Abstract
In this work, the application of quantum dots is evaluated in order to sensitize the commercially popular Si detectors in the UV range. The wavelength-shifting properties of two types of all-inorganic halide perovskite quantum dots as well as ZnCuInS/ZnS quantum dots are determined in order to assess their potential in the effective enhancement of the sensors’ detection range. In a further part of the study, the wavelength-shifting layers are formed by embedding the quantum dots in two kinds of polymers: PMMA or Cyclic Olefin Polymer. The performance of the layers is evaluated by transmission and PLE measurement. Incorporating the nanoparticles seemingly increases the transmittance in the UV range by several percent. The observed phenomenon is proportional to the quantum dots to polymer concentration, which indicates the successful conversion action of the luminescent agents.
Highlights
Ultraviolet (UV) photon detection is currently becoming increasingly important in many fields of application
The polymers used for the base layers were: PMMA of avg. mol wt. ~350,000 g/mol purchased from Sigma Aldrich and Cyclic Olefin Polymer ZEONEX® 480 purchased from Zeon Europe GmbH
The PLQY is set to 10% in order to compensate all the “optimistic” assumptions described in the previous points as well as to “smooth” the curves presented in the results presented in Figure 20 are based on so many unknowns that they cannot be treated quantitatively, one can see that the potential of responsivity gain in the UV range is very significant
Summary
Ultraviolet (UV) photon detection is currently becoming increasingly important in many fields of application. The semiconductor-based UV–vis sensor is traditionally configured with Si material, its sensitivity in UV is quite poor—typically, for an unbiased detector, it is around 0.1 A/W, which is less than 20% of the maximum responsivity value [1,2,3]. To detect UV light, photodetectors based on wide-bandgap materials such as GaN, SiC, ZnO [4] can be used. They are visible-blind UV detectors, which is often an advantage, in some applications, visible range detection is required
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