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According to the Bloch theorem and the symmetry of superlattice configuration, a new 3D finite element method is employed to calculate the miniband structure and density of state for well-aligned Ge/Si QDs array. This method can overcome the approximation of multi-dimensional Kronig-Penny model and constrain on QDs superlattice structure. The interaction of electronic structure among Ge/Si QDs with...
In this work, an efficient method is applied to calculate the miniband structure and density of states for well-ordered Ge/Si quantum dot (QD) array fabricated by combining the self-assemble bio-template and damage-free neutral beam etching. Within the envelop-function framework, this computational model surmounts theoretical approximations of the multi-dimensional Kronig-Penney method and the numerical...
This paper investigates the applications of nanocrystalline semiconductors, and in particular silicon nanostructures, in the areas of integrated photonics and photovoltaics. The fundamental principles, properties, and performance advantages resulting from the incorporation of nanostructures in photovoltaic and photonic devices are examined. Several device structures as well as fabrication and characterization...
Superlattice consisting of 10 alternate layers of a-Si with QDs and SiNx are incorporated as i-layer in a p-i-n solar cell using HWCVD method. Superlattice with QDs showed absorption coefficient in the range of ∼105–104 cm−1. Calculated optical bandgap of the SL with QDs (∼1.84 eV) is higher than the SL without QDs (∼1.79 eV) and this is attributed to QCE. The cells with QDs showed ISC= 1.806 µA and...
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