Burst58alto: Створена сторінка: Furthermore, there are no influences of interface states taken into account that might give rise to additional space charges and barriers. If we consider a narr...

2017-04-14T04:54:13Z

Створена сторінка: Furthermore, there are no influences of interface states taken into account that might give rise to additional space charges and barriers. If we consider a narr...

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Furthermore, there are no influences of interface states taken into account that might give rise to additional space charges and barriers. If we consider a narrow band gap, p-type semiconductor 1, and a wide gap, n-type semiconductor 2, the J�CV characteristics can be written as [9] Here the partial voltage decrease over semiconductor 1 and 2 is given by V 1 and V 2. If we consider a p�Cn heterojunction, where V bi,1 > ��E C, there is no barrier for the charge carriers in semiconductor 1 to reach the semiconductor 2 and the equation can [http://www.selleckchem.com/products/Vandetanib.html ZD6474 price] be reformulated as [10] with [11] Here the assumption is made that the current is limited by the rate at which holes can diffuse in the narrow band gap material. X is the fraction of those carriers having sufficient energy to cross the barrier, a is the junction area and N V , 2 is the effective density of states of the valence band for the semiconductor 2. This leads to a J�CV curve of similar form to the ideal Shockley equation curve. Up to this point, no other transport mechanisms such as tunneling through the interface barrier, recombination at the interface, [http://www.selleckchem.com/products/ON-01910.html check details] or a voltage-dependent barrier height have been taken into account. If these processes are relevant for the J�CV characteristics, the temperature-dependent J S (the exponential prefactor in Eq. 10) can be written as: [12] where E B is the effective energy barrier for the transport across the interface and n is the ideality factor described below. Photovoltaic effect Under illumination, additional charge carriers are generated and are separated in the electric field of the SCR, resulting in a photocurrent. The typical parameters characterizing the [http://en.wikipedia.org/wiki/TRIB1 TRIB1] photovoltaic effect in solar cells are the short-circuit current density, J SC, and the open circuit voltage, V OC. The analysis of the temperature dependence of these parameters gives additional information about the electronic structure of the p�Cn interface and the transport mechanism across the interface. In inorganic junctions, the temperature dependence of the open circuit voltage is given by [13] for J S

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Burst58alto: Створена сторінка: Furthermore, there are no influences of interface states taken into account that might give rise to additional space charges and barriers. If we consider a narr...