Universal Electrochemical Synthesis of Mesoporous Chalcogenide Semiconductors: Mesoporous CdSe and CdTe Thin Films for Optoelectronic Applications

Abstract

Here we report the soft‐template‐assisted electrochemical deposition of mesoporous semiconductors (CdSe and CdTe). The resulting mesoporous films are stoichiometrically equivalent and contain mesopores homogeneously distributed over the entire surface. To demonstrate the versatility of the method, two block copolymers with different molecular weights are used, yielding films with pores of either 9 or 18 nm diameter. As a proof of concept, the mesoporous CdSe film‐based photodetectors show a high sensitivity of 204 mW−1 cm2 at 680 nm wavelength, which is at least two orders of magnitude more sensitive than the bulk counterpart. This work presents a new synthesis route for nanostructured semiconductors with optical band gaps active in the visible spectrum.

Versatile core–shell magnetic fluorescent mesoporous microspheres for multilevel latent fingerprints magneto‐optic information recognition

“…These mesoporous microspheres possess many unique properties, including high surface area, large pore size and abundant mesostructures. [49][50][51][52][53] Moreover, the core-shell mesoporous structure protect cores from corrosion by acid or oxidation and provide porous shells for cargo loading and impregnation, thus expanding their applications. [54][55][56][57] The assynthesized Fe 3 O 4 @mesoSiO 2 microspheres were soaked in an aqueous solution containing of Y 3+ , Eu 3+ , and VO 4 3À (RE precursor) to introduce the precursor of YVO 4 :Eu 3+ into mesopore channels by virtue of capillary force.…”

“…After decompose RF in the outer RF/silica shell via calcination treatment, uniform Fe 3 O 4 @mesoSiO 2 microspheres were obtained. These mesoporous microspheres possess many unique properties, including high surface area, large pore size and abundant mesostructures 49–53 . Moreover, the core–shell mesoporous structure protect cores from corrosion by acid or oxidation and provide porous shells for cargo loading and impregnation, thus expanding their applications 54–57 .…”

Electrochemical fabrication of mesoporous metal-alloy films

“…9). 151 A soft-template directed electrodeposition was performed using PS-b-PEO block copolymer micelles. The pore size of the fabricated films was found to be substantially dependent on the weight of the block copolymer, with pore diameters of 9-9.5 nm and 17.7-18.0 nm for PS(5000)-b-PEO(2000) and PS(10000)-b-PEO(4100) respectively.…”

Recent developments in porous metal chalcogenides for environmental remediation and sustainable energy

“…The final product had a stoichiometric CdTe composition and preserved the templated mesostructure regularity. More recently, a versatile electrochemical synthesis method for preparing mesoporous chalcogenide semiconductor films was reported by Yamauchi's group 89,188 . According to this method, mesoporous chalcogenide semiconductor (CdTe, CdSe, copper telluride (CuTe), and copper selenide (CuSe or Cu 2 Se)) films were electrochemically prepared from an electrolyte solution containing metal ions and a chalcogenide precursor (TeO 2 or SeO 2 ), with a diblock copolymer (BCP) [polystyrene‐ block ‐poly(ethylene oxide), PS‐ b ‐PEO] as a template.…”