Synthesis of Porous Nickel Oxide Nanofiber

Nakasa, Akihiko; Suzuki, Eiji; Usami, Hisanao; Fujimatsu, Hitoshi

doi:10.1246/cl.2005.428

Cited by 15 publications

(20 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This suggests that at small applied biases (close to JSC) the overpotential for electrolyte reduction at the cathode is sufficiently large that the system is driven by the photoanode. This phenomenon has also been observed by other authors when the photoelectrodes are not current matched [28,29], but the maximum power point seems to inevitably reside in a voltage range where both photoelectrodes are the primary elements driving current flow (rather than dark processes). Developments in pDSC device efficiency are addressed below in Section 2.1 and show a rapid and dramatic increase since this first report.…”

Section: Incident Photon To Charge Carrier Efficiency -Ipce) Using Ansupporting

confidence: 81%

“…The first paper on pDSCs, as discussed above, reported only very low efficiencies [5]. The next report on pDSC did not appear for another 6 years, when Nakasa et al applied Coumarin 343 (C343) as a sensitizer [29].…”

Section: Overview Of Pdsc Developmentmentioning

confidence: 96%

“…Device performance was severely limited by the interfacial charge recombination reactions occurring between the reduced sensitizer and the injected holes. One of the first dyes applied in pDSCs [29].…”

Section: Sensitizersmentioning

confidence: 99%

See 2 more Smart Citations

Developments in and prospects for photocathodic and tandem dye-sensitized solar cells

Nattestad¹,

Perera²,

Spiccia³

2016

Journal of Photochemistry and Photobiology C: Photochemistry Re

View full text Add to dashboard Cite

Third generation photovoltaics are based on the concept of providing high conversion efficiencies with low device production costs. As such, second generation concepts, such as Dye-sensitized Solar Cells (DSCs), serve as a good starting point for the development of these new devices. Tandem DSC devices are one example of such a concept, and can be constructed using two photoactive electrodes (one photoanode and one photocathode) inside the one cavity, increasing the theoretical efficiency limit by around 50% as compared to the conventional design. As there has been substantial effort devoted to the development of ntype DSCs, the focus of researchers investigating tandem DSCs has been to create high performance p-type systems, which operate by an analogous, but inverted, mechanism to n-type DSCs.

show abstract

Section: Incident Photon To Charge Carrier Efficiency -Ipce) Using Ansupporting

confidence: 81%

Section: Overview Of Pdsc Developmentmentioning

confidence: 96%

See 1 more Smart Citation

Developments in and prospects for photocathodic and tandem dye-sensitized solar cells

Nattestad¹,

Perera²,

Spiccia³

2016

Journal of Photochemistry and Photobiology C: Photochemistry Re

View full text Add to dashboard Cite

show abstract

“…The proof of concept of this strategy has been reported in 2000, using N719 as a sensitizer on TiO 2 for the photoanode and erythrosine B as a sensitizer on NiO for the photocathode [98]. The performance of this system has been improved by more than 50% (from η = 0.39% to 0.66% under air mass (AM) 1.5) by using a mesoporous NiO film of higher quality [99].…”

Section: P-type Inorganic Hole Transport Materials For Pscsmentioning

confidence: 99%

“…Recently, significant improvements on NiO-based PSCs were made by doping the NiO thin film or modifying the NiO/perovskite interface heterojunction [98][99][100][101][102]. Kim et al demonstrated a high-efficiency planar PSC by using solution-processed copper (Cu)-doped NiO x (Cu:NiO x ) as a HTM [122].…”

Section: Planar Nio-based P-i-n Pscsmentioning

confidence: 99%

Inorganic p-Type Semiconductors: Their Applications and Progress in Dye-Sensitized Solar Cells and Perovskite Solar Cells

Yum

Moon

et al. 2016

Energies

View full text Add to dashboard Cite

Considering the increasing global demand for energy and the harmful ecological impact of conventional energy sources, it is obvious that development of clean and renewable energy is a necessity. Since the Sun is our only external energy source, harnessing its energy, which is clean, non-hazardous and infinite, satisfies the main objectives of all alternative energy strategies. With attractive features, i.e., good performance, low-cost potential, simple processibility, a wide range of applications from portable power generation to power-windows, photoelectrochemical solar cells like dye-sensitized solar cells (DSCs) represent one of the promising methods for future large-scale power production directly from sunlight. While the sensitization of n-type semiconductors (n-SC) has been intensively studied, the use of p-type semiconductor (p-SC), e.g., the sensitization of wide bandgap p-SC and hole transport materials with p-SC have also been attracting great attention. Recently, it has been proved that the p-type inorganic semiconductor as a charge selective material or a charge transport material in organometallic lead halide perovskite solar cells (PSCs) shows a significant impact on solar cell performance. Therefore the study of p-type semiconductors is important to rationally design efficient DSCs and PSCs. In this review, recent published works on p-type DSCs and PSCs incorporated with an inorganic p-type semiconductor and our perspectives on this topic are discussed.

show abstract

A p‐Type NiO‐Based Dye‐Sensitized Solar Cell with an Open‐Circuit Voltage of 0.35 V

et al. 2009

View full text Add to dashboard Cite

In 2000, He et al. reported that the combination of a NiObased photoactive cathode with a TiO 2 -based photoanode produced a tandem device with an open-circuit voltage (V OC ) of 0.73 V, [1] which is the sum of the open-circuit potentials of the separate devices, where the TiO 2 -based electrode contributed 0.65 V and the NiO-based electrode 0.08 V. Tandem dye-sensitized solar cells (TDSCs), such as Hes, have suffered from the lack of research directed at the optimization of the photocathode, despite the potential they hold in developing higher voltage devices. Only recently have researchers begun to address issues associated with NiObased DSCs, such as low short-circuit photocurrents (J SC ) and poor fill factors (FF). [2][3][4][5][6] We present herein a three-fold increase in V OC (0.35 V), while maintaining a J SC of 1.7 mA cm À2 , for a p-type NiO dye-sensitized solar cell (p-DSC) employing a carefully designed "dyad" sensitizer and a cobalt-based redox mediator. We have almost quadrupled the p-DSC conversion efficiency from the previous record, 0.055 %, [4] to 0.20 %. Interestingly, the improvements within the p-DSCs translate to improvements in TDSC performance, namely achieving a V OC of 0.91 V, a FF of 0.62, and an efficiency of 0.55 %. The results reported herein present the most significant increase in photovoltaic effi-ciency of p-DSCs to date, emphasizing the importance of molecular engineering in sensitizer and redox-mediator development to achieve substantial gains in DSC performance.A schematic representation of a TDSC is shown in Figure 1. Absorption of light by the sensitizers, in separate photo-processes, causes an electron to be injected into the conduction band (CB) of the TiO 2 at the anode and a hole to be injected into the NiO at the cathode. These charges diffuse through the respective semiconductors to the SnO 2 :F charge collector. To complete the circuit, the oxidized and reduced forms of the redox mediator regenerate the dye at the cathode and anode, respectively.Often DSCs have a counter electrode of platinized conducting glass. In p-type devices, the V OC is the potential energy difference between the quasi-Fermi level close to the valence band (VB) and the Nernstian potential of the redox mediator. [7] Efforts to improve the V OC of TiO 2 -based n-type DSCs (n-DSCs) have involved modifications to the electrolyte [8,9] and doping of the semiconductor itself. [10,11] The various redox couples suffered from slow regeneration kinetics [12,13] or fast recombination with the semiconductor, [14] as a result the I À /I 3 À mediator, though problematic, has prevailed as the electrolyte of choice for n-DSCs. Previously, the p-side in a TDSC contributed little to the overall tandem performance, owing to the low V OC , in the presence of I À /I 3 À , and the low photocurrent. We report herein our rationaldesign effort directed at improving p-DSC performance.We present three p-DSCs composed of a cobalt mediator and three different sensitizing dyes: coumarin 343 (C343), a typical sensitizer for p...

show abstract

Synthesis of Porous Nickel Oxide Nanofiber

Cited by 15 publications

References 12 publications

Developments in and prospects for photocathodic and tandem dye-sensitized solar cells

Developments in and prospects for photocathodic and tandem dye-sensitized solar cells

Inorganic p-Type Semiconductors: Their Applications and Progress in Dye-Sensitized Solar Cells and Perovskite Solar Cells

A p‐Type NiO‐Based Dye‐Sensitized Solar Cell with an Open‐Circuit Voltage of 0.35 V

Contact Info

Product

Resources

About