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Charge transport characterization of P3HT thin-film organic semiconductor
Matija Filipčič, 2021, raz. nal. na višji ali visoki šoli

Opis: The focus of this diploma seminar is to describe different types of charge transport theory and models used for finding mobility in semiconductors, more specifically focused on P3HT thin-film organic semiconductor. It also describes the time-of-flight method, which was used to measure the experimental data for P3HT with time dependent current I(t) curve. Another data set was obtained by performing Kinetic Monte Carlo (KMC) simulations using Miller-Abrahams hopping formalism. KMC was used to determine the material disorder, simulate I(t) curve and transit time for every charge carrier. Simulated data, different transit times and mobilities were then finally compared with experimental, in order to find agreements between the two.
Ključne besede: charge transport, P3HT, thin-film organic semiconductor
Objavljeno: 15.09.2021; Ogledov: 159; Prenosov: 0
.pdf Polno besedilo (590,08 KB)

Vibrational spectra of am-Al 2 O 3 : tuning a parametric model.
Kurtović Jasmin, 2021, raz. nal. na višji ali visoki šoli

Opis: The present diploma seminar work has been dedicated first to the implementation of a procedure to calculate the vibrational density of states of two structural models of vitreous SiO 2 (v- SiO 2 ) and amorphous Al 2 O 3 (am-Al 2 O 3 ) models, and next to tune a parametric model for the calculation of the infrared (IR) spectra of am-Al 2 O 3 , in particular of the imaginary part of the dielectric function. The ground state of both structural models is obtained by relaxing the atomic structure by using the conjugate gradient method as implemented in the LAMMPS code. Vibrational frequencies and modes are obtained, in the harmonic approximation, by diagonalizing the dynamical matrices calculated for the given v-SiO 2 and am-Al 2 O 3 structural models. Dynamical matrices are obtained through a finite differences approach and vibrational density of states are plotted by applying Gaussian broadening. The calculation of the dielectric function requires the knowledge of the vibrational frequencies as well as the knowledge of the dynamical (or Born) charge tensors related to the atoms of the am-Al 2 O 3 structural model. For the latter model, a parametrization of the ab-initio Born charge tensors has been carried out with the purpose to allow for the fast calculation of the IR spectrum of any other am- Al 2 O 3 model without the need to calculate for it the Born charge tensors using expensive ab- initio methods. The parametrization of Born charge tensors takes into account, for aluminium atoms, only of the isotropic charge which depends on coordination number and average Al- O bond length of aluminium atoms, while for oxygen atoms coordinated to three Al atoms (75%), dynamical charges are parametrized also by the area bounded by aluminium atoms nearest neighbours of the 3-coordinated oxygen atom. Moreover for analyzing the dynamical charge tensors of 3-coordinated oxygen atoms a decomposition in terms of the representations of the spatial rotations was used. The IR spectrum obtained by means of the above described parametrization provides a good approximation to the IR spectrum obtained by using the ab- initio calculated dynamical charges, as it differs from it, on average, by around 5.1% which is much better (12%) than using a average isotropic charge model (i.e. diagonal Born charge tensors where each diagonal element is one third of the average isotropic charge).
Ključne besede: Vibrational spectra, am-Al 2 O 3, parametric model
Objavljeno: 15.09.2021; Ogledov: 161; Prenosov: 0
.pdf Polno besedilo (859,22 KB)

Least-square fit
Aleksander Đorđević, 2021, raz. nal. na višji ali visoki šoli

Ključne besede: least-square fit, non-linear regression, Levenberg-Marquardt algorithm
Objavljeno: 28.06.2021; Ogledov: 269; Prenosov: 0
.pdf Polno besedilo (469,84 KB)

Kvantni Hallov pojav v 2D materialih
Matevž Rupnik, 2021, raz. nal. na višji ali visoki šoli

Ključne besede: kvantni Hallov pojav, 2D materiali, Schrödingerjeva enačba, elektroni v električnem in magnetnem polju, grafen, Diracova enačba
Objavljeno: 28.06.2021; Ogledov: 290; Prenosov: 0
.pdf Polno besedilo (907,27 KB)

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