Bismuth telluride based efficient thermoelectric power generator with electrically conducive interfaces for harvesting low-temperature heat

Bhatt, Ranu; Kumar, Rishikesh; Bhattacharya, Shovit; Bhatt, Pramod; Patro, P.K.; Dasgupta, Titas; Singh, Ajay; Muthe, K.P.

doi:10.1016/j.jsamd.2022.100447

Cited by 4 publications

(1 citation statement)

References 25 publications

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“…Bi 2 (Te,Se) 3 compounds possess excellent thermal stability until ∼573 K. 43 Bi 1.5 Sb 0.5 Te 3 − Bi 2 Te 2.7 Se 0.3 devices with similar contact layers reported longterm thermal stability until 573 K hot-side temperature. 44 From the thermal profile projection at ΔT ≈ 313 K, the optimum segment length ratio should be ∼0.51, which restricts T i ≈ 573 K. In our experimental work, the actual length ratio was 0.49 (considering the interface layers), which leads to T i ≈ 572 K at ΔT ≈ 313 K, and this interface temperature T i is within the stability range of Bi 2 Te 2.7 Se 0.3 . A segment length ratio beyond the stability range can lead to failure of the TEG element during long-term service.…”

Section: Predictions Of Interfacementioning

confidence: 99%

A Constant Properties Model for the Performance Estimation in Segmented Thermoelectric Generator Elements and Its Experimental Validation Using an n-Type Mg₂Si_0.3Sn_0.7–Bi₂Te_2.7Se_0.3 Segmented Leg

Jayachandran

Dasgupta

Singh

2023

ACS Appl. Energy Mater.

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Segmenting multiple compatible thermoelectric (TE) materials can improve the conversion efficiency in thermoelectric generators (TEGs) compared to single-material TEGs. A model to accurately estimate the performance in segmented TEGs is essential for optimizing the geometric parameters. Constant properties models (CPMs) help in the quick estimation of the performance of TEGs working under large temperature differences using averaged material properties. This work discusses a CPM to predict the performance of single and segmented TEG elements using a combination of temperature-averaged and spatially-averaged TE properties. Spatial averaging requires the knowledge of the temperature profile across the TEG element length, which was obtained by solving the heat balance equation with a numerical integration approach as suggested by Ponnusamy et al. In this work, we develop the CPM for the segmented TEG elements (CPMS). The model predictions were validated experimentally from the performance evaluation of single Mg 2 (Si 0.3 Sn 0.7 ) 0.98 Bi 0.02 and segmented Mg 2 (Si 0.3 Sn 0.7 ) 0.98 Bi 0.02 − Bi 2 (Te 2.7 Se 0.3 ) 0.98 (CuI) 0.02 TEG elements. Single and segmented TEG elements with Cu contacts were prepared by a hot-pressing technique. Both Mg 2 (Si 0.3 Sn 0.7 ) 0.98 Bi 0.02 and Bi 2 (Te 2.7 Se 0.3 ) 0.98 (CuI) 0.02 TE materials show peak zT > 1 in their measurement range. The experimental results show a maximum efficiency (η max ) of ∼8.25% with 18% improvement for the segmented structure at ΔT ≈ 302 K. The improvement mainly originated from lower heat input (Q in ) even though the maximum power output (P max ) became lower by ∼30%. The performance prediction using the CPM matches well with <10% error for P max and η max for the single TEG element, and using the CPMS, the predictions were <10% error for P max and <25% error for η max for the segmented TEG element experimental results. This work demonstrates how CPMS can be used to predict device performance characteristics in segmented TEGs.

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Section: Predictions Of Interfacementioning

confidence: 99%

A Constant Properties Model for the Performance Estimation in Segmented Thermoelectric Generator Elements and Its Experimental Validation Using an n-Type Mg₂Si_0.3Sn_0.7–Bi₂Te_2.7Se_0.3 Segmented Leg

Jayachandran

Dasgupta

Singh

2023

ACS Appl. Energy Mater.

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Trends in GeTe Thermoelectrics: From Fundamentals to Applications

Li,

Shi,

Chen

2024

Adv Funct Materials

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Germanium telluride (GeTe) with ultrafast ferroelectric transition, Rashba‐like electronic transport, and anomalous phonon anharmonicity are historically studied for potential memorizing and thermoelectric applications. Due to recent breakthroughs in spintronics, valleytronics, orbitronics, pre‐eminent GeTe thermoelectrics have re‐attracted enormous interest from both academia and industries, with increasing reports of significant figure‐of‐merit over 2.7 and the maximum efficiency of up to 17.0%. Here, the emerging trends in advancing GeTe thermoelectrics, starting from fundamentals of phase transformation, crystal structure, bonding mechanisms, and transport characteristics, with a highlight on the roles of Ge_4s2 lone pairs, are timely overviewed. Technical insights in synthesis, characterization, property measurement, and computation are then summarized. After that, several innovative strategies for increasing the figure‐of‐merit, including entropy engineering, nanostructuring, and hybridization, which will further benefit near‐room‐temperature and n‐type performance, are examined. Moreover, high‐density and high‐efficiency devices with broad working temperatures are discussed as a result of rational configurational and interfacial design. In the end, perspective remarks on the challenges and outlook envisaging for next‐generation GeTe thermoelectrics, which will play a prominent role in future energy and environmental landscapes, are provided.

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The effect of powder synthesis method on thermoelectric properties of Bi2Te2.7Se0.3 thin films

Saberi

Sajjadi

Mansouri

2023

J Mater Sci: Mater Electron

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Bismuth telluride based efficient thermoelectric power generator with electrically conducive interfaces for harvesting low-temperature heat

Cited by 4 publications

References 25 publications

A Constant Properties Model for the Performance Estimation in Segmented Thermoelectric Generator Elements and Its Experimental Validation Using an n-Type Mg₂Si_0.3Sn_0.7–Bi₂Te_2.7Se_0.3 Segmented Leg

A Constant Properties Model for the Performance Estimation in Segmented Thermoelectric Generator Elements and Its Experimental Validation Using an n-Type Mg₂Si_0.3Sn_0.7–Bi₂Te_2.7Se_0.3 Segmented Leg

Trends in GeTe Thermoelectrics: From Fundamentals to Applications

The effect of powder synthesis method on thermoelectric properties of Bi2Te2.7Se0.3 thin films

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Bismuth telluride based efficient thermoelectric power generator with electrically conducive interfaces for harvesting low-temperature heat

Cited by 4 publications

References 25 publications

A Constant Properties Model for the Performance Estimation in Segmented Thermoelectric Generator Elements and Its Experimental Validation Using an n-Type Mg2Si0.3Sn0.7–Bi2Te2.7Se0.3 Segmented Leg

A Constant Properties Model for the Performance Estimation in Segmented Thermoelectric Generator Elements and Its Experimental Validation Using an n-Type Mg2Si0.3Sn0.7–Bi2Te2.7Se0.3 Segmented Leg

Trends in GeTe Thermoelectrics: From Fundamentals to Applications

The effect of powder synthesis method on thermoelectric properties of Bi2Te2.7Se0.3 thin films

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Product

Resources

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A Constant Properties Model for the Performance Estimation in Segmented Thermoelectric Generator Elements and Its Experimental Validation Using an n-Type Mg₂Si_0.3Sn_0.7–Bi₂Te_2.7Se_0.3 Segmented Leg

A Constant Properties Model for the Performance Estimation in Segmented Thermoelectric Generator Elements and Its Experimental Validation Using an n-Type Mg₂Si_0.3Sn_0.7–Bi₂Te_2.7Se_0.3 Segmented Leg