Size-Controlled Anatase Titania Single Crystals with Octahedron-like Morphology for Dye-Sensitized Solar Cells

Shiu, Jia-Wei; Lan, Chi-Ming; Chang, Yu‐Cheng; Wu, Hui-Ping; Huang, Wei‐Kai; Diau, Eric Wei‐Guang

doi:10.1021/nn3042418

Cited by 85 publications

(73 citation statements)

References 59 publications

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“…This is because the increase in H + concentration reduces the surface energy of {001} facet to be lower than that of {101} facet, limiting the crystal growth along [001] and causing a larger percentage of {001} facet. [17,19] The samples resulted from these synthetic conditions have been assigned as {101}-{001}-2 and {101}-{001}-3, respectively. On the other hand, the particles are constructed by rectangle {010} and square {001} facets with an interfacial angle of 90°when the amount of F À in the system was increased (AFT was increased from 400 mg to 600 mg), as shown in the lower row of Figure 1a 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 and 62.6 (PDF-01-070-8505), respectively.…”

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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Section: Resultsmentioning

confidence: 99%

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

et al. 2020

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“…We take the view that three‐dimensional (3D) hyperbranched nanowire architectures with high surface area, low defect density, and a 3D interconnection network for electron extraction can be the basis of effective ETMs for mesostructured photovoltaics. Efforts have been deployed to develop 3D hierarchical branched nanowire architectures, as these are of great interest to a wide range of applications including photocatalysis, energy storage, and photovoltaics . Different methods of synthesizing 3D hyperbranched TiO 2 nanowires have included vapor deposition, pulsed‐laser deposition, and hydrothermal methods .…”

Section: Summary Of Device Parameters Obtained For Mesostructured Permentioning

confidence: 99%

Highly Efficient Hybrid Photovoltaics Based on Hyperbranched Three‐Dimensional TiO₂ Electron Transporting Materials

2015

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Seed-induced multistep and one-step hydrothermal methods have been successfully used by Lee et al. [ 31 ] and Wu et al. [ 15 ] to fabricate hyperbranched TiO 2 nanostructures with improved light harvesting in DSSCs owing to their larger surface area. However, these synthesis methods have resulted in a low density of nanofi bers, [ 15,31 ] and have suffered from slow carrier transport due to the presence of structural defects, including at grain boundaries between the nanofi ber trunks and nanorod branches of the hyperbranched ETM. Electrospinning of metal oxide nanofi bers has recently emerged as a potentially inexpensive, rapid, facile, and versatile route to growing 1D TiO 2 nanomaterials on a variety of substrates, [ 40,41 ] and has been investigated as a 1D material in the context of DSSCs. [42][43][44] However, the combination of electrospun TiO 2 fi bers with hydrothermally grown TiO 2 branches has not been investigated in the contexts of DSSCs or PSCs. [ 45 ] In this communication, we introduce a unique and scalable multistage electrospinning and hydrothermal route for the development of 3D hyperbranched anatase TiO 2 nanorodnanofi ber arrays as electron transporting materials. The hyperbranched ETM with optimal electron transport and carrier lifetime leads to highly effi cient mesostructured perovskite (CH 3 NH 3 PbI 3 ) solar cells with an average power conversion effi ciency (PCE avg ) of 15.03% and a maximum power conversion effi ciency (PCE max ) of 15.50%. Increasing the thickness of the hyperbranched ETM from 0.6 µm to ≈29 µm led to highly effi cient DSSCs as well, with PCE max = 11.22%. These remarkable performances were possible thanks to the development of 3D hyperbranched nanofi ber-nanorod arrays made of high quality anatase TiO 2 with few defects and capable of transporting electrons rapidly and over long distances, minimizing recombination losses. Light harvesting was also found to be signifi cantly enhanced due to light scattering effects of the hyperbranched architecture, leading to signifi cant performance boosts in DSSCs. This work demonstrates remarkable advantages in using hyperbranched ETMs for highly effi cient, largearea, and low-cost hybrid photovoltaics.In Figure 1 a, we show scanning electron micrographs (SEM) of nanofi bers obtained by electrospinning of a fi rst layer without subsequent hydrothermal synthesis of nanorod branches (E 1 H 0 ). We have carefully selected the electrospinning conditions, such as the applied voltage, the solution viscosity, and fl ow rate, in order to obtain nanofi bers assembled from small TiO 2 nanoparticles (40-50 nm diameter) and exhibiting significant internal porosity within the nanofi bers (see the Supporting Information). The formation of mesoporous nanofi bers is also an important requirement to obtaining hierarchically mesostructured nanofi ber-nanorod arrays during the subsequent Solution-processed hybrid thin fi lm photovoltaic technologies, such as perovskite solar cells (PSCs), dye sensitized solar cells (DSSCs), and colloidal quantum dot...

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“…To achieve higher performance photovoltaic solar cells, morphologies and structures of anode materials are also widely investigated [4]. In general, mesoporous TiO 2 nanoparticles are the most frequently used photoanodes in DSSCs and QDSSCs, due to their high internal surface area for sufficient sensitizer anchoring [5]. Unfortunately, mesoporous TiO 2 nanoparticles have some disadvantages, such as charge collection rate due to surface states and grain boundaries existing in the pathway of nanoparticles, which can lead to many unexpected trapping and detrapping, and thus, inferior light scattering [6].…”

Section: Introductionmentioning

confidence: 99%

Dynamic study of bismuth telluride quantum dot assisted titanium oxide for efficient photoelectrochemical performance

Pallavi¹,

Vijay²,

Kishorkumar³

et al. 2016

Nanosystems: Phys. Chem. Math.

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Size-Controlled Anatase Titania Single Crystals with Octahedron-like Morphology for Dye-Sensitized Solar Cells

Cited by 85 publications

References 59 publications

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

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

Highly Efficient Hybrid Photovoltaics Based on Hyperbranched Three‐Dimensional TiO₂ Electron Transporting Materials

Dynamic study of bismuth telluride quantum dot assisted titanium oxide for efficient photoelectrochemical performance

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Size-Controlled Anatase Titania Single Crystals with Octahedron-like Morphology for Dye-Sensitized Solar Cells

Cited by 85 publications

References 59 publications

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

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

Highly Efficient Hybrid Photovoltaics Based on Hyperbranched Three‐Dimensional TiO2 Electron Transporting Materials

Dynamic study of bismuth telluride quantum dot assisted titanium oxide for efficient photoelectrochemical performance

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

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

Highly Efficient Hybrid Photovoltaics Based on Hyperbranched Three‐Dimensional TiO₂ Electron Transporting Materials