GATE EC 2020 Set 1 — Question 17
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Electronic Devices → Carrier Transport → Forward & Reverse Bias
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Question
Consider the recombination process via bulk traps in a forward biased homojunction diode. The maximum recombination rate is . If the electron and the hole capture cross-sections are equal, which one of the following is FALSE?
Correct answer
(B) Uₘₐₓ occurs at the edges of the depletion region in the device.
Solution
In a forward-biased junction, the Shockley-Read-Hall (SRH) recombination rate is given by . For equal capture cross-sections and assuming , the maximum recombination rate occurs where . This condition is typically satisfied near the center of the depletion region, not at the edges. Therefore, statement (B) is false.
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