Enhanced light harvesting and electron collection in quantum dot sensitized solar cells by TiO2 passivation on ZnO nanorod arrays

Zhao, Haifeng; Wu, Qiang; Hou, Juan; Cao, Haibin; Jing, Qun; Wu, Rong; Li, Yong

doi:10.1007/s40843-016-9008-2

Cited by 27 publications

(13 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…. . [22,23]. It is known that the high-frequency arc corresponds to the charge transfer limiting process, which is attributed to the charge transfer resistance at the contact interface between the electrode and the electrolyte solution.…”

Section: Thermally-assisted Photocatalytic Activity and Degradation Omentioning

confidence: 99%

Thermally-assisted photodegradation of lignin by TiO2/H2O2 under visible/near-infrared light irradiation

Liu

2017

Sci. China Mater.

View full text Add to dashboard Cite

As a bio-recalcitrant organic pollutant in paper mill effluent, lignin is generally removed by an advanced oxidation process, such as a TiO 2 /H 2 O 2 photocatalytic technique under irradiation with ultraviolet light, which only accounts for less than 5% of sunlight. Herein, we reported a TiO 2 /H 2 O 2 -based thermally-assisted photocatalytic process that allows lignin to be efficiently degraded under visible/ near-infrared light at an elevated temperature. Adsorption of H 2 O 2 on TiO 2 nanoparticles and an increase of temperature facilitate the production and separation of charge carriers under near-infrared and visible light irradiation, accelerate carrier transfer at the TiO 2 -electrolyte interface and promote the production of hydroxyl radicals. A higher level of H 2 O 2 addition results in an increased degradation rate of lignin, while the optimal temperature for the thermally-assisted photodegradation of lignin is 70°C. A charge carrier excitation and transfer process was proposed for the TiO 2 /H 2 O 2 thermally-assisted photocatalytic process. This work describes a new method for the photodegradation of organic pollutants, such as residual lignin in paper mill effluent, using wide band gap semiconductors under visible and near-infrared light irradiation.

show abstract

Section: Thermally-assisted Photocatalytic Activity and Degradation Omentioning

confidence: 99%

Thermally-assisted photodegradation of lignin by TiO2/H2O2 under visible/near-infrared light irradiation

Liu

2017

Sci. China Mater.

View full text Add to dashboard Cite

show abstract

“…Covering passivation layer on surface of photoanode is an effective way to lower the surface defects and suppress charge recombination [27,28]. For example, Haifeng Zhao et al [29] modified ZnO nanorods with TiO 2 nanoparticles, and revealed that TiO 2 passivation layer can facilitate the deposition of CdS/CdSe QDs on TiO 2 /ZnO surfaces, and effectively suppress the charge recombination. Lou et al [30] reported a PCE of 1.97% for QDSSCs based on ZnO nanorods passivated with TiO 2 as a barrier layer.…”

Section: Introductionmentioning

confidence: 99%

“…Lou et al [30] reported a PCE of 1.97% for QDSSCs based on ZnO nanorods passivated with TiO 2 as a barrier layer. In view of these backgrounds, it can be found that ZnO surface modification with TiO 2 has attracted interest of researchers to enhance photovoltaic performance of QDSSCs, because of the combination of excellent electron mobility of ZnO and high chemical stability of TiO 2 [29].…”

Section: Introductionmentioning

confidence: 99%

TiO2 Passivation Layer on ZnO Hollow Microspheres for Quantum Dots Sensitized Solar Cells with Improved Light Harvesting and Electron Collection

Wang

et al. 2020

Nanomaterials

View full text Add to dashboard Cite

Light harvesting and electron recombination are essential factors that influence photovoltaic performance of quantum dots sensitized solar cells (QDSSCs). ZnO hollow microspheres (HMS) as architectures in QDSSCs are beneficial in improving light scattering, facilitating the enhancement of light harvesting efficiency. However, this advantage is greatly weakened by defects located at the surface of ZnO HMS. Therefore, we prepared a composite hollow microsphere structure consisting of ZnO HMS coated by TiO2 layer that is obtained by immersing ZnO HMS architectures in TiCl4 aqueous solution. This TiO2-passivated ZnO HMS architecture is designed to yield good light harvesting, reduced charge recombination, and longer electron lifetime. As a result, the power conversion efficiency (PCE) of QDSSC reaches to 3.16% with an optimal thickness of TiO2 passivation layer, which is much higher when compared to 1.54% for QDSSC based on bare ZnO HMS.

show abstract

“…The light absorption performance is higher than other structures, because of the light scattering effect. Therefore, ZnO NAs have been widely used in optoelectronic, electrochemical, and electronic devices, such as nanogenerators [31][32][33][34], sensors [35][36][37][38], light-emitting diodes [39,40], ultraviolet (UV) detectors [41][42][43][44][45], solar cells [46][47][48][49], field emission devices [50,51], and biosensors [52][53][54][55].…”

Section: Introductionmentioning

confidence: 99%

Design and tailoring of patterned ZnO nanostructures for energy conversion applications

Kang

Liao

et al. 2017

Sci. China Mater.

View full text Add to dashboard Cite

ZnO is a typical direct wide-bandgap semiconductor material, which has various morphologies and unique physical and chemical properties, and is widely used in the fields of energy, information technology, biomedicine, and others. The precise design and controllable fabrication of nanostructures have gradually become important avenues to further enhancing the performance of ZnO-based functional nanodevices. This paper introduces the continuous development of patterning technologies, provides a comprehensive review of the optical lithography and laser interference lithography techniques for the controllable fabrication of ZnO nanostructures, and elaborates on the potential applications of such patterned ZnO nanostructures in solar energy, water splitting, light emission devices, and nanogenerators. Patterned ZnO nanostructures with highly controllable morphology and structure possess discrete three-dimensional space structure, enlarged surface area, and improved light capture ability, which realize the efficient carrier regulation, achieve highly efficient energy conversion, and meet the diverse requirements of functional nanodevices. The patterning techniques proposed for the precise design of ZnO nanostructures not only have important guiding significance for the controllable fabrication of complex nanostructures of other materials, but also open up a new route for the further development of functional nanostructures.

show abstract

Enhanced light harvesting and electron collection in quantum dot sensitized solar cells by TiO2 passivation on ZnO nanorod arrays

Cited by 27 publications

References 43 publications

Thermally-assisted photodegradation of lignin by TiO2/H2O2 under visible/near-infrared light irradiation

Thermally-assisted photodegradation of lignin by TiO2/H2O2 under visible/near-infrared light irradiation

TiO2 Passivation Layer on ZnO Hollow Microspheres for Quantum Dots Sensitized Solar Cells with Improved Light Harvesting and Electron Collection

Design and tailoring of patterned ZnO nanostructures for energy conversion applications

Contact Info

Product

Resources

About