| UV-enhanced series |
| Junction and planar UV silicon photodiodes |
OEC offers two different UV-enhanced silicon photodiodes: junction series and planar series. Both series are specially designed for low-noise detection in the UV-B region of the electromagnetic spectrum. UV-enhanced junction photodiodes have an internal quantum efficiency of 100% and are well suited for low-intensity light measurements. They feature high shunt resistance, low noise, and high breakdown voltage. The uniformity of sensitivity across the surface and the quantum efficiency improve with 5 to 10 volts of applied bias. In photovoltaic operation (without bias), the capacitance is higher than in planar devices, but it decreases rapidly with applied bias. Deviations from photocurrent linearity occur at lower light levels in junction devices compared to planar devices. Below 700 nm, their sensitivity varies slightly with temperature. UV-enhanced planar photodiodes (UV-D series) offer significant advantages over junction devices, such as lower capacitance and higher response speed. These devices maintain photocurrent linearity even at higher light intensities compared to junction devices. They have relatively lower sensitivity and quantum efficiency compared to junction devices. Two types of planar-diffused UV-enhanced photodiodes are available: UVD and UVE. Both series have nearly identical electro-optical characteristics, except that the UVE series suppresses NIR sensitivity. This is particularly desirable when blocking the NIR portion of the spectrum is necessary. UVD devices peak at 970 nm, while UVE devices peak at 720 nm. Both series can be biased for lower capacitance, faster response times, and a wider dynamic range, or operated in photovoltaic mode (without bias) for applications requiring low drift under varying temperatures. The UVE devices have higher shunt resistance than their UVD counterparts, but they also have higher capacitance.
Features
- Junction series: 100% internal QE
- Ultra-high R-shunt
- Planar series
- NIR suppressed
- High-speed response
- High stability
- Excellent UV sensitivity
Applications
- Environmental pollution monitoring
- Medical equipment
- UV dosimeter
- Spectroscopy
- Water treatment
- Fluorescence