Abstract:
With the rapid depletion of the organic fuel reservoirs and the increasing demand of
renewable energy sources, significant research efforts have been focused on developing photovoltaic devices which are capable of having a superior efficiency compared to
the previous generations. Third generation solar cells, comprised of but not limited to
technological advancements such as tandem solar cells and perovskite solar cells, have
demonstrated potential in this domain. However, the presence of lead and other toxic
materials in the construction of such devices has prompted a search for an alternative to
these toxic materials in order to facilitate production of clean energy and to reduce the
concerns regarding the disposal of solar cells. In recent developments, the use of tin-based perovskites have garnered a interest as an alternative to lead-based perovskites
in the solar cell sector since they lack the toxicity and instability issues that are inherent to lead-based perovskites. In this work, a simulation study have been conducted
on a tandem solar cell composed of two tin-based perovskite materials in the top and
bottom absorber layers. The cesium tin iodide (Cs2SnI6) cell with 1.48 eV bandgap
has been used as the top cell while the methylammonium tin iodide (CH3NH3SnI3)
cell with 1.23 eV bandgap has been used as the bottom cell. The combination of these
two individual cells in a tandem cell initially resulted in a power conversion efficiency
(PCE) of 22.67%. Parametric analysis has been performed with the view to determine
the optimal choices for absorber layer thickness, ETL and HTL material selection and
thickness, defect density state in the absorber layer and interfaces, and the back contact
metal used in the construction of the solar cell. As a result of the enhancement of the
two cells, the open circuit voltage (Voc) was found to be 0.798 V, the short circuit current density measured at 37.54 mA/cm2
, with the fill factor (FF) being 76.61%. After
performing the mentioned optimizations of the solar device, a reasonable power conversion efficiency (PCE) of 22.96% was achieved. All the simulations of this work were
conducted using SCAPS-1D software utilizing AM 1.5G illumination.
Description:
Supervised by
Md. Sayeed Hasan Rifat,
Lecturer,
Department of Electrical and Electronic Engineering (EEE)
Islamic University of Technology (IUT)
Board Bazar, Gazipur, Bangladesh
This thesis is submitted in partial fulfillment of the requirement for the degree of Bachelor of Science in Electrical and Electronic Engineering, 2024
