High performance of Mn-doped CdSe quantum dot sensitized solar cells based on the vertical ZnO nanorod arrays

Hou, Juan; Zhao, Haifeng; Huang, Fei; Jing, Qun; Cao, Haibin; Wu, Qiang; Peng, Shanglong; Cao, Guozhong

doi:10.1016/j.jpowsour.2016.06.070

Cited by 81 publications

(32 citation statements)

References 58 publications

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“…As Cd ions exist at a lower level than Zn ions, forming CdS with relatively narrow band gap, therefore electrons would need less energy to be excited to the Cd ion level. Both the excitation wavelength and absorption wavelength of QDs appeared red‐shifted due to quantum size confinement effects, previously reported by several groups …”

Section: Resultscontrasting

confidence: 81%

Tunable excitation properties of ZnCdS:Mn/ZnS quantum dots for cancer imaging

2018

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Water-soluble ZnS:Mn quantum dots (QDs) were synthesized using a hydrothermal method with 3-mercaptopropionic acid as stabilizer. The optical properties of ZnS:Mn QDs were thoroughly investigated by tuning the doping concentration of Mn and the Zn/S precursor ratio, to obtain an optimal parameter for QDs with excellent fluorescence characteristics. ZnS:Mn QDs excited at only one wavelength, however, which seriously limited their further application. Here, a trace Cd ion was doped into a ZnS host, resulting in QD excitation covering a wide adjustable waveband. Furthermore, when a ZnS shell was coated onto the surface of the ZnCdS:Mn QDs, photoluminescence intensity and stability were further enhanced. After coupling with an anti-CK 19 antibody, the ZnCdS:Mn/ZnS core/shell QDs were able to function by labeling cancer cells, indicating that they could be considered as a suitable bio-probe for cells and tissue imaging.

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Section: Resultscontrasting

confidence: 81%

Tunable excitation properties of ZnCdS:Mn/ZnS quantum dots for cancer imaging

2018

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“…The peak of 651.2 eV is only found in oxide coating formed at the temperature of 800°C. Accordingly, all the peaks listed earlier are corresponding with Mn 2+ , which exists in the stage of MnCr 2 O 4. The binding energy of MnCr 2 O 4 in the tetragonal site and the octahedral site are assigned at 639.7 and 640.9 eV, respectively .…”

Section: Resultsmentioning

confidence: 90%

A novel spinel coating on cobalt‐based Superalloy GH605 via an in‐situ oxidation approach

Zhang

Liu

2018

Surface & Interface Analysis

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Cr‐Mn‐O spinel coating was prepared on the surface of cobalt‐based superalloy GH605 via an in‐situ oxidation method in H2O‐H2 environment. The composition, morphology, and chemical value state of the oxide spinel coatings were investigated by SEM, EDS, XRD, Raman spectra, and XPS. It indicated that the morphology of coating varied with oxidation temperature, and granular surface appeared when oxidation temperature increased to 1100°C. The formed Cr‐Mn‐O spinel coating was composed of Cr2O3 and MnCr2O4, and the thickness increased significantly with oxidation temperature. In the coating, Cr element existed in the state of Cr3+ ions and Cr6+ ions, while Mn element only existed in the form of Mn2+ ions.

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“…The first semicircle is assigned to the redox reaction at the counter electrode/electrolyte interface at high frequencies (Rc). The second semicircle obtained at an intermediate frequency is associated with the charge transfer across the photoanode/QDs sensitizers/electrolyte interface, and the size of the semicircle represents the charge transport/recombination resistance (Rct) [14,41]. In our study, analysis of the EIS data was carried out by the "Zview" software and summarized in Table 2.…”

Section: Samplesmentioning

confidence: 99%

“…1D or quasi-1D nanostructure films, such as nanowire-, nanotube-or nanorod array-based photoanodes, can offer direct electron transport pathways and facilitate carrier transport to reduce the probability of charge recombination [12,13]. Although 1D ZnO nanostructure-based QDSCs have been widely investigated during past years, the PCE of devices co-sensitized with CdS/CdSe is still lower than in those based on TiO2 nanocrystals [14,15]. Many previous papers have demonstrated that there are multiple surface defects in ZnO arising from oxygen vacancies and dangling bonds (hydroxyl groups), which promote surface charge recombination and result in the decrease of current density (Jsc) [5,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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

Zhao

Hou

et al. 2017

Sci. China Mater.

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Light capture and electron recombination are the essential processes that determine power conversion efficiency (PCE) in quantum dot sensitized solar cells (QDSCs). It is well known that charges are easily transported in well-built QDSCs based on nanorod arrays. However, this advantage can be drastically weakened by defects located at the zinc oxide (ZnO) array surface which permit faster electron recombination. Hence, we developed a composite nanostructure consisting of ZnO nanorods coated with orthorhombic configuration titanium dioxide (TiO2) nanoparticles, which were synthesized using a solution of H3BO3 and (NH4)2TiF6. This composite nanostructure was designed to take the advantage of the enlarged surface area provided by the nanoparticles and improved electron transport along the nanorods, in order to yield good charge transport and light harvesting. At the same time, the TiO2/ZnO nanorod arrays have fewer recombination centers (hydroxyl groups) after TiO2 modification, which results in fewer electron trapping events at the ZnO nanorod surface; thereby, a reduced charge recombination and longer electron lifetime can be achieved. As a result, the PCE of the QDSCs with TiO2-nanoparticles-decorated ZnO nanorod arrays photoelectrode reaches 4.8%, which is~78% higher efficiency compared to 2.7% for solar cells without modification.

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High performance of Mn-doped CdSe quantum dot sensitized solar cells based on the vertical ZnO nanorod arrays

Cited by 81 publications

References 58 publications

Tunable excitation properties of ZnCdS:Mn/ZnS quantum dots for cancer imaging

Tunable excitation properties of ZnCdS:Mn/ZnS quantum dots for cancer imaging

A novel spinel coating on cobalt‐based Superalloy GH605 via an in‐situ oxidation approach

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

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