Thermal Conductivity above 2,000 W/m·K in Boron Arsenide by Nanosecond Transducer-Less Time-Domain Thermoreflectance.

ABSTRACT: Time-domain thermoreflectance (TDTR) has been a standard technique for measuring thermal conductivity (κ) for more than 3 decades, yet its reliance on femtosecond lasers and metal transducers has limited its broader adoption in the materials community. Recent attempts to eliminate the metal layer have achieved partial success but have been hampered by dominant reflectance from photoexcited carriers, arising from the continued use of femtosecond pump and 800-nm probe pulses. Here, we introduce a nanosecond transducer-less TDTR (tl-TDTR) method that overcomes this challenge. Using ~80-ns pump pulses and a 450-nm continuous-wave probe, we suppress carrier-induced negative transients, yielding positive signals characteristic of pure thermoreflectance. Thermal conductivity is extracted via heat

SUBMITTER: Zhong H 

PROVIDER: S-EPMC12554925 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature