Abstract
We report new results on the design, fabrication and characterization of a novel midinfrared sensor called quantum dot avalanche photodiode (QDAP). The QDAP consists of a quantum dots-in-a-well (DWELL) detector coupled with an avalanche photodiode (APD) through a tunnel barrier. In the QDAP, the photons are absorbed in the DWELL active region while the APD section provides photocurrent gain. Spectral response and photocurrent measurements at 77 K were taken to characterize the response of the device. The increase of the spectral response and the nonlinear increase in the photocurrent as the APD voltage increases support theoretical predictions about the QDAP capability to work in Geiger mode. The QDAP photocurrent is similar to the IV characteristic of the APD section, indicating gain in the device.
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