Schottky photodiode using submicron thick diamond epilayer for flame sensing

Abstract

The sensing of a flame can be performed by using wide-bandgap semiconductors, which offer a high signal-to-noise ratio since they only response the ultraviolet emission in the flame. Diamond is a robust semiconductor with a wide-bandgap of 5.5 eV, exhibiting an intrinsic solar-blindness for deep-ultraviolet (DUV) detection. In this work, by using a submicron thick boron-doped diamond epilayer grown on a type-Ib diamond substrate, a Schottky photodiode device structure-based flame sensor is demonstrated. The photodiode exhibits extremely low dark current in both forward and reverse modes due to the holes depletion in the epilayer. The photodiode has a photoconductivity gain larger than 100 and a threshold wavelength of 330 nm in the forward bias mode. CO and OH emission bands with wavelengths shorter than 330 nm in a flame light are detected at a forward voltage of -10 V. An alcohol lamp flame in the distance of 250 mm is directly detected without a focusing lens of flame light.

Semiconductor ultraviolet photodetectors based on ZnO and MgxZn1−xO

“…Simultaneously, substantial progress has been made on other WBG semiconductors including diamond and β−Ga 2 O 3 , symbolized by synthesis of their single-phase bulk wafers [11,12]. Solid state UV PDs working in the solar-blind region under room light have also been successfully realized on these WBG semiconductors [13,14].…”

Unleashing the Power of Quantum Dots: Emerging Applications from Deep‐Ultraviolet Photodetectors for Brighter Futures

“…Hydrocarbon-based substances emit various electromagnetic waves during the combustion. [124,125] The most widely used optical flame sensor is the photomultiplier tube (PMT). [126] PMTtype sensors exhibit ultra-high sensitivity owing to the multiple amplification but have disadvantages such as bulky size, high cost, large power consumption, and interference, which limit their advanced applications.…”

对人工合成金刚石的三阶非线性光学极化率的研究

“…The technology improvement on, and the price decrease of large-sized synthetic diamonds have promoted the application and further development of diamonds. For example, artificial diamond sensors have been widely used for detecting radiation [6] , charged particles [7] , temperature [8] , etc. Diamonds belong to the m3m point group and have inverse symmetry.…”