Tricolor narrowband planar perovskite photodetectors based on FP microcavity structure

Abstract

This paper presents a novel tunable narrowband photodetector based on Ag-MgF2-Ag (metal-dielectric-metal: MDM) Fabry-Perot (FP) microcavity structure. The tunability is achieved through precise adjustment of the thickness of the metal and intermediate dielectric layers of the FP microcavity, taking into account the response spectral range of planar perovskite. After optimizing the parameters mentioned above, the prototype devices were prepared by combining the perovskite layer and MDM layer. The center wavelength of the planar detector can be tuned from 430 nm to 680 nm within the detection band of 400-800 nm, with a narrow FWHM about 30 nm and a relatively high response of 0.05 A/W @ 5 V bias voltage for 500 nm. Meanwhile the rise and fall times of the detector are 375 ms and 550 ms, respectively. The experimental results are corroborated by the theory. Our design is highly beneficial to such applications as hyperspectral photography and color-related active optical devices, which paves the way to design this kind of triple structure.

Organic Electronics in Biosensing: A Promising Frontier for Medical and Environmental Applications

“…The resulting free electrons and holes are then separated and collected by an internal electric field, thus creating a photocurrent or a change in voltage, which is directly proportional to the intensity of the incident light. Planar-type photodetectors encompass various designs, including photodiodes, phototransistors, and avalanche photodiodes [104][105][106]. Photodiodes collect the separated carriers directly, thus offering a linear response to incident light.…”

Spatially selective narrow band and broadband absorption in Ag/SiO2/Ag based trilayer thin films by oblique angle deposition of SiO2 layer

“…These structures have been explored for generation of structural colours in the reflection and transmission spectra by playing with the metallic layers [13]. Apart from this, the MDM structures can also find potential applications in broadband absorbers [14,15], stable solar energy harvester [16,17], colour photodetectors [18,19], colour filters [20,21] etc. However, tunability is a major drawback in such structures because once deposited or fabricated, the device can only resonate at a particular wavelength depending upon the angle of incidence and cavity layer thickness and refractive index.…”