Low-voltage high-gain resonant-cavity avalanche photodiode |
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| Authors: | R. Kuchibhotla A. Srinivasan J.C. Campbell C. Lei D.G. Deppe Y.S. He B.G. Streetman |
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| Affiliation: | Microelectron. Res. Center, Texas Univ., Austin, TX, USA; |
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| Abstract: | For p-i-n photodiodes and avalanche photodiodes (APDs) in the low-gain regime, there is a performance tradeoff between the transit-time contribution to the bandwidth and the quantum efficiency. A new photodetector structure is demonstrated that alleviates limitations imposed by this tradeoff. This structure utilizes a thin ( approximately=900 AA) depleted absorbing layer to reduce the transit time and achieve avalanche gain at low bias voltage (V/sub b/ approximately=9 V). The external quantum efficiency has been enhanced ( eta /sub e/>49%) by incorporating the structure into a resonant cavity.<> |
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