Depth resolved defect characterization of energetic ion irradiated ZnO by positron annihilation techniques and photoluminescence

Sarkar, A.; Chakrabarti, Mahuya; Sanyal, Dirtha; Gogurla, Narendar; Kumar, Pravin; Brusa, R. S.; Hugenschmidt, Christoph

doi:10.1088/1361-648x/ab3f74

Cited by 4 publications

(2 citation statements)

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“…The Doppler broadening spectra have been analyzed by the so-called line-shape parameter (S-parameter). The S-parameter is the ratio of the positrons annihilated with the lower momentum electrons (|511 keV-E| 0.85 keV) with the annihilation of positrons with higher momentum electrons (|511 keV-E| 4.25 keV) under the 511 keV photopeak [36].…”

Section: Materials Characterizationmentioning

confidence: 99%

“…To study the point defects in the MAPbI 3 positron annihilation spectroscopy (PAS) has been successfully employed [14,[32][33][34]. Positron annihilation spectroscopy is a non-destructive nuclear solid-state technique to study the defects in different materials [35][36][37]. In comparison to MAPbI 3 , MAPbBr 3 has demonstrated higher thermal and environmental stability for optoelectronic applications [38,39].…”

Section: Introductionmentioning

confidence: 99%

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Positron annihilation studies of methylammonium lead bromide perovskite

Moshat¹,

Ray²,

Sil³

et al. 2023

Phys. Scr.

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Methylammonium lead halide-based perovskite has shown excellent optoelectronic properties. But their performances and stability are critically affected by the ionic defects present in the crystal lattice. In this article, we have investigated the presence of ionic vacancy mediated defects formation in ball mill ground methylammonium lead bromide (MAPbBr3) which has applications in tandem solar cell, light emitting diodes and laser devices. The evaluation of those point defects with temperature was analysed by employing the positron annihilation spectroscopic (PAS) studies. The phase transition from tetragonal to cubic phases around 260 K was exactly correlated with the temperature-dependent ‘S parameter’ determination from PAS analysis and with dc conductivity measurement. From coincidence Doppler broadening (CDB) spectroscopy significant proportion of defects arising from lead vacancy was observed whose magnitude reduces from the low-temperature tetragonal phase to higher temperature cubic phases.

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Section: Materials Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Positron annihilation studies of methylammonium lead bromide perovskite

Moshat¹,

Ray²,

Sil³

et al. 2023

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

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Laterally Modulating Carrier Concentration by Ion Irradiation in CdO Thin Films for Mid‐IR Plasmonics

Cleri,

He,

Tolchin

et al. 2024

Advanced Optical Materials

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This report demonstrates tunable carrier densities in CdO thin films through local ion irradiation, providing lateral control of mid‐IR optical properties. Ion‐solid interactions produce donor‐like defects that boost electron concentrations from the practical minimum of 2.5 × 1019 cm−3 to a maximum of 2.5 × 1020 cm−3 by metered ion exposure. This range is achieved using He, N, Ar, or Au ions at 1–2.8 MeV; when normalized by displacements per atom, all ion species produce comparable results. Since CdO is well‐described by the Drude model, irradiation‐tuned carrier densities directly alter the infrared dielectric function, and in turn, mid‐infrared optical properties. Further, it is demonstrated that by combining irradiation with traditional lithography, CdO films expose to ions in the presence of 3‐µm thick, patterned photoresist exhibit lateral carrier density profiles with ≈400‐nm resolution. Scanning near‐field optical microscopy reveals sharp optical interfaces with almost no companion contrast in surface morphology, microstructure, or crystallinity. Finally, CdO lateral homostructures supporting surface plasmon polaritons (SPPs) are demonstrated whose dispersion relation can be tuned through periodic patterning in a monolithic platform by simple nanofabrication. Numerical simulations show these polaritons result from strong coupling between excitations at CdO plasma frequencies and SPPs supported by the platinum substrate.

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