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3 Acta Physica Polonica A

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Impact of Thin LT-GaN Cap Layers on the Structural and Compositional Quality of MOVPE Grown InGaN Quantum Wells Investigated by TEM

100%

Ivaldi F. , Kret S. , Szczepańska A. , Czernecki R. , Kryśko M. , Grzanka S. , Leszczyński M.

nr 5

660-662

Two samples containing InGaN quantum wells have been grown by metal-organic vapor phase epitaxy on high pressure grown monocrystalline GaN (0001). Different growth temperatures have been used to grow the wells and the barriers. In one of the samples, a low temperature GaN layer (730°C) has been grown on every quantum well before rising the temperature to standard values (900°C). The samples have been investigated by transmission electron microscopy and X-ray diffraction. Photoluminescence spectra have been measured as well. The influence of the LT-GaN has been investigated in regard to its influence on the structural and compositional quality of the sample.

Application of Graphics Processing Unit for In-Line Electron Holography

100%

Morawiec K. , Dłużewski P. , Kret S. , Szczepańska A. , Li T. , Sloan J.

Acta Physica Polonica A

2017

tom 131

nr 5

1353-1356

In the present work, software for exit electron wave reconstruction based on the iterative approach was implemented and a new method for drift-correction of the focal series was proposed.

TEM Study of the Structural Properties of Nanowires Based on Cd, Zn, Te grown by MBE on Silicon Substrates

84%

Kaleta A. , Kret S. , Sanchez A. , Bilska M. , Kurowska B. , Szczepańska A. , Płachta J. , Wojnar P. , Wojciechowski T.

Acta Physica Polonica A

2017

tom 131

nr 5

1399-1405

In this work we report on the atomic structures, elemental distribution, defects and dislocations of three types of semiconductor nanowires: ZnTe, CdTe, and complex ZnTe/(Cd,Zn)Te core/shell hetero-nanowires grown by a molecular beam epitaxy on (111) Si substrate using a vapor-liquid-solid mechanism. The structural properties and the chemical gradients were measured by transmission electron microscopy methods. The nanowires reveal mainly sphalerite structure, however wurtzite nanowires were also observed.