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Why can't pressing p and n slabs together form a junction?
AContact turns them metallic
BRoughness exceeds atomic spacing
CThe slabs repel each other
DDopant atoms would evaporate
Answer & Solution
Correct answer: B. Roughness exceeds atomic spacing
Any surface is rough on a scale far larger than the 2 to 3 angstrom atomic spacing, so no continuous contact forms.
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