scholarly journals Staircase Quantum Dots Configuration in Nanowires for Optimized Thermoelectric Power

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Lijie Li ◽  
Jian-Hua Jiang
Keyword(s):  
Quantum Dots ◽  
Output Power ◽  
High Efficiency ◽  
Fixed Number ◽  
Transport Processes ◽  
Thermoelectric Device ◽  
Single Pair ◽  
Thermoelectric Devices ◽  
Serial Connection ◽  
Inelastic Transport

Abstract The performance of thermoelectric energy harvesters can be improved by nanostructures that exploit inelastic transport processes. One prototype is the three-terminal hopping thermoelectric device where electron hopping between quantum-dots are driven by hot phonons. Such three-terminal hopping thermoelectric devices have potential in achieving high efficiency or power via inelastic transport and without relying on heavy-elements or toxic compounds. We show in this work how output power of the device can be optimized via tuning the number and energy configuration of the quantum-dots embedded in parallel nanowires. We find that the staircase energy configuration with constant energy-step can improve the power factor over a serial connection of a single pair of quantum-dots. Moreover, for a fixed energy-step, there is an optimal length for the nanowire. Similarly for a fixed number of quantum-dots there is an optimal energy-step for the output power. Our results are important for future developments of high-performance nanostructured thermoelectric devices.

FLUCTUATIONS IN INELASTIC TUNNELING OF ELECTRONS THROUGH SERIALLY COUPLED DOUBLE QUANTUM DOTS

2008 ◽  
Vol 22 (27) ◽  
pp. 4899-4907
Author(s):  
QINGQIANG XU ◽  
SHI-JIE XIONG
Keyword(s):  
Quantum Dots ◽  
Transport Processes ◽  
Double Quantum ◽  
Multichannel Scattering ◽  
Many Body ◽  
Electron Phonon Interaction ◽  
Double Quantum Dots ◽  
Full Counting Statistics ◽  
Inelastic Transport ◽  
Counting Statistics

We investigate the inelastic transport properties of quantum dots connected to two leads, based on the combination of a recently developed nonperturbative technique and full counting statistics involving an approximate mapping of a many-body electron–phonon system onto a multichannel scattering system. The full counting statistics is adopted in the calculations of the inelastic transport processes of electrons where the electron–phonon interactions, which are the main source of the inelasticity, are taken into account. For serially coupled double quantum dots, we find that (i) both the current and the noise are suppressed when electron–phonon interaction switches on, and (ii) skewness becomes negative in a certain parameter regime, which is absent in the case without electron–phonon interactions.

Computer-aided design of high-efficiency GeTe-based thermoelectric devices

2020 ◽  
Vol 13 (6) ◽  
pp. 1856-1864 ◽  
Author(s):  
Min Hong ◽  
Kun Zheng ◽  
Wanyu Lyv ◽  
Meng Li ◽  
Xianlin Qu ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Computer Aided Design ◽  
High Efficiency ◽  
Geometry Optimization ◽  
Thermoelectric Performance ◽  
Thermoelectric Device ◽  
Thermoelectric Devices ◽  
High Conversion Efficiency ◽  
Computer Aided ◽  
Aided Design

Enhanced thermoelectric performance by band convergence and superlattice precipitates combined with geometry optimization by computer-aided design produced a segmented thermoelectric device with a record-high conversion efficiency.

Monodisperse Perovskite Colloidal Quantum Dots Enable High-Efficiency Photovoltaics

2021 ◽  
pp. 2229-2237
Author(s):  
Seyeong Lim ◽  
Gyudong Lee ◽  
Sanghun Han ◽  
Jigeon Kim ◽  
Sunhee Yun ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Efficiency ◽  
Colloidal Quantum Dots

Zn-doped Cu2S quantum dots as new high-efficiency inhibitors against human insulin fibrillation based on specific electrostatic interaction with oligomers

2021 ◽  
Vol 179 ◽  
pp. 161-169
Author(s):  
Shu-Lan Li ◽  
Qi-Qi Yang ◽  
Xing-Yu Liu ◽  
Feng-Lei Jiang ◽  
Jiaqiang Xiong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Human Insulin ◽  
Electrostatic Interaction ◽  
High Efficiency

High efficiency transport of quantum dots into plant roots with the aid of silwet L-77

2010 ◽  
Vol 48 (8) ◽  
pp. 703-709 ◽  
Author(s):  
Yong Hu ◽  
Jun Li ◽  
Lu Ma ◽  
Qionglin Peng ◽  
Wei Feng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Efficiency ◽  
Plant Roots

An Experimental Method for Fast Evaluating Thermoelectric Generators Using one pair of P- and N-type Legs

2021 ◽  
pp. 1-12
Author(s):  
Ting Zhao ◽  
Kewen Li ◽  
Yuhao Zhu ◽  
Lin Jia ◽  
Xiaoyong Hou ◽  
...  
Keyword(s):  
Experimental Method ◽  
Output Power ◽  
Temperature Difference ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Experimental Results ◽  
Single Pair ◽  
Thermoelectric Generators ◽  
Cross Sectional ◽  
Specific Temperature

Abstract Thermoelectric generators (TEG) are widely used in many industries. The voltage and output power of TEG chips are critical indicators to evaluate the performance of TEGs. The conventional method is to directly test the output voltage and power of the whole TEG chip that contains 127 pairs of PN (P- and N-type) legs (127-PN-TEG). However, the assembling of these PN legs is very time-consuming. In order to reduce experimental time and the consumption of TEG materials, we proposed an experimental method. We developed the test apparatus for the rapid evaluation of TEG performance using a TEG chip with a single pair of PN legs (1-PN-TEG). We made several 1-PN-TEGs and 127-PN-TEGs using the same thermoelectric material (bismuth telluride). We then measured the voltage and the power of these 1-PN-TEGs and 127-PN-TEGs, respectively. The experimental results were compared and analyzed. The comparison showed that the voltage of 127-PN-TEG is equal to the voltage of 1-PN-TEG times 127, which implies that we could use the test data of 1-PN-TEG to evaluate the performance of 127-PN-TEG. Using the experimental device developed in this paper, we also studied the effects of the PN leg area (cross-sectional area of PN legs) and the pressure applied over the TEGs on the output power of 1-PN-TEG. The experimental results showed that the power per unit area decreases with an increase in the 1-PN-TEG's PN leg area when the temperature difference between the hot and cold sides was constant. Under a specific temperature difference conditions, the open-circuit voltage and the output power will increase with the pressure applied on the TEG chips.

A Layer-by-Layer Growth Strategy for Large-Size InP/ZnSe/ZnS Core–Shell Quantum Dots Enabling High-Efficiency Light-Emitting Diodes

2018 ◽  
Vol 30 (21) ◽  
pp. 8002-8007 ◽  
Author(s):  
Fan Cao ◽  
Sheng Wang ◽  
Feijiu Wang ◽  
Qianqian Wu ◽  
Dewei Zhao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Layer Growth ◽  
Growth Strategy ◽  
Core Shell ◽  
Layer By Layer ◽  
Light Emitting ◽  
Large Size
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