Which phenomenon limits the operating frequency of resonant tunneling diodes (RTDs) which uses quantum mechanical wave functions?

💡 Explanation

When RTDs operate, charge accumulation occurs within the quantum well because electrons are temporarily trapped due to resonant tunneling, limiting current response and thus, the maximum frequency. Therefore charge accumulation limits performance, rather than scattering, transfer, or polarisation, which are less dominant within the tunneling timescale.

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