A quasi-2D perovskite antireflection coating to boost the performance of multilayered PdTe₂/Ge heterostructure-based near-infrared photodetectors

Abstract

A hybrid heterostructure composed of two-dimensional (2D) material/narrow bandgap semiconductor represents a promising platform for designing highly efficient and cost-effective near infrared (NIR) photodetectors. However, performance enhancement is usually restricted...

Fully‐Depleted PdTe2/WSe2 van der Waals Field Effect Transistor with High Light On/Off Ratio and Broadband Detection

“…[ 9 ] From the Raman spectrum of PdTe 2 , two main peaks of PdTe 2 can be seen at ≈57 and 137 cm −1 . The stronger peak at 57 cm −1 in response to the E g 1 phonon mode, and the peak at 137 cm −1 corresponds to the A 1g 2 phonon mode [ 7,10 ] (Figure 1d red line). In the heterostructure region of the device, Raman characteristic peaks of WSe 2 and PdTe 2 can be clearly observed, which are consistent with the corresponding reported spectra (Figure 1d black line).…”

MAPbBr3−nXn (X = Cl, I) single-crystal narrowband photodetectors for potential application in traffic light recognition

“…3(b) summarizes the relative balance ( V max − V min )/ V max as a function of the modulating frequency of the MAPbCl 0.7 Br 2.3 , MAPbBr 1.6 I 1.4 and MAPbBr 1.2 I 1.8 based narrowband photodetectors. The −3 dB frequency ( f −3dB : defined as the frequency where the photoresponse declined to 70.7% of its maximum value) 35 could reach 835, 840 and 1410 Hz, respectively. Based on the definitions, 36 the rise/fall times were estimated from the magnified photoresponse curves recorded at 835, 840 and 1410 Hz (see Fig.…”

A study on the refractive index of sol-gel Ba1-xGdxTiO3 thin films using spectroscopic ellipsometry

“…Antireflection (AR) coatings are considered one of the most effective strategies to minimize optical loss for solar cells as illuminated by solar radiation [1,2]. Perovskites are promising materials to be used as the active layer in solar cells for those that have a reasonable value of energy bandgap, while using the wide bandgap perovskites type as a top antireflection layer to reduce light reflection and enhance high energy photon absorption [3,4]. Among perovskites, BaTiO 3 has a wide bandgap, high ultraviolet and visible spectrum transparency, and a relatively high refractive index [5].…”