Which outcome occurs when the cut-off frequency is lowered in a heterojunction phototransistor?

💡 Explanation

Reduced cut-off frequency decreases the energy for photoexcited carrier creation via the photoelectric effect; this process governs generation. Lower energy implies longer wavelengths will not excite carriers because the incident light energy must exceed the bandgap; therefore, reduced responsivity at longer wavelengths occurs, rather than the alternative effects.

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