High Efficiency Dye-sensitized Solar Cells Constructed with Composites of TiO2 and the Hot-bubbling Synthesized Ultra-Small SnO2 Nanocrystals

Mao, Xinyu; Zhou, Ru; Zhang, Shouwei; Ding, Liping; Wan, Lei; Qin, Shengxian; Chen, Zhe‐Sheng; Xu, Jinzhang; Miao, Shiding

doi:10.1038/srep19390

Cited by 66 publications

(27 citation statements)

References 45 publications

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“…The higher frequency semicircle (10 kHz to 100 Hz for (sub)monolayer electrode, 10 kHz to 25 Hz for the via GelVIP produced photoelectrode) is widely known to be based on the transfer of trapped charge carriers across the particle–electrolyte and the particle–electrode interface . The semicircle at lower excitation frequencies (25 to 1 Hz for xerogel coated electrode) is based on the charge transport across the nanoparticle network . Moreover, IMPS spectroscopy of 100 printing cycles produced films of printed CdSe/CdS nanoink only (blue circles, film thickness 1 µm ± 0.24 µm) and CdSe/CdS xerogel network (green squares) were conducted.…”

Section: Resultsmentioning

confidence: 99%

Patterning of Nanoparticle‐Based Aerogels and Xerogels by Inkjet Printing

Lübkemann

Miethe

Steinbach

et al. 2019

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Nanoparticle‐based voluminous 3D networks with low densities are a unique class of materials and are commonly known as aerogels. Due to the high surface‐to‐volume ratio, aerogels and xerogels might be suitable materials for applications in different fields, e.g. photocatalysis, catalysis, or sensing. One major difficulty in the handling of nanoparticle‐based aerogels and xerogels is the defined patterning of these structures on different substrates and surfaces. The automated manufacturing of nanoparticle‐based aerogel‐ or xerogel‐coated electrodes can easily be realized via inkjet printing. The main focus of this work is the implementation of the standard nanoparticle‐based gelation process in a commercial inkjet printing system. By simultaneously printing semiconductor nanoparticles and a destabilization agent, a 3D network on a conducting and transparent surface is obtained. First spectro‐electrochemical measurements are recorded to investigate the charge–carrier mobility within these 3D semiconductor‐based xerogel networks.

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Section: Resultsmentioning

confidence: 99%

Patterning of Nanoparticle‐Based Aerogels and Xerogels by Inkjet Printing

Lübkemann

Miethe

Steinbach

et al. 2019

Small

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“…Furthermore, a strong correlation of J sc and EQE is found. Additionally, the enhancements in the EQE values may suggest more dye molecules adsorbed on the photoanodes which are bound to DNA molecule through a phosphonate anchor and larger specific surface area as shown in Figure . W@TiO 2 photoanode based DSSC has the highest percentage of charge transportation in visible region while bare@TiO 2 photoanode based DSSC has the lowest one in whole spectrum.…”

Section: Resultsmentioning

confidence: 99%

An Effective Approach for High‐Efficiency Photoelectrochemical Solar Cells by Using Bifunctional DNA Molecules Modified Photoanode

Sönmezoğlu

Akın

Terzi

et al. 2016

Adv Funct Materials

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wileyonlinelibrary.comadsorption and relatively high recombination rate via vacant sites that significantly restrict the photoconversion efficiency (PCE). Therefore, researchers are faced with the challenge of developing efficient suppression routes by designing this component with an efficient charge transport pathway. Although some approaches were reported to suppress the charge recombinations occurring at the TiO 2 /dye interface including the use of inorganic [3,4] as well as polymer-assisted materials, [5][6][7] there are still some practical limitations due to the poor light absorption, low surface area, and slow electron injection. To overcome these limitations, extensive research efforts are directed toward DSSC applications of functionalized photoanode electrodes with novel interface modifiers and toward the design of solar cells. An appropriate interface modifier can play the role of assisting charge separation and also effectively shield the unfavorable reactions which occur from the injected electrons in photoanode's conduction band (CB) to the I 3 − ions in electrolyte and/or to the holes in highest occupied molecular orbital (HOMO) level of the dye. [8] Among modifier layers, thin tunneling barrier (TTB) at TiO 2 /dye interface is one of the most efficient and feasible ways, because TTB material is preferred in such a way that its CB is more positive than that of TiO 2 to form an energy barrier which allows electron injection but hinders the recombination reactions as well as passivate the surface states known as the vacant sites.Since then, many groups have attempted to modify photoanode in this system using alternative materials. [5,9,10] However, it has still not been reached to the desired PCE due to lower electron transport efficiency and sensitizing ability, much faster recombination, and difficult bind with TiO 2 or dyes. Alternative to these molecules, deoxyribonucleic acid (DNA) molecules have attracted research interest as modifier and/or linker because of cost effectiveness/easy fabrication, absorption ability in UV region causing high intersystem quantum yield, and favorable energy levels (HOMO: −5.2 eV; LUMO: −1.1 eV) [11][12][13] to inject charge, its 3D double helix structure confines the entered photons, and these photons snatch electrons after each collision with DNA molecules. This double helix structure is also beneficial for sunlight utilization from all directions. [14] This paper firstly reports the effect of deoxyribonucleic acid (DNA) molecules extracted from chickpea and wheat plants on the injection/recombination of photogenerated electrons and sensitizing ability of dye-sensitized solar cells (DSSCs). These high-yield DNA molecules are applied as both linker bridging unit as well as thin tunneling barrier (TTB) at titanium dioxide (TiO 2 )/dye interface, to build up high-efficient DSSCs. With its favorable energy levels, effective linker bridging role, and double helix structure, bifunctional DNA modifier shows an efficient electron injection, suppressed charge recombinati...

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“…IMPS results reveal that generally the mean transit times (τ tr ) of photogenerated e − resulted from {101}‐{001}‐1, {101}‐{001}‐2, and {101}‐{001}‐3 are 0.28, 0.18, and 0.10 ms, respectively. The shorter τ tr indicates the more efficient e − transport from the material films to the FTO substrate which acts as the current collector . Superior charge transport efficiency of {101}‐{001}‐3 could contribute to the highest photocurrent density achieved among the same set of samples constructed by {101}‐{001} facet pair.…”

Section: Resultsmentioning

confidence: 99%

Effects of Matching Facet Pairs of TiO₂ on Photoelectrochemical Water Splitting Behaviors

et al. 2020

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Engineering crystal facets have been proved as one of the most promising strategies for promoting photocatalytic performance of titanium dioxide (TiO2). The earlier research in this field focused on trying to obtain as high ratio of the high energy {001} facet as possible, while later found that the co‐existence of facets is more beneficial. However, controlling crystals to expose suitable facet pairs and facet ratios remains challenging. In this work, we not only comprehensively match possible low‐index facets such as {101}‐{001} and {010}‐{001} facet pairs, but also systematically tune their ratios. Moreover, these faceted particles can be directly grown onto the transparent conductive substrate, which can be directly used as a photoanode. So, their intrinsic behaviors can be precisely evaluated without interference from other exogenous factors such as binders, additives, or assembly skills. Various characterization techniques reveal that both the types of facet pairs and the ratios of facets play crucial roles on photocatalytic behaviors, due to the different electron affinity and dissociative adsorption ability of water molecules on a particular facet. Charge transport and surface chemistry have been thoroughly investigated to identify the underlying mechanism. This work sheds light on a material design strategy considering a suitable match of facet pairs for optimizing photocatalytic performance for a wide variety of applications.

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High Efficiency Dye-sensitized Solar Cells Constructed with Composites of TiO2 and the Hot-bubbling Synthesized Ultra-Small SnO2 Nanocrystals

Cited by 66 publications

References 45 publications

Patterning of Nanoparticle‐Based Aerogels and Xerogels by Inkjet Printing

Patterning of Nanoparticle‐Based Aerogels and Xerogels by Inkjet Printing

An Effective Approach for High‐Efficiency Photoelectrochemical Solar Cells by Using Bifunctional DNA Molecules Modified Photoanode

Effects of Matching Facet Pairs of TiO₂ on Photoelectrochemical Water Splitting Behaviors

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High Efficiency Dye-sensitized Solar Cells Constructed with Composites of TiO2 and the Hot-bubbling Synthesized Ultra-Small SnO2 Nanocrystals

Cited by 66 publications

References 45 publications

Patterning of Nanoparticle‐Based Aerogels and Xerogels by Inkjet Printing

Patterning of Nanoparticle‐Based Aerogels and Xerogels by Inkjet Printing

An Effective Approach for High‐Efficiency Photoelectrochemical Solar Cells by Using Bifunctional DNA Molecules Modified Photoanode

Effects of Matching Facet Pairs of TiO2 on Photoelectrochemical Water Splitting Behaviors

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Effects of Matching Facet Pairs of TiO₂ on Photoelectrochemical Water Splitting Behaviors