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Questions related from Abdelhalim Zekry
I studied the transport of majority carriers across the grain boundaries in polysilicon both experimentally and theoretically. In spite of the importance of this work no researcher looked at it....
03 March 2019 3,945 3 View
In this forum it is required to determine the factors limiting the current in the MOSM diode under the assumption of single charge type injection in the organic semiconductor. That is the metal...
12 December 2016 3,885 12 View
The organic semiconductors are molecular in nature and thereby have short range order and so they are different from the metallic semiconductors with long range order in crystalline form. The free...
11 November 2016 5,005 10 View
It is noticed from the questions on advanced solar cell structures such as thin film metallic and organic structures that they suffer from relatively low open circuit voltage, high ideality...
01 January 2015 9,652 7 View
How do you find the answer below on the given question: Why does the fill factor not go beyond 47% in inverted structure polymer solar cells devices (P3HT:PC60BM)? all the improvement i have done...
12 December 2014 9,156 1 View
In this session, it is required to invoke an important issue from my point of view. This issue is the utilization efficiency of the products. Is the utilization efficiency systematically taken...
07 July 2014 341 20 View
It is estimated that the energy consumption of the communication and information equipment is about five percent of the the global energy consumption which amounts to 20000 Twh.This needs power...
05 May 2014 4,854 34 View
Do you see that we use energy resources efficiently? Conventional energy resources are very limited. So, we must use them with highest savings and great care. Unfortunately, this is not the case;...
03 March 2014 9,499 91 View
It is required to establish a master of science training laboratory in photovoltaics. What are the necessary equipment required to set up such laboratory? Please give detailed specifications and...
01 January 2014 5,752 3 View
The life span of solar panels has been greatly improved over time since the introduction of the commercial solar panels in the seventies of the last century. Some experienced manufacturers grantee...
09 September 2013 4,561 18 View
The conventional commercial solar cells are made of p-type single crystalline substrates. It is required to work out, in this forum, the causes behind that. Could n-type substrates be equally as...
06 June 2013 9,385 5 View
The silicon solar cell is composed of a p-substrate and an n+- emitter. In this forum I wish to discuss the effect of the substrate parameters on the performance of solar cells.The parameters of...
05 May 2013 5,553 17 View
An n type semiconductor is disturbed homogeneously with an excess majority concentration dn at certain time instant t0 how long the material takes to revert to thermal equilibrium state? In many...
04 April 2013 5,867 5 View
There are similarities and differences between the flow of mobile charges in metals and semiconductors.
04 April 2013 2,255 5 View
Semiconductors are characterized by two types of mobile carriers, electrons in the conduction band and holes in the valence band. Both bands are separated by the energy gap. This energy gap is...
04 April 2013 3,359 42 View
The electrical materials are classified into insulators, semiconductors and conductors according to their ability to conduct electricity. Semiconductors have advanced the electronics industry in a...
04 April 2013 3,140 18 View
The electronic properties of a surface of a material are different from its volume properties. It is required to underline the surface properties and their effect on the performance of the...
04 April 2013 7,334 5 View
One used solar grade silicon to produce high efficiency solar cells. Solar grade silicon has a doping concentration of about 10^17/cm^3. If one succeeds to make such cells, then he can use less...
03 March 2013 3,726 12 View
Till now Silicon is still the most common material for solar cells production,can any material or a compound compete with silicon in the future? There is tremendous advancements in producing...
03 March 2013 7,936 20 View
There are many objects in electrical engineering. Among these objects there are very important primitive objects that stand behind the operation of many elements, devices, components of the...
03 March 2013 2,663 6 View
