Print Email Facebook Twitter A Hybrid Readout Solution for GaN-Based Detectors Using CMOS Technology Title A Hybrid Readout Solution for GaN-Based Detectors Using CMOS Technology Author Padmanabhan, P. (Swiss Federal Institute of Technology) Hancock, Bruce (California Institute of Technology) Nikzad, Shouleh (California Institute of Technology) Bell, L. Douglas (California Institute of Technology) Kroep, Kees (External organisation) Charbon-Iwasaki-Charbon, E. (TU Delft (OLD)Applied Quantum Architectures; TU Delft OLD QCD/Charbon Lab; Swiss Federal Institute of Technology) Date 2018 Abstract Gallium nitride (GaN) and its alloys are becoming preferred materials for ultraviolet (UV) detectors due to their wide bandgap and tailorable out-of-band cutoff from 3.4 eV to 6.2 eV. GaN based avalanche photodiodes (APDs) are particularly suitable for their high photon sensitivity and quantum efficiency in the UV region and for their inherent insensitivity to visible wavelengths. Challenges exist however for practical utilization. With growing interests in such photodetectors, hybrid readout solutions are becoming prevalent with CMOS technology being adopted for its maturity, scalability, and reliability. In this paper, we describe our approach to combine GaN APDs with a CMOS readout circuit, comprising of a linear array of 1 × 8 capacitive transimpedance amplifiers (CTIAs), implemented in a 0.35 µm high voltage CMOS technology. Further, we present a simple, yet sustainable circuit technique to allow operation of APDs under high reverse biases, up to ≈80 V with verified measurement results. The readout offers a conversion gain of 0.43 µV/e−, obtaining avalanche gains up to 103. Several parameters of the CTIA are discussed followed by a perspective on possible hybridization, exploiting the advantages of a 3D-stacked technology. Subject 3D integrationAvalanche photodiodes (APDs)Capacitive transimepdance amplifier (CTIA)CMOS technologyGallium nitride (GaN)HybridizationUV imaging To reference this document use: http://resolver.tudelft.nl/uuid:7ab60f3a-0bbc-4bd5-b76f-4d5ffedbb450 DOI https://doi.org/10.3390/s18020449 ISSN 1424-8220 Source Sensors, 18 (2), 1-16 Part of collection Institutional Repository Document type journal article Rights © 2018 P. Padmanabhan, Bruce Hancock, Shouleh Nikzad, L. Douglas Bell, Kees Kroep, E. Charbon-Iwasaki-Charbon Files PDF sensors_18_00449_v2.pdf 20.78 MB Close viewer /islandora/object/uuid:7ab60f3a-0bbc-4bd5-b76f-4d5ffedbb450/datastream/OBJ/view