufacturing

Chen,

Yang,

Han

et al. 2023

Global Challenges

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Self‐powered wearable thermoelectric (TE) devices significantly reduce the inconvenience caused to users, especially in daily use of portable devices and monitoring personal health. The textile‐based TE devices (TETs) exhibit the excellent flexibility, deformability, and light weight, which fulfill demands of long‐term wearing for the human body. In comparison to traditional TE devices with their longstanding research history, TETs are still in an initial stage of growth. In recent years, TETs to provide electricity for low‐power wearable electronics have attracted increasing attention. This review summarizes the recent progress of TETs from the points of selecting TE materials, scalable fabrication methods of TE fibers/yarns and TETs, structure design of TETs and reported high‐performance TETs. The key points to develop TETs with outstanding TE properties and mechanical performance and better than available optimization strategies are discussed. Furthermore, remaining challenges and perspectives of TETs are also proposed to suggest practical applications for heat harvesting from human body.

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Enhancement of optical and thermoelectric properties in dysprosium doped ZnO thin films as an impact of non-parabolic band structure

Cited by 17 publications

References 29 publications

All-Oxide p–n Junction Thermoelectric Generator Based on SnO_x and ZnO Thin Films

All-Oxide p–n Junction Thermoelectric Generator Based on SnO_x and ZnO Thin Films

Physics and technology of thermoelectric materials and devices

Advanced Thermoelectric Textiles for Power Generation: Principles, Design, and Manufacturing

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Enhancement of optical and thermoelectric properties in dysprosium doped ZnO thin films as an impact of non-parabolic band structure

Cited by 17 publications

References 29 publications

All-Oxide p–n Junction Thermoelectric Generator Based on SnOx and ZnO Thin Films

All-Oxide p–n Junction Thermoelectric Generator Based on SnOx and ZnO Thin Films

Physics and technology of thermoelectric materials and devices

Advanced Thermoelectric Textiles for Power Generation: Principles, Design, and Manufacturing

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Product

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All-Oxide p–n Junction Thermoelectric Generator Based on SnO_x and ZnO Thin Films

All-Oxide p–n Junction Thermoelectric Generator Based on SnO_x and ZnO Thin Films