Bismuth oxyhalide based photo-enhanced triboelectric nanogenerators

Yu, Zidong; Yang, Han; Soin, Navneet; Chen, Liming; Black, Nathan; Xu, Ke; Sharma, Preetam K.; Tsonos, Christos; Kumar, Amit; Luo, Jikui

doi:10.1016/j.nanoen.2021.106419

Cited by 27 publications

(28 citation statements)

References 70 publications

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“…S1, ESI †) induces an upshift of the surface potential, which is indicative that wrt to the negative tip, the electronic charge exits the grounded Au/ITO substrate. 17,32 This is aided by the difference in the Fermi levels between the Au and ITO, which leads to the formation of a relatively small barrier height (j SB B 0.7 eV). This allows the injection of hot electrons into the ITO substrate and thus leaves the Au positively charged owing to electronic depletion.…”

Section: Resultsmentioning

confidence: 99%

“…For such KPFM measurements, a Pt-coated Si tip (Nanosensor PPP-EFM) with a stiffness constant k of 2.8 N m À1 was used. Similar to our earlier work, 17 the photoexcitation KPFM measurements were carried out using bottom illumination via a white light LED with a l cut-off of 400 nm and a broadband response centred at B550 nm, which was focused using a 20Â objective lens with an overall spot size of B300 mm.…”

Section: Photo-kpfm Measurementsmentioning

confidence: 99%

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Total electrification of large-scale nanophotonic arrays by frictional charges

Bhalla

Pauly

et al. 2022

Nanoscale Horiz.

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Section: Resultsmentioning

confidence: 99%

Section: Photo-kpfm Measurementsmentioning

confidence: 99%

Total electrification of large-scale nanophotonic arrays by frictional charges

Bhalla

Pauly

et al. 2022

Nanoscale Horiz.

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“…46 Figure 3(a) shows the generation of a positive SPV on an n-type semiconductor surface, where photogenerated electrons and holes drift toward the bulk and the surface, respectively. 47 Thus, the charge separation process leads to changes in the surface potential of both surfaces with positive charges. 48 Figure 3(b) shows that compared to the dark condition, the relative local surface potential of the sample increased from 0 to 252 mV under 365 nm illumination.…”

Section: Methodsmentioning

confidence: 99%

Locking Energy Transfer of Rare Earth Ions via an “Electron Jam” Caused by Vertical Photocarrier Separation of a Layered Semiconductor

Fan

et al. 2022

J. Phys. Chem. C

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Energy transfer (ET) of trivalent rare earth (RE)-doped inorganic crystals has been investigated comprehensively from theory to technology; however, the influence of photocarrier transmission has been considered impossible, as the 4f electrons of RE ions are shielded well from outer electrons. Here, on the basis of an anisotropic Bi3O4Cl layered semiconductor, we report for the first time the ET phenomenon of an Er3+–Yb3+ codoped system locked by photocarrier separation. When the photocarrier of the layered host is separated efficiently under a vertical spontaneous interelectric field, the ET and energy-back-transfer (EBT) between Er3+ and Yb3+ ions can be inhibited completely; otherwise, they can occur as usual. Consequently, the Yb3+ ion dopant mainly acts as a quencher for 980 nm-excited visible upconversion (UC) and infrared emission of Er3+ ions, and the cross-relaxation between Er3+ and Yb3+ ions via EBT is inhibited simultaneously. We show that the separated photoholes on the surface can suppress the recombination of excited electrons of Er3+ ions to the ground level, leading to a special “electron jam” on intermediate levels, which prevents the acceptance of excited electrons further via either the ET or EBT process. The result of our current work greatly enhances the understanding of ET behavior of RE ions and the material structure of RE-doped materials.

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“…The output performance of TENG is heavily dependent on the surface charge density of the friction material. [23][24][25] Hence, it becomes important to control the interface charge density by changing the properties of friction materials. [16,26,27] The most robust consensus related to ionic-hydrogel-based triboelectric nanogenerator (TENG) is that the charge density at the solid interface plays a pivotal role in its output performance.…”

Section: Introductionmentioning

confidence: 99%

“…The output performance of TENG is heavily dependent on the surface charge density of the friction material. [ 23–25 ] Hence, it becomes important to control the interface charge density by changing the properties of friction materials. [ 16,26,27 ]…”

Section: Introductionmentioning

confidence: 99%

Ionic Thermoelectric Effect Inducing Cation‐Enriched Surface of Hydrogel to Enhance Output Performance of Triboelectric Nanogenerator

et al. 2022

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The most robust consensus related to ionic‐hydrogel‐based triboelectric nanogenerator (TENG) is that the charge density at the solid interface plays a pivotal role in its output performance. However, there has been no reliable evidence of the mechanism regarding the influence of ion enrichment on TENG. Higher surface charge density at the solid interface could result in higher output performance. Herein, the ionic hydrogel is prepared through polymerization reaction of the organic monomers with LiCl as the ionic conductor. The ion migration on the hydrogel surface is regulated via tuning the temperature difference between the top and bottom sides. Upon contacting with the upper electrode, more induction charges are induced on the cation‐enriched surface of hydrogel, leading to a larger output of the TENG. At the temperature difference of 25 °C, the open‐circuit voltage and maximum output power density is increased by 77% and 166% compared with the TENG without temperature field, respectively. When the temperature of the hydrogel surface is higher than 50 °C, the output performance of TENG would decrease due to the water loss of hydrogel. This research will advance further understanding of the mechanism of thermoelectric ionic conductors in TENGs, self‐powered sensors, and wearable devices.

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Bismuth oxyhalide based photo-enhanced triboelectric nanogenerators

Cited by 27 publications

References 70 publications

Total electrification of large-scale nanophotonic arrays by frictional charges

Total electrification of large-scale nanophotonic arrays by frictional charges

Locking Energy Transfer of Rare Earth Ions via an “Electron Jam” Caused by Vertical Photocarrier Separation of a Layered Semiconductor

Ionic Thermoelectric Effect Inducing Cation‐Enriched Surface of Hydrogel to Enhance Output Performance of Triboelectric Nanogenerator

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