Structural and optical properties of polar and non-polar ZnO films grown by MOVPE

Zhu, Jin; Aaltonen, Titta; Galeckas, Augustinas; Kuznetsov, A. Yu.

doi:10.1016/j.jcrysgro.2008.07.117

Cited by 18 publications

(7 citation statements)

References 25 publications

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“…5. It can be seen a UV emission around 3.27 eV of both layers grown on polar and non-polar substrates [37,38]. This peak is the transition of free exciton, which has been confirmed by the temperature dependent Pl measurements [39].…”

Section: Methodssupporting

confidence: 63%

A comparative structure and morphology study of Zn(1−x)CdxO solid solution grown on ZnO and different sapphire orientations

Fouzri

Sallet

Oumezzine

2011

Journal of Crystal Growth

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Section: Methodssupporting

confidence: 63%

A comparative structure and morphology study of Zn(1−x)CdxO solid solution grown on ZnO and different sapphire orientations

Fouzri

Sallet

Oumezzine

2011

Journal of Crystal Growth

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“…19 Note that XRD features of zb-ZnO appears to be close to those of rs-CdO, with characteristic (002) and (111) peaks at 2θ = 39.50 • and 34.00 • , respectively. [15][16][17][18][19][20][21] PL properties of the samples were investigated at 10 K and 300 K employing a 325-nm-wavelength cw He-Cd laser with an output power of 10 mW as an excitation source. The emission was collected with a microscope and directed to an imaging spectrometer (HORIBA Jobin Yvon, iHR320) equipped with an electron multiplying charge-coupled device (EMCCD) camera (Andor DL-658M) and also to fiber-optic spectrometers (Ocean Optics, HR4000 and USB4000) with 0.2-and 2-nm spectral resolutions, respectively.…”

Section: Methodsmentioning

confidence: 99%

Understanding phase separation in ZnCdO by a combination of structural and optical analysis

et al. 2011

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A phenomenon of wurtzite (w), zincblende (zb), and rock-salt (rs) phase separation was investigated in ZnCdO films having Cd contents in the range of 0%-60% settling a discussion on the phase stability issues in ZnCdO. First, low-Cd-content (17%) ZnCdO was realized preferentially in a w matrix determining optimal Zn-lean conditions by tuning the precursor decomposition rates during synthesis. However, more detailed analysis of x-ray diffraction and photoluminescence (PL) data revealed that the w single-phase stability range is likely to be as narrow as 0%-2% Cd, while samples containing 7%-17% of Cd exhibit a mixture of w and zb phases. Second, high-Cd-content (32%-60%) ZnCdO samples were realized, supplying more of the Cd precursor utilizing Zn-lean growth conditions, however, resulting in a mixture of w, zb, and rs phases. Characteristic PL signatures at 2.54 and 2.31 eV were attributed to zb-ZnCdO and rs-CdO, respectively, while the band gap variation in w-Zn 1−x Cd x O is given by (3.36-0.063x) as determined at 10 K. The phase separation is interpreted in terms of corresponding changes in the charge distribution and reduced stacking fault energy.

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“…More detailed descriptions of the reactor, precursor delivery, substrate pretreatments, etc., can be found elsewhere. 14 In short, DMCd, DEZn, and t-BuOH were employed as Cd, Zn, and O sources carried by highpurity N 2 gas. Two sets of samples were prepared.…”

Section: Methodsmentioning

confidence: 99%

Surface/strain energy balance controlling preferred orientation in CdZnO films

Zhang¹,

Kuznetsov²

2011

Journal of Applied Physics

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Single-phase rock-salt CdZnO films were synthesized on r-plane sapphire substrates by metal-organic chemical vapor deposition. Evolutions in growth orientations were investigated in these films as a function of Zn content and film thickness. The preferred orientation is found to black (thick) and red (thin) lines depend on the balance between the surface and strain energy accumulated in the films in accordance with the so-called overall energy model. Specifically, (100) orientation dominates below a critical Zn content and/or a critical film thickness, otherwise (111)-oriented grains nucleate on top of the (100) planes. V

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Structural and optical properties of polar and non-polar ZnO films grown by MOVPE

Cited by 18 publications

References 25 publications

A comparative structure and morphology study of Zn(1−x)CdxO solid solution grown on ZnO and different sapphire orientations

A comparative structure and morphology study of Zn(1−x)CdxO solid solution grown on ZnO and different sapphire orientations

Understanding phase separation in ZnCdO by a combination of structural and optical analysis

Surface/strain energy balance controlling preferred orientation in CdZnO films

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