Gate‐Tunable Polar Optical Phonon to Piezoelectric Scattering in Few‐Layer Bi2O2Se for High‐Performance Thermoelectrics
Source abstract
Abstract
Abstract Atomically thin Bi2O2Se has emerged as a new member in 2D materials with ultrahigh carrier mobility and excellent air‐stability, showing great potential for electronics and optoelectronics. In addition, its ferroelectric nature renders an ultralow thermal conductivity, making it a perfect candidate for thermoelectrics. In this work, the thermoelectric performance of 2D Bi2O2Se is investigated over a wide temperature range (20–300 K). A gate‐tunable transition from polar optical phonon (POP) scattering to piezoelectric scattering is observed, which facilitates the capacity of drastic mobility engineering in 2D Bi2O2Se. Consequently, a high power factor of more than 400 µW m−1 K−2 over an unprecedented temperature range (80–200 K) is achieved, corresponding to the persistently high mobility arising from the highly gate‐tunable scattering mechanism. This finding provides a new avenue for maximizing thermoelectric performance by changing the scattering mechanism and carrier mobility over a wide temperature range.
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Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · 2D Materials and Applications · Topological Materials and Phenomena
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast University Nanjing 211189 China
Institute of Materials Research and Engineering Agency for Science Technology and Research Singapore 138634 Singapore
NNU‐SULI Thermal Energy Research Center (NSTER) & Center for Quantum Transport and Thermal Energy Science (CQTES) School of Physics and Technology Nanjing Normal University Nanjing 210023 China
Department of Materials Science and Engineering Nanyang Technological University Technology and Research 50 Nanyang Avenue Singapore 639798 Singapore
Funding
National Natural Science Foundation of China · Natural Science Foundation of Jiangsu Province · Fundamental Research Funds for the Central Universities · Science and Engineering Research Council
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