Ferroelectric polyoxometalate-modified nano semiconductor TiO₂for increasing electron lifetime and inhibiting electron recombination in dye-sensitized solar cells

Abstract

<p>It is known that the electron-holes recombination exsisting in the Dye-sensitized solar cells (DSSCs) limits the increasing of the efficiency of the cells. Finding suitable materials to modify TiO2 semiconductor...</p>

Characterization of polyoxometalate/polymer photo‐composites: A toolbox for the photodegradation of organic pollutants

“…Recently, additional functional properties of POMs have also been reported for different applications such as magnetism, 20 ionic conductivity, 21 photo or electrochromism 22 . More recently, POMs based materials have been used in solar cells and photovoltaic devices, 23 proton conductivity, 24,25 aqueous batteries 26 and photocatalytic oxidation using supramolecular systems 27 …”

“…Recently, additional functional properties of POMs have also been reported for different applications such as magnetism, 20 ionic conductivity, 21 photo or electrochromism. 22 More recently, POMs based materials have been used in solar cells and photovoltaic devices, 23 proton conductivity, 24,25 aqueous batteries 26 and photocatalytic oxidation using supramolecular systems. 27 However, the difficulty in exploiting POMs as functional materials in practical applications stems from their high solubility in aqueous solutions or organic solvents because of their strong Bronsted acid property, that is, H 3 W 12 O 40 (pKa 1 = 1.5; pKa 2 = 3) and H 3 PMo 12 O 40 (pKa = 1.5), 28 which prevents their easy recovery and reuse.…”

Enabling Distributed Intelligence with Ferroelectric Multifunctionalities

“…[ 96 , 97 , 98 ] Thirdly, by making use of the depolarization field in ferroelectrics to promote charge separation and transfer, the efficiency of photovoltaics in other semiconductor materials or their interfaces with the ferroelectric material was substantially improved in the composite structures comprising the semiconductor and ferroelectric materials. [ 99 , 100 , 101 , 102 ] Figure 2c provides several examples about the ferroelectric photovoltaic effect at low dimensions, under visible light, or in the composite with improved charge separation and efficiency by utilizing the depolarization field in a ferroelectric material.…”

Probing the Open-Circuit Voltage Improvement of DSSC via Raman Spectroscopy: In Situ Dynamic Tracking Photoanode/Electrolyte Interfaces

“…Raman spectroscopy is an effective tool for dynamically studying structural evolution, vibrational structures, and heterogeneous interfaces, − and therefore, it is widely used to analyze and characterize materials. − In DSSC cells fabricated using TiO 2 photoanodes, several electron-transfer reactions that are crucial to cell performance, including excited electron injection, conduction electron recombination, and oxidized dye reduction, occur at the interfaces of DSSC. − However, most methods used to characterize DSSC interfaces do not use in situ analysis under ambient working conditions, thus limiting further understanding of DSSC operating mechanisms. In situ Raman spectroscopy is expected to reveal that the interfacial dye state (e.g., oxidation or excited) and electron-transfer considerably influence both DSSC stability and performance …”