Articolo in rivista, 2017, ENG, 10.1109/LPT.2017.2680741

High Responsivity Fire Detectors Based on PbS Colloidal Quantum Dot Photoconductors

De Iacovo A.; Venettacci C.; Colace L.; Scopa L.; Foglia S.

NooEL, Nonlinear Optics and Optoelectronics Laboratory, Department of Engineering, University 'Roma Tre', Rome, 62 00146, Italy; CNR, Istituto dei Materiali per l'Elettronica ed il Magnetismo, Rome, 79 00146, Italy

In this letter, we report on high responsivity fire detectors based on PbS colloidal quantum dots photoconductors. The devices operate in the near infrared and are equipped with a visible light silicon filter for wavelength selectivity. Devices are fabricated by a simple, low cost, and silicon compatible process based on drop casting of a ligand exchanged solution of PbS nanoparticles. The photodetectors exhibit responsivity as high as 20 A/W at 1-V bias. We exploit the combination of their high responsivity and spectral response for the development of a novel fire detector able to detect a small flame at a distance exceeding 15 m in ambient illumination.

IEEE photonics technology letters 29 (9), pp. 703–706

Keywords

Colloidal quantum dots, fire detectors, photodetectors

CNR authors

Foglia Sabrina, Scopa Leonardo

CNR institutes

IMEM – Istituto dei materiali per l'elettronica ed il magnetismo