Question

The energy band diagrams for three semiconductor samples of silicon are as shown. We can then assert that

• A. sample X is undoped while sample Y and Z have been doped with a 'third group' and a 'fifth group' impurity respectively.
• B. sample X is undoped while both samples Y and Z have been doped with a 'fifth group' impurity.
• C. sample X has been doped with equal amounts of 'third and fifth group' impurity while samples Y and Z are undoped.
• D. sample X is undoped while samples Y and Z have been doped with a 'fifth group' and a 'third group' impurity respectively

Answer 1

Answer: (D)

$X, Y, Z$ represent an intrinsic, $N$ -type and $P$ -type semiconductors respectively