Probing photocarrier dynamics in a Bi2Te3–Te eutectic p–n junction with a laser terahertz emission microscope

Author:

Murakami Fumikazu1ORCID,Serita Kazunori1ORCID,Kawayama Iwao12,Murakami Hironaru1ORCID,Bandopadhyay Kingshuk3ORCID,Materna Andrzej34,Urbas Augustine M.5,Pawlak Dorota A.346,Tonouchi Masayoshi1ORCID

Affiliation:

1. Institute of Laser Engineering, Osaka University 1 , 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan

2. Graduate School of Energy Science, Kyoto University 2 , Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan

3. ENSEMBLE3 Sp. z o. o. Centre of Excellence 3 , Wólczyńska 133, Warsaw 01-919, Poland

4. Łukasiewicz–Institute of Microelectronics and Photonics 4 , Al. Lotników 32/46, Warsaw 02-668, Poland

5. Materials and Manufacturing Directorate, Air Force Research Laboratory 5 , 2275 D Street, Wright-Patterson Air Force Base, Ohio 45433-5540, USA

6. Chemistry Department University of Warsaw 6 , ul. Pasteura 1, Warsaw 02-093, Poland

Abstract

Bismuth telluride (Bi2Te3)-based heterostructures have attracted considerable attention owing to their interesting anisotropic properties and expected higher thermoelectric performance. Therefore, exploring the nature of the carrier dynamics in these heterostructures has been an important subject in the design and optimization of advanced materials. In the present study, hot carrier injection and its subsequent spatiotemporal behavior in a multilayered crystalline Bi2Te3–Tellurium (Te) eutectic composite were studied using a laser terahertz (THz) emission microscopy (LTEM). The THz emission electric fields at the Bi2Te3–Te interface were polarized perpendicular to the interface. The polarities of these waveforms reveal the direction of the electric field between the Bi2Te3 and Te regions, indicating the carrier types of these components and the p–n junction formed at the interface. In addition, in the Te region, a strong THz emission with an electric field polarized parallel to the interface was observed. This unique THz emission can be qualitatively explained through hot photocarrier anisotropic transport by considering the effective mass of electrons and holes. LTEM clarified the local carrier dynamics in the microstructures and revealed the potential distribution and anisotropic transport properties. These findings contribute to the exploration of eutectic heterostructures as new functional materials and provide new avenues for cutting-edge thermoelectric and photovoltaic devices.

Funder

Japan Society for the Promotion of Science

Osaka University

Japan Science and Technology Agency

Core Research for Evolutional Science and Technology

European Union under the European Regional Development Fund and Teaming Horizon 2020 program of the European Commission

National Scienece Sentre

Publisher

AIP Publishing

Subject

General Engineering,General Materials Science

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