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Question 4 [3 Total Marks] In the figure below is given the electric field intensity (x) profile for a p-n junction made from a single semiconductor material. Describe (bullet points are sufficient; you may wish to sketch also) how the above electric field intensity profile changes if the p-n junction is a hetero-junction. A hetero-junction is a junction made from two different materials in contrast to a homo-junction that is made from a single material. That is, the p-region is made from one semiconducting material and the n-region is made from a different semiconducting material. Є(x)| -Xp Xn X