Le Chen, Haoran Ma, Caiyun Liu, Deyu Wang, Zhongyuan Han, Jiajin Tai, Hongwei Liang, Hong Yin
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Covalent Heteroepitaxy of Large‐Area Vertical Hexagonal Boron Nitride for High‐Temperature VUV Photodetectors
Hexagonal boron nitride (h‐BN) is a van der Waals (vdW) ultrawide bandgap semiconductor with high band‐edge absorption coefficient and chemical/thermal resistance, demonstrating great potential for vacuum ultraviolet (VUV) and UV‐C detection. Hitherto, most of their prevailing applications have exploited epitaxial films and multilayers either grown on substrates or transferred, which tend to form energy‐favorable noncovalent vdW epitaxy. Here, an alternative heteroepitaxy of 2‐inch h‐BN is reported with desirable thickness and vertically aligned vdW layers covalently bonded to sapphire, enabled by activating the inert substrate surface using ion impingement during deposition and the dislocation‐mediated epitaxial transition. The fabricated photodetectors allow efficient photon absorption and carrier collection using a simple planar device design, showing excellent VUV/UV‐C detection performance with ultrafast response of 270 ns/60 µs (rise/decay) and remarkable operating stability until 500 °C. This covalent heteroepitaxy of wafer‐scale h‐BN opens new avenues for optoelectronics and electronics significant to harsh environment applications.
期刊介绍:
Laser & Photonics Reviews is a reputable journal that publishes high-quality Reviews, original Research Articles, and Perspectives in the field of photonics and optics. It covers both theoretical and experimental aspects, including recent groundbreaking research, specific advancements, and innovative applications.
As evidence of its impact and recognition, Laser & Photonics Reviews boasts a remarkable 2022 Impact Factor of 11.0, according to the Journal Citation Reports from Clarivate Analytics (2023). Moreover, it holds impressive rankings in the InCites Journal Citation Reports: in 2021, it was ranked 6th out of 101 in the field of Optics, 15th out of 161 in Applied Physics, and 12th out of 69 in Condensed Matter Physics.
The journal uses the ISSN numbers 1863-8880 for print and 1863-8899 for online publications.