Probing defects and their implications in pH-controlled ZnO QDs: a theory-aided experimental investigation

Mishra, Prashant Kumar; Kumar, Mukul; Kaur, Jagjit; Gaurav, Ashish; Sinha, Deepali; Chakraborty, Sudip; Sen, Somaditya

doi:10.1007/s10854-021-07079-8

Cited by 2 publications

(2 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Having evidenced the ability of the CV method in probing the trap states in ZnO QDs, the origins of the defects were further analyzed. According to the literature, there are likely six types of point defects in ZnO QDs, including zinc interstitials (Zn i ), oxygen vacancies (V O ), oxygen interstitials (O i ), Zn vacancies (V Zn ), Zn O (Zn in O‐site) and O Zn (O in Zn‐site) [27] . The positions of some point defects are 2.75–3.00 eV (Zn i →VBE), 2.50–2.75 eV (CBE→V Zn ), 1.65–2.17 eV (CBE→O i ) and 2.17–2.50 eV (CBE→V O ).…”

Section: Resultsmentioning

confidence: 99%

“…According to the literature, there are likely six types of point defects in ZnO QDs, including zinc interstitials (Zn i ), oxygen vacancies (V O ), oxygen interstitials (O i ), Zn vacancies (V Zn ), Zn O (Zn in O-site) and O Zn (O in Zn-site). [27] The positions of some point defects are 2.75-3.00 eV (Zn i !VBE), 2.50-2.75 eV (CBE!V Zn ), 1.65-2.17 eV (CBE!O i ) and 2.17-2.50 eV (CBE!V O ). As displayed in Table S3, the intra-bandgaps (CBE-defect gaps) determined by CV for ZnO, ZnO-EA and ZnO-TEA QDs are 1.70, 2.34 and 2.44 eV, respectively.…”

Section: Chemistry-a European Journalmentioning

confidence: 99%

See 1 more Smart Citation

Electrochemically Determining Electronic Structure of ZnO Quantum Dots with Different Surface Ligands

Xian

Zhang

Luo

et al. 2022

Chemistry A European J

View full text Add to dashboard Cite

The electronic structure of quantum dots (QDs) including band edges and possible trap states is an important physical property for optoelectronic applications. The reliable determination of the energy levels of QDs remains a big challenge. Herein we employ cyclic voltammetry (CV) to determine the energy levels of three types of ZnO QDs with different surface ligands. Coupled with spectroscopic techniques, it is found that the onset potential of the first reductive wave is likely related to the conduction band edges while the first oxidative wave originates from the trap states. The determined specific energy levels in CV further demonstrates that the ZnO QDs without surface ligands mainly have oxygen interstitial defects whilst the ZnO QDs covered with ligands contain oxygen vacancies. The present electrochemical method offers a powerful and effective way to determine the energy levels of wide bandgap ZnO QDs, which will boost their device performance.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Chemistry-a European Journalmentioning

confidence: 99%

Electrochemically Determining Electronic Structure of ZnO Quantum Dots with Different Surface Ligands

Xian

Zhang

Luo

et al. 2022

Chemistry A European J

View full text Add to dashboard Cite

show abstract

Research advances in ZnO nanomaterials-based UV photode tectors: a review

Chen

et al. 2023

Nanotechnology

View full text Add to dashboard Cite

Ultraviolet photodetectors (UV PDs) have always been the research focus of semiconductor optoelectronic devices due to their wide application fields and diverse compositions. As one of the best-known n-type metal oxides in third-generation semiconductor electronic devices, ZnO nanostructures and their assembly with other materials have received extensive research. In this paper, the research progress of different types of ZnO UV PDs is reviewed, and the effects of different nanostructures on ZnO UV PDs are summarized in detail. In addition, physical effects such as piezoelectric photoelectric effect, pyroelectric effect, and three ways of heterojunction, noble metal local surface plasmon resonance enhancement and formation of ternary metal oxides on the performance of ZnO UV PDs were also investigated. The applications of these PDs in UV sensing, wearable devices, and optical communication are displayed. Finally, the possible opportunities and challenges for the future development of ZnO UV PDs are prospected.

show abstract

Probing defects and their implications in pH-controlled ZnO QDs: a theory-aided experimental investigation

Cited by 2 publications

References 50 publications

Electrochemically Determining Electronic Structure of ZnO Quantum Dots with Different Surface Ligands

Electrochemically Determining Electronic Structure of ZnO Quantum Dots with Different Surface Ligands

Research advances in ZnO nanomaterials-based UV photode tectors: a review

Contact Info

Product

Resources

About