In a `p-n` junction diode, change in temperature due to heating

Options

A. Does not affect resistance of p-n junction
B. Affects only forward resistance
C. Affects only reverse resistance
D. Affects the overall V-I characteristics of p-n junction.

Explanation

To solve the question regarding the change in temperature due to heating in a p-n junction diode, let's break it down step by step.

### Step 1: Understand the p-n junction diode
A p-n junction diode is formed by joining p-type and n-type semiconductors. It allows current to flow in one direction (forward bias) and blocks it in the opposite direction (reverse bias).

**Hint:** Remember that the p-n junction diode's behavior is influenced by the charge carriers (holes and electrons) and their movement across the junction.

### Step 2: Identify the factors affecting the diode
The performance of a p-n junction diode, including its forward and reverse resistance, is influenced by temperature. As temperature increases, the intrinsic carrier concentration in the semiconductor also increases, which affects the diode's characteristics.

**Hint:** Consider how temperature affects the mobility of charge carriers and the energy levels in the semiconductor.

### Step 3: Analyze the impact of temperature on I-V characteristics
When the temperature of the diode changes, it alters the I-V (current-voltage) characteristics. Specifically, an increase in temperature typically decreases the forward voltage drop and increases the reverse saturation current.

**Hint:** Think about how the I-V curve shifts with temperature changes and how it affects the diode's operation.

### Step 4: Evaluate the options given in the question
The question provides multiple options regarding the change in temperature due to heating. Since we know that both forward and reverse resistances depend on temperature, we can conclude that the overall I-V characteristics will also be affected.

**Hint:** Look for the option that states the relationship between temperature and the I-V characteristics of the diode.

### Step 5: Conclusion
Based on the analysis, we can conclude that the correct answer is that the change in temperature affects the I-V characteristics of the diode. Therefore, option D is the correct answer.

**Final Answer:** The change in temperature due to heating in a p-n junction diode affects its I-V characteristics.