Semiconducting layer

The result can be simplified by making use of the above-defined pinch-off voltage [Eq. (14.54)1 and dielectric capacitance of the semiconducting layer. Further simplifications result from the assumptions that Cs 2> C, (Eq. (14.57)), and that the dopant and carrier concentrations arc equal (Eq. (14.58)). 

In Fig. 29 the crucial elements are the p-doped Si layer, which can be replaced by any thin semiconducting layer, and the very thin insulator below the gate electrode. FET behavior was observed for polymeric LB films three decades ago [138], and by... 

Ion-selective electrodes are systems containing a membrane consisting basically either of a layer of solid electrolyte or of an electrolyte solution whose solvent is immiscible with water. The membrane is in contact with an aqueous electrolyte solution on both sides (or sometimes only on one). The ion-selective electrode frequently contains an internal reference electrode, sometimes only a metallic contact, or, for an ion-selective field-effect transistor (ISFET), an insulating and a semiconducting layer. In order to understand what takes place at the boundary between the membrane and the other phases with which it is in contact, various types of electric potential or of potential difference formed in these membrane systems must first be defined. 

Zhang Y, de Boer B, Blom PWM (2009) Controllable molecular doping and charge transport in solution-processed polymer semiconducting layers. Adv Funct Mater 19 1901... 

B) and transfer (C) characteristics of SAP TFT with F8T2 semiconducting layer. (Reprinted with permission from Reference [45], Copyright (2005) by Wiley). 

In German coal mines, two different protective circuits are established method A uses a common concentric conductor (kz and t in Fig. 12.3(d)) as a protective earthed (PE) conductor. The semiconductive layer (pp) is used as a monitoring conductor (UL) with (z) an uninsulated copper conductor to lower the longitudinal resistance. Between PE and UL, a sinusoidal monitoring... 

The operation of photocells and photomultipliers is based on the external photoelectric effect. Photons impinging on the surface of a photosensitive cathode (photocathode) knock out electrons which are then accelerated in the electrical field between the cathode and the anode and give rise to electric current in the outer circuit. The spectral sensitivity of a photocell depends on the material of the photocathode. The photocathode usually consists of three layers a conductive layer (made, e.g., of silver), a semiconductive layer (bimetallic or oxide layer) and a thin absorptive surface layer (a metal from the alkali metal group, usually Cs). A photocathode of the composition, Ag, Cs-Sb alloy, Cs (blue photocell), is photosensitive in the wavelength range above 650 nm for longer wavelengths the red photocell with Ag, Cs-O-Cs, Cs is used. The response time of the photocell (the time constant) is of the order of 10" s. 

Fig. 6 Principles of device function for organic semiconducting layers sandwiched between two metallic electrodes a short circuit condition, b flat band condition, c reverse bias, and d forward bias. Band bending effects at the ohmic contacts are neglected...

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