Rodhuan, Mirza Basyir (2023) Computational modelling of light-matter interaction in amorphous silicon with quantum dot for solar cell applications. Masters thesis, Universiti Tun Hussein Onn Malaysia.

Preview	Text 24p MIRZA BASYIR RODHUAN.pdf Download (723kB) | Preview
	Text (Copyright Declaration) MIRZA BASYIR RODHUAN COPYRIGHT DECLARATION.pdf Restricted to Repository staff only Download (324kB) | Request a copy
	Text (Full Text) MIRZA BASYIR RODHUAN WATERMARK.pdf Restricted to Registered users only Download (4MB) | Request a copy

Abstract

As the world population rises, energy needs, including power generation, are becoming critical; using photovoltaic technologies like amorphous silicon solar cells (aSiSC) to harness solar energy might benefit global concerns. Recent investigations stated that aSiSCs were poor short-wavelength absorbers. Quantum dot (QD) technology may be applied to aSiSC to improve optical absorptions and electric fields since the QDs’ bandgap is tunable, spanning a larger electromagnetic spectrum. However, the computational approach to QD properties is not yet computationally summarised. Here, this work focuses on the fundamental design of a 3D quantum dots amorphous silicon solar cell (aSiQDSC) model with various core sizes of core/shell QD to identify the optical absorption peak, electric field profiles, and light-matter interaction process. This study used COMSOL Multiphysics software to simulate utilising the finite element model (FEM). The aSiSC model’s optical absorption peaked at 736 nm at 41.83%. For aSiQDSC models, type-I QD: cadmium selenide/zinc sulphide (CdSe/ZnS) with 0.5 nm core radius produced the maximum optical absorption, 46.01% at 642 nm, compared to type-II: cadmium telluride/cadmium selenide (CdTe/CdSe) and inverted-type-I: cadmium telluride/indium phosphide (CdTe/InP). As the QD core radius diminished, optical absorption peaks and electric fields rose. The quantum confinement effect (QCE) causes multi-exciton generations (MEG) within the QD to provide advantages to aSi. This study continued by combining nanocavity (NC) and nanoantenna (NA) to increase optical absorption and electric fields. In the presence of gold (Au) rectangular (5×5×3) nm nanosheets NA, the model showed higher optical absorption of 46.58% at 642 nm due to strongly restrained electric fields, creating a hot spot in the 0.5 nm nanogap resulting in localised surface plasmon resonance (LPSR). Ultimately, the largest cavity aperture hemi-ellipsoidal NC with 8.0 nm in the aSiQDNANCSC model amplified the optical absorption with 47.00% at 641 nm. Computationally, this model design is an environment-friendly, high-absorption, and electric fields SC that will enable future research and fabrication

Actions (login required)

View Item