High-Temperature Performance of All-Diamond Solar-Blind UV Photodetector With BDD Electrodes

This work systematically investigated the high-temperature performance of an all-diamond UV detector utilizing heavily boron-doped diamond (BDD) as transparent electrodes. The dark current increases moderately from 5.65×10^-11 A at RT to 2.26×10^-10 A at 450 °C, while the photocurrent under 222 nm increases obviously, leading to the responsivity increasing from 0.07 A/W to 0.37 A/W. The UV-to-visible rejection ratio rises from 2.86×10⁴ to 1.16×10⁶. Dynamic response measurements reveals that the rise time increases slightly from 0.02 s to 0.1 s, while the decay time remains stable at 0.03 s, suggesting that the response speed is virtually unaffected by high temperatures. Furthermore, the optoelectronic properties of the detector remain consistent during continuous high-temperature operation and long-term tracking test, demonstrating excellent thermal stability. This study proves that the all-diamond detector with BDD transparent electrodes exhibits outstanding advantages in high-temperature stability and response performance, providing a promising pathway for the development of high-performance UV detection technology in harsh environments.