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Compared to a $p-n$ junction with $\mathrm{N}_{\mathrm{A}}=\mathrm{N}_{\mathrm{D}}=10^{14} / \mathrm{cm}^{3}$, which one of the following statements is $\text{TRUE}$ for a $p-n$ junction with $\text{N}_{\text{A}}=\text{N}_{\text{D}}=10^{20} / \text{cm}^{3}?$

1. Reverse breakdown voltage is lower and depletion capacitance is lower
2. Reverse breakdown voltage is higher and depletion capacitance is lower
3. Reverse breakdown voltage is lower and depletion capacitance is higher
4. Reverse breakdown voltage is higher and depletion capacitance is higher