Study the effect resistivity slide and the time of etching on silicon surfaces morphology of producing photovoltaic method

	Study the effect resistivity slide and the time of etching on silicon surfaces morphology of producing photovoltaic method
Tikrit Journal of Pure Science
Article 1, Volume 21, Issue 7, 2016, Pages 152-161
Abstract
Our work focusing on studying the effect of the etching time and Resistivity on morphology of the Surfaces which is producted by the photochemical etching method from the wafer silicon n-type which is used ,where is found by increasing the etching time from 70min to 100 min the high of the nano structural is increasing from 4.17nm to 11.3 nm of same n-type silicon wafer, while we studying the Resistivity effect on morphology the results was declare increasing in the product nano structures( i.e the depth etching increase) from 4.11nm to 10 nm under same etching time 70 min of the difference of the wafer resistance and the etching time, and how that's be effecting on the Surface Topographic for the used silicon wafers, Where as much as with increasing the etching time for same wafer the etching depth increasing . This is up to difference in resistance ,Every time the resistance less that's the aching depth longer, The reason of that , the freedom that’s carriers (holes) have it and accessibility to the surface with shape great than from the wafers have high resistance. So the resistance which responsible of different among aching depth. Either increase in depth for same wafer by increase the aching time, that’s up to the extraction mechanism which the fluore atoms do it, every time increase the aching time the F atoms floundered at the surface extractioning the si atoms from the surface and freeing H gas and the prodected nano silicon and ruling in its producting conditions considering the first steep of ruling in the devices properties (sensors, Diods, sensors. photocells) and its applications. At the end all of this is important in forware the searching operations and the developing of renewable.

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