Crystal Growth and Atom Diffusion in (Cu)ZnTe/CdTe via Molecular Dynamics

R Aguirre and JJ Chavez and JJ Li and XW Zhou and SF Almeida and C Wolden and D Zubia, IEEE JOURNAL OF PHOTOVOLTAICS, 8, 594-599 (2018).

DOI: 10.1109/JPHOTOV.2017.2782565

Molecular dynamics (MD) simulations and experimental evaporation were applied to study the growth of evaporated (Cu) ZnTe on mono-and polycrystalline CdTe. The simulated structures show polytypism and polycrystallinity, including texturing and grain boundaries, diffusion, and other phenomena in excellent qualitative agreement with experimental atomic probe tomography, transmission electron microscope, and secondary ion mass spectrometry. Results show formation of Cu clusters in nonstoichiometric growths even at early stages of deposition. Results also show significantly faster diffusion along defected regions (uncorrelated CdTe grain boundaries) as compared with more highly crystalline areas (high-symmetry grain boundaries and pristine regions). Activation energies and pre-exponential factors of Cu, Zn, and Te diffusion were determined using simulation. The MD model captures crystal growth phenomena with a high degree of fidelity.

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