The Effect of Shallow Impurities on the Light Absorption by the Nanocrystals CdS

  • V. I. Boichuk Physics Department, Ivan Franko Drohobych State Pedagogical University
  • R. Ya. Leshko Physics Department, Ivan Franko Drohobych State Pedagogical University
  • D. S. Karpyn Physics Department, Ivan Franko Drohobych State Pedagogical University
Keywords: acceptor and donor imputities, exciton, light absorption coefficient, nanocrystal

Abstract

The energy of quantum transitions of exciton-impurity states in a heterosystem with nanocrystals is calculated. The absorption spectra associated with the indicated transitions are analyzed. It is qualitatively shown that broad luminescence bands in the red region are related to the impurity acceptor states, and the high narrow ones in the violet region to pure excitonic states and excitonic states interacting with the ion of a donor. The satisfactory quantitative agreement of our calculations with experimental data for high energy luminescence bands is obtained.

Author Biography

R. Ya. Leshko, Physics Department, Ivan Franko Drohobych State Pedagogical University

LESHKO Roman Yaroslavovich - Candidate of Sciences (Physics and Mathematics), Associate Professor of the Department of Physics, Drohobych State Pedagogical University named after Ivan Franko. Born on November 27, 1984 in Truskavets, Lviv region.

EDUCATION. Graduated from Truskavets Secondary School No. 1 (2001) with a gold medal, Drohobych State Pedagogical University named after Ivan Franko, specializing in PMSO. Physics and Fundamentals of Informatics "(2006) with honors, 2007 - Master's Degree in Drohobych State Pedagogical University named after Ivan Franko, specialty" PMO. Physics "(graduated with honors). Candidate's dissertation on the topic: "The theory of hole, exciton, and impurity states in spherical nanoheterosystems" defended in the specialized academic council D 76.051.01 at Chernivtsi National University named after Yuri Fedkovych (2010).

EMPLOYMENT. In 2010, he began his career at the Department of Theoretical Physics and Methodology of Teaching Physics at the Drohobych State Pedagogical University named after Ivan Franko in the positions of: Teacher (2010-2013), Senior Lecturer (2013), Associate Professor (since 2015). Awarded the Lviv Regional State Administration Award (2013).

SCIENCE. Scientific interests are connected with theoretical research of quasiparticle states and optical properties of ideal and defective nanosystems. This area of ​​study is represented by more than 60 scientific works.

References

C.C. Yang, L.C. Liu, S.H. Chang. Eigenstates and fine structure of a hydrogenic impurity in a spherical quantum dot. Phys. Rev. B 58, 1954 (1998). https://doi.org/10.1103/PhysRevB.58.1954

V. Holovatsky, I. Bernik, O. Voitsekhivska. Oscillator strengths of quantum transition in spherical quantum dot GaAs/AlxGa1−As/GaAs/AlxGa1−xAs with on-center donor impurity. Acta Phys. Pol. A 125, (2014). https://doi.org/10.12693/APhysPolA.125.93

V. Holovatsky, O. Makhanets, O. Voitsekhivska. Oscillator strengths of electron quantum transitions in spherical nanosystems with donor impurity in the center. Physica E: Low-Dimensional Systems and Nanostructures 41, 1522 (2009). https://doi.org/10.1016/j.physe.2009.04.027

V.I. Boichuk, I.V. Bilynskyi, R.Ya. Leshko, L.M. Turyanska. The effect of the polarization charges on the optical properties of a spherical quantum dot with an off-central hydrogenic impurity. Physica E: Low-Dimensional Systems and Nanostructures 44, 476 (2011). https://doi.org/10.1016/j.physe.2011.09.025

V.I. Boichuk, I.V. Bilynskyi, R.Ya. Leshko, L.M. Turyanska. Optical properties of a spherical quantum dot with two ions of hydrogenic impurity. Physica E: Low-Dimensional Systems and Nanostructures 54, 281 (2013). https://doi.org/10.1016/j.physe.2013.07.003

V.I. Boichuk, R.Ya. Leshko, I.V. Bilynskyi, L.M. Turyanska. Off-central acceptor impurity in a spherical quantum dot. Cond. Matt. Phys. 15, 33702 (2012). https://doi.org/10.5488/CMP.15.33702

V.I. Boichuk, R.Ya. Leshko, D.S. Karpyn. Analysis of the effect of polarization traps and shallow impurities on the interlevel light absorption of quantum dots. Cond. Matt. Phys. 20, 43704 (2017). https://doi.org/10.5488/CMP.20.43704

V.A. Holovatsky, I.B. Frankiv. Oscillator strength of quantum transition in multi-shell quantum dots with impurity. J. Optoelectr. Adv. Mater. 15, 88 (2013).

G. Rezaei, M.R.K. Vahdani, B. Vaseghi. Nonlinear optical properties of a hydrogenic impurity in an ellipsoidal finite potential quantum dot. Current Appl. Phys. 11, 176 (2011). https://doi.org/10.1016/j.cap.2010.07.002

A. H¨asselbarth, A. Eychm¨uller, H. Weller. Detection of shallow electron traps in quantum sized CdS by fluorescence quenching experiments. Chem. Phys. Lett. 203, 271 (1993). https://doi.org/10.1016/0009-2614(93)85400-I

D.V. Korbutyak, S.V. Tokarev, S.I. Budzulyak, A.O. Kuryk, V.P. Klad'ko, Yu.O. Polishchuk, O.M. Shevchuk, G.A. Il'chuk, V.S. Tokarev. Optical and structural defect characteristics of nanocrystals CdS:Cu and CdS:Zn synthesized in polymeric matrices. Fiz. Khim. Tv. Tila 14, 222 (2013).

A.I. Savchuk, I.D. Stolyarchuk, T.A. Savchuk, M.M. Smolinsky, O.A. Shporta, L.M. Shynkura. Monitoring of incorporation of magnetic ions into II–VI semiconductor nanocrystals by optical and magneto-optical spectroscopy. Thin Solid Films 541, 79 (2013). https://doi.org/10.1016/j.tsf.2012.10.127

D.V. Korbutyak, O.V. Kovalenko, S.I. Budzulyak et al. Light-emitting properties of quantum dots in semiconductor compounds A2B6. Ukr. Fiz. Zh. Oglyady 7, 48 (2012).

D.F. Fanga, Z.M. Zhangb, Z.P. Wangb, Z.J. Dinga. Photoluminescence of CdS/ZnS core/shell quantum dots. Physics Procedia 32, 920 (2012). https://doi.org/10.1016/j.phpro.2012.03.657

A. Medvid, V.G. Litovchenko, D. Korbutjak, S.G. Krilyuk, L.L. Fedorenko, Y. Hatanaka. Influence of laser radiation on photoluminescence of CdTe Radiation Measurements 33, 725 (2001). https://doi.org/10.1016/S1350-4487(01)00092-0

G. Bastard. Wave Mechanics Applied to Semiconductor Heterostructures (Les Editions de Physique, 1988).

I.M. Kupchak, D.V. Korbutyak, S.M. Kalytchuk. The Stokes shift in quantum dots in CdTe. Zh. Fiz. Doslid. 14, 2701 (2010).

Al.L. Efros, M. Rosen. Band-edge exciton in quantum dots of semiconductors with a degenerate valence band: Dark and bright exciton states Phys. Rev. B 54, 4843 (1996). https://doi.org/10.1103/PhysRevB.54.4843

V.I. Boichuk, I.V. Bilynskyi, I.O. Shakleina, I. Kogoutiouk. Dielectric mismatch in finite barrier cubic quantum dots. Physica E: Low-Dimensional Systems and Nanostructures 43, 161 (2010). https://doi.org/10.1016/j.physe.2010.06.031

Published
2018-12-09
How to Cite
Boichuk, V., Leshko, R., & Karpyn, D. (2018). The Effect of Shallow Impurities on the Light Absorption by the Nanocrystals CdS. Ukrainian Journal of Physics, 63(12), 1088. https://doi.org/10.15407/ujpe63.12.1088
Section
Semiconductors and dielectrics