Details

Autor(en) / Beteiligte

• Fukuda, Takumi
• Kaburauchi, Ryota
• Saito, Yuta
• Makino, Kotaro
• Fons, Paul
• Ueno, Keiji
• Hase, Muneaki

Titel

Photo‐Induced Tellurium Segregation in MoTe2

Ist Teil von

• Physica status solidi. PSS-RRL. Rapid research letters, 2022-09, Vol.16 (9), p.n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2022

Quelle

Wiley Online Library

Beschreibungen/Notizen

• Herein, coherent phonon spectroscopy of polymorphic MoTe 2 single crystals using a femtosecond‐pulsed laser is used to investigate the relationship between structural phase transitions and photo‐thermal effects induced by high‐density laser excitation. Even when a femtosecond‐pulsed laser is used, which generally induces fewer heat accumulation effects than the case for a continuous‐wave (CW) laser, tellurium segregation is observed in coherent phonon spectra with increasing excitation density, while no structural phase transition among the polymorphs of MoTe 2 is observed. The use of higher photon‐energy excitation, however, is found to suppress tellurium segregation. Structural polymorphism of transition‐metal dichalcogenides is a key for developing a 2D phase‐change material. Herein, structural polymorphism of MoTe2 under high‐density femtosecond laser excitation is investigated by coherent phonon spectroscopy. Tellurium segregation with ablation‐like damage is uncovered without structural phase transition. It is found that the repetition rate and photon energy of laser play a central role in suppression of Tellurium segregation.