Application of a dual functional blocking layer for improvement of the responsivity in a self-powered UV photodetector based on TiO₂ nanotubes

Abstract

A layer of graphene quantum dots (GQDs) was applied on the photoanode of a self-powered photoelectrochemical (PEC) UV photodetector based on TiO2 nanotubes (NTs).

Wide Response Range Photoelectrochemical UV Detector Based on Anodized TiO2-Nanotubes@Ti@quartz Structure

“…The iodine-based electrolyte contained 1.12 g of 1.3-dimethylimidazole iodide, 0.038 g of iodine, 0.06 g of guanidine thiocyanate, 0.34 g of tert-butyl pyridine, 0.0335 g of lithium iodide, 4.25 mL of acetonitrile, and 0.75 mL of butyl cyanide. See previous works for more details [ 30 , 31 ].…”

Electrochemical and Mechanical Properties of Hexagonal Titanium Dioxide Nanotubes Formed by Sonoelectrochemical Anodization

“…The porosity of the analyzed hexagonal structures increased with the increasing diagonality of the hTNTs; that is, for the hTNTs samples with a similar height of 3500-4000 nm, a diagonal increase caused a decrease in porosity (Table 3). The equivalent circuit [49][50][51][52] shown in Figure 3g was fitted to the EIS results for compact and hexagonal TiO2 (Figure 3), and the fit parameters are listed in Table 4. The components of this equivalent circuit are the electrolyte resistance (Rs), resistance (R1), and admittance (constant phase element, CPE1) of the outer tube layer (R1) and the resistance (R2) and admittance (CPE2) of the barrier layer [49].…”

“…The values of Rs and R1 correlate with the diagonality of hTNTs in 3.5% NaCl and Ringer's solutions, and their values are similar to those of the compact TiO2 layer. The increased diagonal of the hTNTs increases the electric resistance due to the solution bulk between the electrodes (Rs) and a better corrosion re- The equivalent circuit [49][50][51][52] shown in Figure 3g was fitted to the EIS results for compact and hexagonal TiO 2 (Figure 3), and the fit parameters are listed in Table 4. The components of this equivalent circuit are the electrolyte resistance (Rs), resistance (R1), and admittance (constant phase element, CPE1) of the outer tube layer (R1) and the resistance (R2) and admittance (CPE2) of the barrier layer [49].…”

Ultrathin CuBi2O4 on a bipolar Bi2O3 nano-scaffold: a self-powered broadband photoelectrochemical photodetector with improved responsivity and response speed

“…Photoelectrochemical (PEC) photodetectors have received increasing attention due to their low background signal, high sensitivity, fast response, low cost, and simple fabrication process (no lithography required). [1][2][3][4][5][6] In particular, selfpowered broadband PEC photodetectors, which can achieve a wide spectral range response covering UV to NIR light without an external power source, have become a research hotspot. [7][8][9][10][11] They are attractive in special application scenarios such as wireless, wearable, and micro-photodetectors.…”