Back-Irradiation Type Photo-Detector Arrays Using Field Emitter Device

Takashi ONO  Kazuaki SAWADA  Young Chul JUNG  Yoshitaka MORIYASU  Hidekuni TAKAO  Makoto ISHIDA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.9   pp.1805-1809
Publication Date: 2003/09/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Recent Progress in Photon Detection Technology)
Category: 
Keyword: 
field emitters,  photocathode,  photodiode,  silicon-on-sapphire,  

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Summary: 
A new type of photodetector called "photosensitive floating field emitter, (PFFE)" has been proposed. The PFFE device combines an n-type cone-shaped triode field emitter with a-Si p-i-n photodiode film. However, a PFFE cannot detect two-dimensional distributions of light intensity. In this paper, we propose a novel structure to overcome the above this problem of the PFFE. The device was fabricated on a silicon-on-sapphire substrate to permit irradiation from the backside. p-n photodiodes were constructed within a field emitters, the n+ region being separated by p+ regions to permit detection of two- dimensional light distributions. The emission current of the PFFE/SOS was found to be proportional to the illumination intensity, but the quantum efficiency was only about 2%. This quantum efficiency is lower than that expected. Under irradiation, the emission current increased, but the gate-leakage current increased. This gate-leakage current was several orders of magnitude larger than the emission current. Almost photo-generated electrons lost in the gate electrode.