Question
Download Solution PDFIn an open-circuited step-graded junction, the left-half of the bar is p-type with a constant concentration NA, whereas the right-half is n-type- with a uniform density ND. In this type of doping, the density changes abruptly from p-type to n-type. What is the contact difference of potential V0?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFContact potential difference:
The contact potential difference, Vo, in an open-circuited step-graded junction is given by:
V0 = \(\frac {k.T}{q}.ln(\frac{N_A.N_D}{n^2_i})\)
where,
k is the Boltzmann constant.
T is the temperature.
q is the elementary charge.
NA is the acceptor concentration.
ND is the donor concentration.
ni is the intrinsic carrier concentration.
\(V_0 = V_T.ln(\frac{N_A.N_D}{n^2_i})\)
Where,\(V_T = \frac {k.T}{q}\) is the thermal voltage.
Here, option 4 is correct.
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