Nano carbon conformal coating strategy for enhanced photoelectrochemical responses and long-term stability of ZnO quantum dots

Kim, Jung Kyu; Bae, Sukang; Kim, Wanjung; Jeong, Myung Jin; Lee, Sang Hyun; Lee, Chang Lyoul; Choi, Won Kook; Hwang, Jun Yeon; Park, Jae Hyung; Son, Dong Ick

doi:10.1016/j.nanoen.2015.02.013

Cited by 57 publications

(34 citation statements)

References 42 publications

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“…Figure 6a shows the steady-state PL spectra. The TRPL curves were analyzed with FluoFit software [43,44] and were fitted with tri-exponentiald ecay.T he corresponding parameters are summarized in Ta ble 1. [26] According to the steady-stateP Ls pectra (Figure 6a), the PL intensity is significantly quenched, which indicates that Cr 2 O 3 ESLs have superior electron extraction and transporting properties.…”

Section: Photoelectrical Propertiesmentioning

confidence: 99%

“…Figure 6b shows the TRPL spectra of perovskite light-absorption layer on Cr 2 O 3 ESLs and blank FTO substrate. The TRPL curves were analyzed with FluoFit software [43,44] and were fitted with tri-exponentiald ecay.T he corresponding parameters are summarized in Ta ble 1. Usually,afast decay process is related to an efficient chargec arriere xtraction between the perovskite layer and the ESL.…”

Section: Photoelectrical Propertiesmentioning

confidence: 99%

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Annealing‐Free Cr₂O₃ Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells

Dong

Jia

et al. 2018

ChemSusChem

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The electron-selective layer (ESL) plays a pivotal role in the performance of perovskite solar cells (PSCs). In this study, amorphous dispersible chromium oxide (Cr O ) nanosheets are synthesized by a facile solvothermal reaction, and a Cr O ESL is prepared by spin-coating Cr O ink on fluorine-doped tin oxide substrates without need for further annealing. By using Cr O as the electron-selective layer and Cs (MA FA ) Pb(I Br ) as the light-absorption layer, a planar hybrid perovskite solar cell is fabricated. The spin-coating speed is optimized, the structure and morphology of samples are observed, the photoelectrical properties of ESLs are characterized, and the photovoltaic behaviors of devices are measured. Results show that the as-prepared Cr O layer has high optical transmittance and superb electron extraction and carrier transport property. The planar hybrid PSC based on the optimized Cr O ESL achieves a power conversion efficiency of 16.23 %, which is comparable to devices based on a conventional high-temperature-calcined TiO ESL. These results demonstrate a low-cost and facile route to highly effective perovskite solar cells.

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Section: Photoelectrical Propertiesmentioning

confidence: 99%

Section: Photoelectrical Propertiesmentioning

confidence: 99%

Annealing‐Free Cr₂O₃ Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells

Dong

Jia

et al. 2018

ChemSusChem

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“…The solar simulator (PEC-L01, PECCELL) was also utilized as the light source. The working electrode was prepared by the following manner [27]: 3 wt% of solution was prepared by dispersing the photocatalyst powders in 1 mL of ethanol solvent. After adding 0.5 mL of ethyl cellulose solution (10 wt% aq.…”

Section: Photoelectrochemical Measurementmentioning

confidence: 99%

“…In order to calculate their rate constants, natural logarithmic plots were prepared as shown in Figure 3b. By using the first order reaction rate equation (C/C0=exp(-kt)), the rate constants (k) are calculated [27]. TP-TiO2 shows approximately 3-folds higher k value than bare TiO2.…”

Section: Photocatalytic Performancementioning

confidence: 99%

Conformal Titanyl Phosphate Surface Passivation for Enhancing Photocatalytic Activity

Kim

2018

Applied Sciences

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A conformal titanyl phosphate passivation with the thickness of ca. 5 nm on the surface of TiO 2 nanoparticles for enhancing the photocatalytic degradation of organic pollutants and hydrogen production is described. The phosphate anion species bound to the surface of TiO 2 promote the favorable kinetics of photocatalytic activity and influence the catalytic reaction pathway. By using a facile surfactant-assisted sol-gel process, the surface defects of TiO 2 associated with deep traps was reduced and passivated by the phosphate anion species to form the titanyl phosphate. The strong bonds between the titanyl phosphate shell and TiO 2 core provided a long-term photochemical stability in aqueous electrolytes with enhanced photocatalytic activities. The titanyl phosphate contributed to the production and stabilization of hydroxyl radicals on the surface of photocatalyst, which facilitated the efficient photooxidation of the organic pollutants. Further, enhancing the photocatalytic hydrogen production was achieved by the titanyl phosphate modified TiO 2 (TP-TiO 2 ). Consequently, the conformal titanyl phosphate passivation enhanced photocatalytic activity of TiO 2 . Comparing to the bare TiO 2 nanoparticles, approximately two-fold higher photocatalytic H 2 production rate was achieved by the TP-TiO 2 .

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“…[1][2][3] Benefit from its outstanding semiconductor properties, ZnO was widely studied in various applications including photoelectrocatalysis, 4,5 photocatalysis, 6,7 light emission devices, 8 ion batteries, 9 and solar cells. 10 Many of the prospective applications for ZnO require both n-and p-type ZnO.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence study of p-type vs. n-type Ag-doped ZnO films

Myers

Khranovskyy

Jian

et al. 2015

Journal of Applied Physics

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Silver doped ZnO films have been grown on sapphire (0001) substrates by pulsed laser deposition.Hall measurements indicate that p-type conductivity is realized for the films deposited at 500 C and 750 C. Transmission electron microscopy images show more obvious and higher density of stacking faults (SFs) present in the p-type ZnO films as compared to the n-type films. Top view and cross sectional photoluminescence of the n-and p-type samples revealed free excitonic emission from both films. A peak at 3.314 eV, attributed to SF emission, has been observed only for the n-type sample, while a weak neutral acceptor peak observed at 3.359 eV in the p-type film. The SF emission in the n-type sample suggests localization of acceptor impurities nearby the SFs, while lack of SF emission for the p-type sample indicates the activation of the Ag acceptors in ZnO.

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Nano carbon conformal coating strategy for enhanced photoelectrochemical responses and long-term stability of ZnO quantum dots

Cited by 57 publications

References 42 publications

Annealing‐Free Cr₂O₃ Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells

Annealing‐Free Cr₂O₃ Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells

Conformal Titanyl Phosphate Surface Passivation for Enhancing Photocatalytic Activity

Photoluminescence study of p-type vs. n-type Ag-doped ZnO films

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Nano carbon conformal coating strategy for enhanced photoelectrochemical responses and long-term stability of ZnO quantum dots

Cited by 57 publications

References 42 publications

Annealing‐Free Cr2O3 Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells

Annealing‐Free Cr2O3 Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells

Conformal Titanyl Phosphate Surface Passivation for Enhancing Photocatalytic Activity

Photoluminescence study of p-type vs. n-type Ag-doped ZnO films

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Product

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Annealing‐Free Cr₂O₃ Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells

Annealing‐Free Cr₂O₃ Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells