🔍 *What happens to a diode under large forward voltage?* When the forward voltage V on a p-n junction approaches the built-in potential V₀, the barrier almost vanishes, theoretically allowing infinite current. But in real diodes, *practical limitations* kick in: 1️⃣ *Bulk Resistance:* The semiconductor material has a finite resistance, limiting the current flow. 2️⃣ *Ohmic Contact Resistance:* The metal-semiconductor interfaces also contribute resistance. These resistances prevent the barrier from reducing to zero and cap the current, protecting the diode. At high currents, the voltage drop across these resistances dominates, and the diode’s behavior shifts from exponential to *linear*, following Ohm’s Law. ⚡ *Takeaway:* In real-world diodes, resistances ensure stability, keeping the current and I-V characteristics practical under large forward voltages.