Toyohashi University of Technology

Fumihiro Dasai

Kazuaki Sawada

Masato Futagawa

Hirokazu Nakazawa

Proposed is a device for detecting a chemical/physical phenomenon, in which, via a novel scheme, charges are accumulated in a charge accumulation region. An amount of charges thus accumulated reflects the potential of a sensing region and the potential corresponds to an external environment (chemical phenomenon or physical phenomenon) to be detected. A charge accumulation regionincludes a first potential well region FDthat is continuous with a sensing region, the boundary potential of the charges held in the first potential well region FDbeing made equal to the potential of the sensing region, whereby the potential of the sensing regionis made to be reflected in the amount of charges held in the first potential well region FD

Device for detecting chemical/physical phenomenon

Provided is a charge-transfer-type sensor suitable for high integration while eliminating a potential barrier. A sensor provided with a semiconductor substratepartitioned into a sensing regionin which a potential varies in corresponding fashion to a variation in the external environment, a charge input regionfor supplying charges to the sensing region, an input charge control regioninterposed between the sensing regionand the charge input region, and a charge accumulation regionfor accumulating electric charges transported from the sensing region, the sensor for detecting the amount of electric charges accumulated in the charge accumulation region, wherein a diffusion layeris formed between the input charge control regionand the sensing regionof the substrate, and dopants for producing charges having the same polarity as the charges supplied from the charge input regionare diffused in the diffusion layer

Device for detecting chemical/physical phenomenon having a diffusion layer formed between an input charge control region and a sensing region on a substrate

The purpose of the present invention is to measure pH of a sample with high accuracy in a pH sensor array, without the use of a glass reference electrode. Each time that a sample is measured, the potential Vrm of the sample is identified, and the identified potential Vrm is used to calculate the pH. The outputs Voiand Voiof a first element and a second element located near one another in a sensor array are represented as follows. Voi=Si&#xd7;pHi+Gi&#xd7;Vrm+Ci, Voi=Si&#xd7;pHi+Gi&#xd7;Vrm+Ci. Voi is the output of the element, Si and Gi are sensitivity coefficients, and Ci is a constant, these values having been derived in advance. Here, where the potential Vrm is constant, and the elements located near one another are presumed to be at equal pH (pHi=pHi), the potential Vrm is identified by solving a linear equation with two unknowns.

Method for identifying pH, device for same, and method for identifying ion concentration

Provided are a device for detecting chemical and physical phenomenon suitable for high integration, and a method therefor. Rather than using a TG section signal to select pixels that require charge measurement, the on-off timing (the timing for moving the charge from a sensing section to an FD section) of the TG section is harmonized for all pixels, and the release or injection of the charge to the sensing section is separately controlled, whereby the charge is held only in sensing sections of pixels that require charge measurement, and the charge is emptied in sensing sections of pixels that do not require charge measurement. In this state, the TG section of all pixels can be opened at the same time, whereby the charge is transferred to the FD section from only the sensing sections holding a charge, and the charge level of the pixel is detected.

Method for detecting chemical and physical phenomenon, and device therefor

Provided is a device adapted for detecting chemical and physical phenomena and suitable for high integration, and a method for controlling the detection device. When a plurality of pH-detecting devices are used, a variation in sensitivity occurs in each of the sensing units. The variation in sensitivity can be calibrated using a simple method. The amount of charge (output signal) delivered by each of the sensing units to a standard solution is determined, and the difference between the delivered charge amount and a standard charge amount (standard output signal) delivered by a standard sensing unit is determined. The capacity of the potential well of the sensing unit is changed, or the potential of a TG unit when a charge is delivered is changed, so as to cancel out the difference.

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Toyohashi, Japan

Fumihiro Dasai