Long afterglow SrAl2O4:Eu,Dy phosphors for CdS quantum dot-sensitized solar cells with enhanced photovoltaic performance

Sun, Hengchao; Pan, Likun; Piao, Xianqing; Sun, Zhenrong

doi:10.1039/c3ta10596b

Cited by 53 publications

(35 citation statements)

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“…38,39 Accordingly, the resistance of the electrode is about 3.4 (T0), 1.5 (T1) and 4.7 (T3) ohm, respectively, which proves that the Sr-doped TiO 2 /SrTiO 3 heterostructures can effectively improve the charge transfer performance.More importantly, the diameter of the second arcs is in the order of D 1 >D 0 >D 3 , demonstrating that Sr-doped TiO 2 /SrTiO 3 heterostructure can effectively prolong the charge carriers' lifetime, but excess SrTiO 3 may result in the counter effect.The Sr-doping into lattice of TiO 2 could create impurity energy level and narrow the band gap for a wide light absorption. The chemical composition components and microstructures of Sr-doped TiO 2 /SrTiO 3 nanorod array heterostructures are investigated using XRD, XPS, SEM and TEM characterization techniques, respectively.…”

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confidence: 84%

“…38,39 Accordingly, the resistance of the electrode is about 3.4 (T0), 1.5 (T1) and 4.7 (T3) ohm, respectively, which proves that the Sr-doped TiO 2 /SrTiO 3 heterostructures can effectively improve the charge transfer performance. The chemical composition components and microstructures of Sr-doped TiO 2 /SrTiO 3 nanorod array heterostructures are investigated using XRD, XPS, SEM and TEM characterization techniques, respectively.…”

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confidence: 84%

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Enhanced photovoltaic performance of dye-sensitized solar cells based on Sr-doped TiO₂/SrTiO₃ nanorod array heterostructures

Tang

Yin

2015

J. Mater. Chem. A

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We present a novel Sr-doped TiO 2 /SrTiO 3 nanorod array heterostructures for dye sensitized solar cells (DSSCs) via a facile two-step hydrothermal process, with a tunable microstructure, optical response and photoelectrical conversion properties. The chemical composition components and microstructures of Sr-doped TiO 2 /SrTiO 3 nanorod array heterostructures are investigated using XRD, XPS, SEM and TEM characterization techniques, respectively. It is shown that the treatment of rutile TiO 2 nanorod arrays in Sr(NO 3 ) 2 solution results in the self-doping of Sr into lattice of TiO 2 and formation of Sr-doped TiO 2 /SrTiO 3 nanorod array heterostructures, inducing a transition of optical response property from ultraviolet region to visible region. The photogenerated electrons and holes can be effectively separated due to the formation of SrTiO 3 /Sr-doped TiO 2 heterostructure with uniquely matched band-gap energy structure, resulting in greatly enhanced photoelectric conversion efficiency performance. Electrochemical impedance spectroscopy and photoluminescence results show the formation of Sr-doped TiO 2 /SrTiO 3 heterostructure can effectively prolong the charge carriers' lifetime. The dye loading capacity on the Sr-doped TiO 2 /SrTiO 3 heterostructures can be improved through the functionalization bonding of the hydroxide group on surface of the electrode material. DSSCs based on optimized Sr-doped TiO 2 /SrTiO 3 heterostructure photoanode achieves the highest energy conversion efficiency of 4.70% (one sun illumination), nearly 1.5 times higher than the bare rutile TiO 2 photoanode (3.10%). 9 samples show two arcs in high frequency and low frequency region. It is reported that the first arc implies the charge-transfer resistance of the electrode, and the diameter of the second arc implies the electron life time. 38,39 Accordingly, the resistance of the electrode is about 3.4 (T0), 1.5 (T1) and 4.7 (T3) ohm, respectively, which proves that the Sr-doped TiO 2 /SrTiO 3 heterostructures can effectively improve the charge transfer performance.More importantly, the diameter of the second arcs is in the order of D 1 >D 0 >D 3 , demonstrating that Sr-doped TiO 2 /SrTiO 3 heterostructure can effectively prolong the charge carriers' lifetime, but excess SrTiO 3 may result in the counter effect.The Sr-doping into lattice of TiO 2 could create impurity energy level and narrow the band gap for a wide light absorption. The energy band diagram of DSSCs based on Sr-doped TiO 2 /SrTiO 3 heterostructure is shown in Fig. 9.Due to the matched band gap energy structure between TiO 2 and SrTiO 3 , the formation of Sr-doped TiO 2 /SrTiO 3 heterostructure can effectively suppress the recombination rate of light-induced electrons-holes. The conduction band (CB) of SrTiO 3 locates higher position than that of the rutile TiO 2 , while the valence band (VB) of SrTiO 3 lays lower position than that of rutile TiO 2 . 38, 41 Therefore, the photoinduced electrons from the lowest unoccupied molecular orbital (LUMO) of the dye molecule will t...

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mentioning

confidence: 84%

“…38,39 Accordingly, the resistance of the electrode is about 3.4 (T0), 1.5 (T1) and 4.7 (T3) ohm, respectively, which proves that the Sr-doped TiO 2 /SrTiO 3 heterostructures can effectively improve the charge transfer performance. The chemical composition components and microstructures of Sr-doped TiO 2 /SrTiO 3 nanorod array heterostructures are investigated using XRD, XPS, SEM and TEM characterization techniques, respectively.…”

mentioning

confidence: 84%

Enhanced photovoltaic performance of dye-sensitized solar cells based on Sr-doped TiO₂/SrTiO₃ nanorod array heterostructures

Tang

Yin

2015

J. Mater. Chem. A

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“…When the excitation light source is turned off, some holes captured by the Dy 3+ could be thermally released slowly to valence bands. The released holes travel back to Eu 2+ and return to the ground state of Eu 2+ accompanying with light emission . Generally, the SrAl 2 O 4 :Eu 2+ ,Dy 3+ phosphor is one of the best afterglow materials.…”

Section: Resultsmentioning

confidence: 99%

Long Afterglow SrAl₂O₄:Eu²⁺,Dy³⁺ Phosphors as Luminescent Down‐Shifting Layer for Crystalline Silicon Solar Cells

Wang

Xuan

Liu

et al. 2014

Int J Applied Ceramic Tech

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SrAl 2 O 4 :Eu 2+ ,Dy 3+ phosphors can convert near ultraviolet light with lower sensitivity to the solar cell to yellow-green light at which the solar cell has higher sensitivity and exhibit the excellent luminescent property of long persistence. Therefore, in this study, the authors firstly synthesized the fine SrAl 2 O 4 :Eu 2+ ,Dy 3+ phosphors and then produced SrAl 2 O 4 :Eu 2+ ,Dy 3+ /SiO 2 composite films as spectral shifters to understand the effects of SrAl 2 O 4 :Eu 2+ ,Dy 3+ phosphor on photoelectric conversion efficiencies of a crystalline silicon photovoltaic module. Under one sun illumination, the composite film containing an appropriate amount of SrAl 2 O 4 :Eu 2+ ,Dy 3+ phosphor enhances the photoelectric conversion efficiency of the cell through spectral down-shifting as compared to the bare glass substrate, and the maximum achieves 11.12%. In contrast, the commercial SrAl 2 O 4 :Eu 2+ ,Dy 3+ phosphor composite film is not effective for improving the photoelectric conversion efficiency because of the relatively lower visible light transmittance of film caused by the large aggregates. After one sun illumination for 1 min, the light source was turned off, and the cell containing the synthesized SrAl 2 O 4 :Eu 2+ ,Dy 3+ phosphor still shows an efficiency of 1.16% in the dark due to the irradiation by the long persistent light from SrAl 2 O 4 :Eu 2+ ,Dy 3+ , which provides a possibility to fulfill the operation of solar cells even in the dark.

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“…Rare-earth-doped aluminate micro- and nanoparticles (SrAl 2 O 4 : Eu 2+ , Dy 3+ , denoted as SAOED) are environment-friendly functional inorganic materials. These SAOED particles show a high luminous efficiency and a long afterglow time, and thus are widely used in luminous displays [17], warning signs [18], and advertisement cards [19]. However, these particles are prone to hydrolysis in high-moisture environments and because of the damage of their crystal structures it leads to non-luminescence [20].…”

Section: Introductionmentioning

confidence: 99%

Fabrication Flexible and Luminescent Nanofibrillated Cellulose Films with Modified SrAl2O4: Eu, Dy Phosphors via Nanoscale Silica and Aminosilane

et al. 2018

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Flexible 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-oxidized nanofibrillated cellulose (ONFC) films with long afterglow luminescence containing modified SrAl2O4: Eu2+, Dy3+ (SAOED) phosphors were fabricated by a template method. Tetraethyl orthosilicate (TEOS) and (3-aminopropyl) trimethoxy-silane (APTMS) were employed cooperatively to improve the water resistance and compatibility of the SAOED particles in the ONFC suspension. The structure and morphology after modification evidenced the formation of a superior SiO2 layer and coarse amino-compounds on the surface of the phosphors. Homogeneous dispersions containing ONFC and the modified phosphors were prepared and the interface of composite films containing the amino-modified particles showed a more closely packed structure and had less voids at the interface between the cellulose and luminescent particles than that of silica-modified phosphors. The emission spectra for luminescent films showed a slight blue shift (3.2 nm) at around 512 nm. Such flexible films with good luminescence, thermal resistance, and mechanical properties can find applications in fields like luminous flexible equipment, night indication, and portable logo or labels.

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Long afterglow SrAl2O4:Eu,Dy phosphors for CdS quantum dot-sensitized solar cells with enhanced photovoltaic performance

Cited by 53 publications

References 53 publications

Enhanced photovoltaic performance of dye-sensitized solar cells based on Sr-doped TiO₂/SrTiO₃ nanorod array heterostructures

Enhanced photovoltaic performance of dye-sensitized solar cells based on Sr-doped TiO₂/SrTiO₃ nanorod array heterostructures

Long Afterglow SrAl₂O₄:Eu²⁺,Dy³⁺ Phosphors as Luminescent Down‐Shifting Layer for Crystalline Silicon Solar Cells

Fabrication Flexible and Luminescent Nanofibrillated Cellulose Films with Modified SrAl2O4: Eu, Dy Phosphors via Nanoscale Silica and Aminosilane

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Long afterglow SrAl2O4:Eu,Dy phosphors for CdS quantum dot-sensitized solar cells with enhanced photovoltaic performance

Cited by 53 publications

References 53 publications

Enhanced photovoltaic performance of dye-sensitized solar cells based on Sr-doped TiO2/SrTiO3 nanorod array heterostructures

Enhanced photovoltaic performance of dye-sensitized solar cells based on Sr-doped TiO2/SrTiO3 nanorod array heterostructures

Long Afterglow SrAl2O4:Eu2+,Dy3+ Phosphors as Luminescent Down‐Shifting Layer for Crystalline Silicon Solar Cells

Fabrication Flexible and Luminescent Nanofibrillated Cellulose Films with Modified SrAl2O4: Eu, Dy Phosphors via Nanoscale Silica and Aminosilane

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Enhanced photovoltaic performance of dye-sensitized solar cells based on Sr-doped TiO₂/SrTiO₃ nanorod array heterostructures

Enhanced photovoltaic performance of dye-sensitized solar cells based on Sr-doped TiO₂/SrTiO₃ nanorod array heterostructures

Long Afterglow SrAl₂O₄:Eu²⁺,Dy³⁺ Phosphors as Luminescent Down‐Shifting Layer for Crystalline Silicon Solar Cells