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Title : XFAB Presents Photodiode Improvements, Reports 20% Smartphone ALS Market Share
link : XFAB Presents Photodiode Improvements, Reports 20% Smartphone ALS Market Share

XFAB Presents Photodiode Improvements, Reports 20% Smartphone ALS Market Share

X-FAB Foundries unveils a new photodiode-specific process core module. Whereas previously the XS018 process had been mainly focused on the fabrication of multi-pixel CMOS image sensors, this new module is dedicated to photodiode fabrication. 

Through this module, X-FAB offers six different photodiode options. These cover wavelengths from UV to NIR. The new photodiodes are capable of delivering best-in-class UV sensitivity, attaining 40% QE in the UVA band, 50-60% QE in the UVB band, and over 60% QE in the UVC band. At 850 nm the photodiodes have 17% greater QE than legacy devices based on the original XH018 process, and at 905 nm there is a 5% QE increase witnessed. With a QE of approximately 90%, the human eye response option is highly suited to ambient light sensing applications. 

A unique feature means that photodiode responsivity can be stipulated, via specifying the size of the metal aperture. The output current of the photodiode is thereby scalable between full current and no current – in order that any differences caused by filtering can be compensated for. This in turn simplifies the accompanying amplification circuitry for photodiode arrays. Other enhancements include a 10% increase in the fill factor compared to devices based on the earlier XH018 generation.

“Through ongoing investment, X-FAB has built up strong optoelectronic credentials. Among the proof points of this is the fact that over 20% of mobile phone handsets manufactured worldwide feature an ambient light sensor that was produced by us,” states Luigi Di Capua, VP of Product Marketing at X-FAB. “Thanks to the advances we have announced in relation to our photodiode offering, we will now be better positioned to address client demands for proximity sensing, spectral analysis and optical distance/triangulation measurement solutions.”

The six photodiodes are available now.

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