Well-crystalline porous ZnO–SnO2 nanosheets: An effective visible-light driven photocatalyst and highly sensitive smart sensor material

Lamba, Randeep; Umar, Ahmad; Mehta, S.K.; Kansal, Sushil Kumar

doi:10.1016/j.talanta.2014.07.096

Cited by 109 publications

(44 citation statements)

References 51 publications

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“…Some recent reports have focused on nanocomposite photo-anodes and their more efficient electron-hole separation. 26 Many investigators have exploited different synthetic methods to prepare Zn 1Àx Sn x O nanocomposites including multistep solvent-based routes such as co-precipitation, [27][28][29] which is used in this study, hydrothermal 30,31 and sol-gel. 32,33 However, to the best of our knowledge, only a few articles have focused on ss-DSSCs with nanocomposite photo-anodes, 34,35 which reported low efficiencies of up to 0.34 and 0.5% for ss-DSSCs based on ZnO only.…”

Section: Introductionmentioning

confidence: 99%

Solid-state dye-sensitized solar cells based on Zn_1−xSn_xO nanocomposite photoanodes

et al. 2018

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Solid-state dye-sensitized solar cells (ss-DSSCs) comprising Sn 2+ -substituted ZnO nanopowder were purposefully tailored via a co-precipitation method. The solar cells assembled in this work were sensitized with N719 ruthenium dye and insinuated with spiro-OMeTAD as a solid hole transport layer (HTL). Evidently, significant enhancement in cell efficiency was accomplished with Sn 2+ ions-substituted ZnO photoelectrodes by maintaining the weight ratio of SnO at 5%. The overall power conversion efficiency was improved from 3.0% for the cell with pure ZnO to 4.3% for the cell with 5% SnO substitution. The improvement in the cell efficiency with Sn 2+ -substituted ZnO photoelectrodes is attributed to the considerably large surface area of the nanopowders for dye adsorption, efficient charge separation and the suppression of charge recombination provided by SnO. Furthermore, the energy distinction between the conduction band edges of SnO and ZnO implied a type II band alignment.Moreover, the durability as well as the stability of 15 assembled cells were studied to show the outstanding long-term stability of the devices made of Sn 2+ ion substituted ZnO, and the PCE of each cell remained stable and $96% of its primary value was retained for up to 100 h. Subsequently, the efficacy was drastically reduced to $35% after 250 h of storage. IntroductionGenerally, the most abundant source of renewable energy is solar energy. 1 To date, single and polycrystalline silicon solar cell technologies have dominated the solar cell market, representing an 80% share.2 However, their growth and mass production are restricted because of their high cost, large energy consumption and contamination generated from silicon-based solar cell fabrication. Therefore, many researchers have developed relatively inexpensive and eco-friendly dyesensitized solar cells (DSSCs) as a substitute for these devices.3 In this context, dye sensitized solar cells are the most favorable devices for efficient conversion of light to electricity because of their low production expenditure and simple fabrication.4-7 To date, the certied efficiency record for DSSCs is approximately 11.1% for a small cell, and large-scale tests have evidenced the great need for their commercialization. Furthermore, these cells are heavy, prone to leakage and have complex chemistry. 9,10 Accordingly, many attempts have been focused on the use of solid-state hole transporting materials (HTMs) to achieve practicability of DSSCs. In this regard, there are many different hole transport materials (conjugated polymers) including pentacene, 11 poly(triphenyldiamine), 12 polythiophene, 13 and poly (3-hexylthiophene) (P3HT), 14 which can induce charge carrier generation in ss-DSSCs. The most widely utilized hole transfer layer (HTL) is 2,2 0 ,7,7 0 -tetrakis-(N,N-di-pmethoxyphenylamine)-9,9 0 -spirobiuorene, also known as a spiro-MeOTAD, 15 due to its ability to be deposited from solution using different techniques. In 1998, the rst solid-state DSSCs were developed by Bach et al.;16 they d...

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Section: Introductionmentioning

confidence: 99%

Solid-state dye-sensitized solar cells based on Zn_1−xSn_xO nanocomposite photoanodes

et al. 2018

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“…Our work is focused on the review of photocatalytic properties of composite nanostructures of ZnO with CdS [81,126,127,145,[148][149][150][151][152][153][154][155][156][157][158][159][160][161][162][163][164][165][166], TiO 2 [167][168][169][170][171][172][173][174][175][176][177], SnO [178], SnO 2 [179][180][181][182][183][184][185][186][187][188][189][190][191][192][193]…”

Section: Photocatalysis By Zno Nanocompositeunclassified

Photocatalysis and Bandgap Engineering Using ZnO Nanocomposites

Johar

Afzal

Alazba

et al. 2015

Advances in Materials Science and Engineering

126

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Nanocomposites have a great potential to work as efficient, multifunctional materials for energy conversion and photoelectrochemical reactions. Nanocomposites may reveal more improved photocatalysis by implying the improvements of their electronic and structural properties than pure photocatalyst. This paper presents the recent work carried out on photoelectrochemical reactions using the composite materials of ZnO with CdS, ZnO with SnO 2 , ZnO with TiO 2 , ZnO with Ag 2 S, and ZnO with graphene and graphene oxide. The photocatalytic efficiency mainly depends upon the light harvesting span of a material, lifetime of photogenerated electron-hole pair, and reactive sites available in the photocatalyst. We reviewed the UV-Vis absorption spectrum of nanocomposite and photodegradation reported by the same material and how photodegradation depends upon the factors described above. Finally the improvement in the absorption band edge of nanocomposite material is discussed.

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“…It can clearly be seen that the current increases gradually with increase in the concentration of thiourea. This continuous increase may be attributed to the generation of a large number of ions and increase in the ionic strength with the addition of thiourea [14]. Further, the current was calibrated in order to estimate the sensitivity of the fabricated thiourea chemical sensor and the plot of calibrated current versus thiourea concentrations is shown in Fig.…”

Section: Thiourea Chemical Sensor Application Of Sb 2 O 3 -Zno Nanospmentioning

confidence: 99%

“…Zinc oxide (ZnO) with an optical band gap of 3.3 eV has been widely studied [11] due to its unique optoelectronic properties and applications for photocatalysis [12,13], sensors [14,15], solar cells [16,17], photodetectors [18], light emitting diodes [19], photodiodes [20], etc. On the other hand, antimony oxide (Sb 2 O 3 ) with a wide band gap of 3.4 eV, has also being used in various applications as catalyst [21], flame retardant [22][23][24], optoelectronic and photoelectric devices [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Sb2O3–ZnO nanospindles: A potential material for photocatalytic and sensing applications

Lamba

Mehta

Kansal

2015

Ceramics International

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Well-crystalline porous ZnO–SnO2 nanosheets: An effective visible-light driven photocatalyst and highly sensitive smart sensor material

Cited by 109 publications

References 51 publications

Solid-state dye-sensitized solar cells based on Zn_1−xSn_xO nanocomposite photoanodes

Solid-state dye-sensitized solar cells based on Zn_1−xSn_xO nanocomposite photoanodes

Photocatalysis and Bandgap Engineering Using ZnO Nanocomposites

Sb2O3–ZnO nanospindles: A potential material for photocatalytic and sensing applications

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Well-crystalline porous ZnO–SnO2 nanosheets: An effective visible-light driven photocatalyst and highly sensitive smart sensor material

Cited by 109 publications

References 51 publications

Solid-state dye-sensitized solar cells based on Zn1−xSnxO nanocomposite photoanodes

Solid-state dye-sensitized solar cells based on Zn1−xSnxO nanocomposite photoanodes

Photocatalysis and Bandgap Engineering Using ZnO Nanocomposites

Sb2O3–ZnO nanospindles: A potential material for photocatalytic and sensing applications

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Solid-state dye-sensitized solar cells based on Zn_1−xSn_xO nanocomposite photoanodes

Solid-state dye-sensitized solar cells based on Zn_1−xSn_xO nanocomposite photoanodes