Solution-based photodetectors for monolithically integrated low-cost short-wave infrared focal plane arrays

Official URL: http://dx.doi.org/10.1117/12.2018496

In this work, PbS Colloidal Quantum Dots (CQD) based photodiodes are realized on both silicon substrates and on the replicas of the ROICs in order to demonstrate fully integrated FPAs. Careful optimization of PbS CQD film formation and ligand exchange process, together with optimization of IC integrable process steps resulted in high performance, monolithically integrable photodiodes. High quantum efficiencies such as 32% is achieved for photodiodes on Si substrates and high responsivities up to 5,73 A/W is achieved for photodiodes on ROIC replicas. Also these detectors achieved very high normalized detectivities such as; 1.36 x 10(11) Jones and 1.42 x 10(12) Jones under 1V and 2V reverse bias respectively, which is close to conventional InGaAS SWIR detectors.