Nanoforest Nb<sub>2</sub>O<sub>5</sub> Photoanodes for Dye-Sensitized Solar Cells by Pulsed Laser Deposition

Ghosh, Rohit; Brennaman, M. Kyle; Uher, Tim; Ok, Myoung Ryul; Samulski, Edward T.; McNeil, L. E.; Meyer, Thomas J.; López, René

doi:10.1021/am200805x

Cited by 142 publications

(80 citation statements)

References 26 publications

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“…The capability of KBNNO to absorb 3 to 6 times more solar energy than the current ferroelectric materials suggests a route to viable ferroelectric semiconductor-based cells for solar energy conversion and other applications. Although several other oxides or mixed oxides, such as ZnO, SnO 2 , Nb 2 O 5 , and Zn 2 SnO 4 have also been reported as photoanodes for DSSCs, [191][192][193][194][195][196][197][198] these materials always exhibit lower photovoltaic performance compared with DSSCs with TiO 2 . Similar results have also been reported by Zhou et al, 182 and it was observed that KBNNO with compositions of x = 0.1-0.3 have a narrow E bg of below 1.5 eV, which is much smaller than the 3.2 eV BG of the parent KNbO 3 (KNO) due to the increasing Ni 3d electronic states within the gap of KNO.…”

Section: Other Perovskite-based Light Absorbersmentioning

confidence: 99%

Research progress of perovskite materials in photocatalysis- and photovoltaics-related energy conversion and environmental treatment

2015

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Meeting the growing global energy demand is one of the important challenges of the 21st century. Currently over 80% of the world's energy requirements are supplied by the combustion of fossil fuels, which promotes global warming and has deleterious effects on our environment. Moreover, fossil fuels are non-renewable energy and will eventually be exhausted due to the high consumption rate. A new type of alternative energy that is clean, renewable and inexpensive is urgently needed. Several candidates are currently available such as hydraulic power, wind force and nuclear power. Solar energy is particularly attractive because it is essentially clean and inexhaustible. A year's worth of sunlight would provide more than 100 times the energy of the world's entire known fossil fuel reserves. Photocatalysis and photovoltaics are two of the most important routes for the utilization of solar energy. However, environmental protection is also critical to realize a sustainable future, and water pollution is a serious problem of current society. Photocatalysis is also an essential route for the degradation of organic dyes in wastewater. A type of compound with the defined structure of perovskite (ABX3) was observed to play important roles in photocatalysis and photovoltaics. These materials can be used as photocatalysts for water splitting reaction for hydrogen production and photo-degradation of organic dyes in wastewater as well as for photoanodes in dye-sensitized solar cells and light absorbers in perovskite-based solar cells for electricity generation. In this review paper, the recent progress of perovskites for applications in these fields is comprehensively summarized. A description of the basic principles of the water splitting reaction, photo-degradation of organic dyes and solar cells as well as the requirements for efficient photocatalysts is first provided. Then, emphasis is placed on the designation and strategies for perovskite catalysts to improve their photocatalytic activity and/or light adsorption capability. Comments on current and future challenges are also provided. The main purpose of this review paper is to provide a current summary of recent progress in perovskite materials for use in these important areas and to provide some useful guidelines for future development in these hot research areas.

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Section: Other Perovskite-based Light Absorbersmentioning

confidence: 99%

Research progress of perovskite materials in photocatalysis- and photovoltaics-related energy conversion and environmental treatment

2015

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“…11a). 44 As can be seen, the APCE of the cells varies in the same trend with IPCE in the wavelength range with 1/N719 > 2/N719 > N719. Meanwhile, the absorption of N719 is compensated by the complexes, which leads to an enhanced light harvesting efficiency.…”

Section: Photovoltaic Properties Of Dsscsmentioning

confidence: 67%

Advanced Cd^II complexes as high efficiency co-sensitizers for enhanced dye-sensitized solar cell performance

et al. 2015

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This work reports on two new complexes with the general formula [Cd3(IBA)3(Cl)2(HCOO)(H2O)]n (1) and {[Cd1.5(IBA)3(H2O)6]·3.5H2O}n (2), which can be synthesized by the reaction of Cd(II) with rigid linear ligand 4-HIBA containing imidazolyl and carboxylate functional groups [4-HIBA = 4-(1H-imidazol-1-yl)benzoic acid]. Single-crystal X-ray diffraction analyses indicate that complex 1 is a 2D "wave-like" layer structure constructed from trinuclear units and complex 2 is just a mononuclear structure. Surprisingly, both complexes 1 and 2 appear as a 3D supramolecular network via intermolecular hydrogen bonding interactions. What's more, due to their strong UV-visible absorption, 1 and 2 can be employed as co-sensitizers in combination with N719 to enhance dye-sensitized solar cell (DSSC) performance. Both of them could overcome the deficiency of the ruthenium complex N719 absorption in the region of ultraviolet and blue-violet, and the charge collection efficiency is also improved when 1 and 2 are used as co-sensitizers, which are all in favor of enhancing the performance. The DSSC devices using co-sensitizers of 1/N719 and 2/N719 show an overall conversion efficiency of 8.27% and 7.73% with a short circuit current density of 17.48 mA cm(-2) and 17.39 mA cm(-2), and an open circuit voltage of 0.75 V and 0.74 V, respectively. The overall conversion efficiency is 27.23% and 18.92% higher than that of a device solely sensitized by N719 (6.50%). Consequently, the prepared complexes are high efficiency co-sensitizers for enhancing the performance of N719 sensitized solar cells.

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“…Over several decades, nanostructured metal oxides were synthesized by various vacuum-based synthesis methods such as evaporator, 13,14 sputtering, 15 chemical vapor deposition (CVD), [16][17][18][19] pulsed laser deposition (PLD) 20 and other techniques. Recently, a hydrothermal reaction was practiced to make metal oxide nanostructure z E-mail: maxko@snu.ac.kr as a core material for the hierarchical nanostructure.…”

Section: Synthesis Of Metal Oxide Nanostructure By Hydrothermal Procementioning

confidence: 99%

Perspective—A Brief Perspective on the Fabrication of Hierarchical Nanostructure for Solar Water Splitting Photoelectrochemical Cells

Kwon

Cho

Lee

et al. 2018

ECS J. Solid State Sci. Technol.

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Among various solar energy generation methods, a water splitting photoelectrochemical (PEC) cell have been anticipated as a one of the promising source to generate hydrogen by natural sunlight. Owing to unique electrical, electrochemical and optical properties, the nanostructured metal oxides were intensively investigated to adopt as a main material in the water splitting PEC cell. However, most of nanostructured metal oxides have an improper bandgap size/position for splitting water molecule, it needs to be engineered to shift a level of the energy bandgap. In this prospective review, we will briefly discuss solution-processed fabrication methods for water splitting applications. Current StatusSunlight-driven energy generation systems have been broadly studied to establish a clean and sustainable energy source. Water splitting photoelectrochemical (PEC) cell is one of the next-generation hydrogen generation technology.1-3 Since metal oxides have unique electrical, electrochemical and optical properties, it usually was adopted as a main material for the water splitting PEC cell. At this time, the metal oxides were fabricated to have nanoscale structure. Typically, the nanostructured materials have different chemical, electrical and optical characteristics, largely depended on the size. 4 One of the featured characteristics for the nanoscale materials is large surface to volume ratio, which indicates that it offers many chemical reaction sites. Moreover, the nanostructured materials own minimized defects and shortened migration distance for electrons/holes, which decreases electron-hole recombination and eventually leads high photoresponse efficiency.5 Nanomaterials were engineered as various shapes and structures such as thin film, 6 porous frameworks, 7,8 nature-mimicked branched systems 9,10 and hierarchical structures 11,12 to obtain maximize surface areas. Among the various structures, the hierarchical metal oxide nanostructure has been broadly studied for the electrochemical applications due to a simple structure form as well as a capability of modulation for the electrical property. Regarding the hierarchical structure is basically consisted of an inner core and an outer surrounding, the core material fabrication process firstly needs to be determined. At the early stage of research, metal oxide-based hierarchical nanostructures were generally synthesized via vapor-liquid-solid process, mostly conducted under vacuum environment. However, several pioneer researchers have introduced a hybrid fabrication process using both dry and wet methods to get hierarchical nanostructure. Synthesis of Metal Oxide Nanostructure by Hydrothermal Process for Water Splitting ApplicationsOver several decades, nanostructured metal oxides were synthesized by various vacuum-based synthesis methods such as evaporator, 13,14 sputtering, 15 chemical vapor deposition (CVD), [16][17][18][19] pulsed laser deposition (PLD) 20 and other techniques. Recently, a hydrothermal reaction was practiced to make metal oxide nanostructure z E-mai...

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Nanoforest Nb₂O₅ Photoanodes for Dye-Sensitized Solar Cells by Pulsed Laser Deposition

Cited by 142 publications

References 26 publications

Research progress of perovskite materials in photocatalysis- and photovoltaics-related energy conversion and environmental treatment

Research progress of perovskite materials in photocatalysis- and photovoltaics-related energy conversion and environmental treatment

Advanced Cd^II complexes as high efficiency co-sensitizers for enhanced dye-sensitized solar cell performance

Perspective—A Brief Perspective on the Fabrication of Hierarchical Nanostructure for Solar Water Splitting Photoelectrochemical Cells

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Nanoforest Nb2O5 Photoanodes for Dye-Sensitized Solar Cells by Pulsed Laser Deposition

Cited by 142 publications

References 26 publications

Research progress of perovskite materials in photocatalysis- and photovoltaics-related energy conversion and environmental treatment

Research progress of perovskite materials in photocatalysis- and photovoltaics-related energy conversion and environmental treatment

Advanced CdII complexes as high efficiency co-sensitizers for enhanced dye-sensitized solar cell performance

Perspective—A Brief Perspective on the Fabrication of Hierarchical Nanostructure for Solar Water Splitting Photoelectrochemical Cells

Contact Info

Product

Resources

About

Nanoforest Nb₂O₅ Photoanodes for Dye-Sensitized Solar Cells by Pulsed Laser Deposition

Advanced Cd^II complexes as high efficiency co-sensitizers for enhanced dye-sensitized solar cell performance