In this work, the parameters of antireflection interference coatings based on alternating layers ZnS/Al2O3 laser-induced damage threshold (LIDT) ZGP crystals under action Ho:YAG laser radiation at a wavelength 2.097 μm were determined. The coating deposition was carried out using ion-beam sputtering method. LIDT sample with ZnS and Al2O3 equal to WoE = 3.45 J/cm2, uncoated 2.23 J/cm2. An increa...

This chapter gives an overview of the theoretical bases of surface passivation and antireflection coating and describes the methods and equipment used to characterize the layers created in this work. While surface passivation is quantified by the effective surface recombination velocity Seff , this parameter cannot be measured directly. Instead, the lifetime measurements by QSSPC and ”PCD carri...

Perovskite solar cells have attracted much attention due to their easy fabrication, low cost, and high photoelectric conversion efficiency. To reduce pollution, the absorption layer thickness of perovskite should be reduced. Moreover, ultrathin can effectively depress electron–hole recombination in process carrier transfer. However, light cell is not satisfactory. The promising pathways design ...

We present a systematic method for designing a perfect antireflection coating (ARC) of a one-dimensional (1D) photonic crystal (PC) with an arbitrary unit cell. We use Bloch wave expansion and time reversal symmetry, which leads exactly to analytic formulas of structural parameters for the ARC and renormalized Fresnel coefficients of the PC. Surface immittance (admittance and impedance) matchin...

We report an external cavity diode laser (ECDL), using a diode whose front facet is not anti-reflection (AR) coated that has a mode-hop-free (MHF) tuning range greater than 135 GHz. We achieved this using a short external cavity and by simultaneously tuning the internal and external modes of the laser. We find that the precise location of the pivot point of the grating in our laser is less crit...

This research work focuses on augmenting the power conversion efficiency of polycrystalline silicon solar cell with aid antireflection coating (ARC) synthesized molybdenum disulphide (MoS2). The sol-gel technique and electrospraying method were preferred for synthesizing depositing MoS2 as transparent thin films surface cells. optical, electrical, structural, thermal properties coated cells ana...