Photosensitivity of the PbS Colloidal Quantum Dot-Based Nanostructures with an Energy Barrier

• Published in: Doklady. a journal of the Russian Academy of Sciences. Physics Vol. 68; no. 7; pp. 233 - 236
• Main Authors: Popov, V. S., Ponomarenko, V. P., Dymkin, D. V., Shuklov, I. A., Gadomska, A. V., Brichkin, S. B., Lavrentiev, N. A., Gak, V. U., Mirofyanchenko, A. E., Mirofyanchenko, E. V., Katsaba, A. V., Arsenov, P. V., Ivanov, V. V., Razumov, V. F.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.07.2023; Springer Nature B.V
• Subjects: Classical Mechanics; Colloids; Mathematical and Computational Physics; Nanostructure; Nanowires; Photosensitivity; Physics; Physics and Astronomy; Quantum dots; Room temperature; Spectral sensitivity; Technical Science; Theoretical; Zinc oxide; photosensor; quantum dot; optical absorption; energy barrier
• ISSN: 1028-3358; 1562-6903
• DOI: 10.1134/S1028335823070066

A new architecture of photosensitive elements for the near- (0.7–1.4 μm) and short-wavelength (1.4–3.0 μm) infrared spectral ranges is proposed, which is based on hybrid nanostructures consisting of PbS colloidal quantum dots and ZnO and silver nanowire functional layers. Small-sized (12 × 12 μm) photosensitive elements with an energy barrier at the contact between layers of colloidal quantum dots with n - and p ‑type conductivity have been studied. The I‒V characteristics, spectral dependences of optical absorption, and relative spectral photosensitivity S i (λ)/S i (λ max ) of the barrier structures at room temperature have been examined. It is shown that the proposed architecture of the barrier structures ensures the photosensitivity in a wide spectral range from 0.4 to 2.0 µm. An excess of the average value of the relative spectral sensitivity S i (λ)/S i (λ max ) by a factor of about 1.5 as compared with the values observed previously for the PbS colloidal quantum dot barrier nanostructures in the wavelength range of 0.9–1.85 μm has been found.