CC BY
11LS-P-13
LASER SYSTEMS AND MATERIALS
Chalcogenide Film Electrical and Optical Properties Modification by 1064
nm Laser Irradiation
A.A. Olhova, A.A. Patrikeeva, I.G. Zaytsev, M.M. Sergeev
ITMO University, St. Petersburg, 197101, Russian Federation Main author email address: lazareva.a.a@mail.ru
The pulsed laser influence on the optical properties and PbSe films structure modification was investigated.
In recent years, the issue of preserving the environment from harmful emissions into the atmosphere from the production of the oil and gas, coal and chemical industries has been increasingly raised. For effective space sensing and environmental protection, various gas analyzers and sensors capable of capturing the content of harmful substances in the air are in demand. Chalcogenide films are excellent gas detectors because they have high absorption in the IR range, where gas molecules have absorption peaks. There are many ways to increase the photosensitivity of such films: heat treatment, alloying, etc., however, one of the affordable and low-cost methods is laser modification of their structure.
The result of laser influence on PbSe films at a moving spot of pulsed radiation with a 1064 nm wavelength was studied. The laser processing of these films in the scanning regime led to the formation of a track in the case of structure photodarkening and photobleaching (Fig. 1). The spectral reflection in these regimes differ insignificantly from each other and tend to black body, however, they have a strong difference from the original PbSe film and are close in position to the film after heat treatment.
ALT'22
Fig. 1. Reflectance spectra and SEM images obtained from samples subjected to various treatments
Thus, the possibility of controlling the optical and structural characteristics of lead selenide films by means of pulsed laser radiation was demonstrated. Laser processing of this material can be used in the application of gas analysis, since chalcogenide films have a high absorption capacity in the mid-IR range (1-4 ^m), as well as in the creation of substrates for microanalytical studies of various liquids.
