Impurity effects on binding energy, diamagnetic susceptibility and photoionization cross-section of chalcopyrite AgInSe₂ nanotadpole

Abstract

Recently the interest in chalcopyrite semiconductor nanostructures has increased because of their non-toxicity and their wide direct bandgap. Likewise, structures with non-trivial geometry are particularly interesting because of their electronic, optical, and magnetic properties. In the current article, the finite element method was used in conjunction with the effective mass approximation to theoretically investigate the properties of a chalcopyrite AgInSe2 nanotadpole in the presence of an hydrogen like shallow off-center impurity. The morphology of the nanotadpole gives it excellent hydrodynamic properties and is ideal for a wide range of applications. The probability densities for various impurity positions and energy levels were obtained. The results suggested a strong dependence of the behavior of the electron on the impurity positions and the orientation of the wave function. The investigation of the nanotadpole’s energy spectra and their comparison with the cylindrical and spherical quantum dots suggest that the spectrum has degenerate states similar to the spherical case, however at some ranges, the levels behave similarly to the cylindrical case. The binding energy's dependence on the nanotadpole's size and the impurity position was obtained. The dependence of the diamagnetic susceptibility on the impurity position was calculated. An extensive investigation of the photoionization cross-section was carried out for the ground and the first two excited states as the initial states and the first twenty excited states as the final states.

Photoluminescence spectra in GaAs biconical quantum dots

“…In this regard, one of the most valuable numerical tools at our disposal is the finite element method (FEM). Among these numerical methods, FEM stands out as a powerful technique for investigating the electronic structure of quantum dots (QDs) 21,22 . By representing continuous variables as discrete values on a grid or mesh, FEM allows for the efficient and speedy resolution of the eigenvalue problem.…”

Single electron states and intraband absorption in dumbbell quantum dot

“…Concurrently, QDs with non-standard geometries have garnered substantial interest due to their intricate nature, yielding novel and compelling phenomena. Among this category lie structures like dumbbells, nanostars, bicones, toruses, and others [14][15][16][17][18][19] .…”

“…One of the most interesting shapes with complex geometry is the dumbbell shaped quantum dots 14,[22][23][24][25][26][27] . They can be used in various applications, such as spatial localization, electron entanglement, exciton binding energy 22,23 , solar energy conversion systems and renewable energy 24 , multicarrier dynamics 25 , optoelectronic devices 15,26 .…”