Abstract:
In this thesis heterojunction formation of carbon nanotube (CNT) with silicon (Si) is
studied to design new kind of solar cells. The nanoscale structure, high mobility and high
physical and electrical properties of CNT can be used to improve the efficiency of solar
cell. Here we analyzed i-n (CNT in i-side and Si in n-side) heterojunction solar cells. By
varying the diameter of carbon nanotube (CNT), the bandgap can be varied according to
our desired value. Here we vary the diameter of CNT around I nm to check the characteristics of this solar cell. To form heterojunction of CNT with Si we assumed
CNT as intrinsic and an equation has been developed to find the band diagram. We
calculated the ShOlt circuit current density (Jsc) by using the data for terrestrial solar
irradiance with Air Mass 1.5. Calculation has been made assuming solar cell is ideal. To
calculate Fill Factor and Efficiency for different diameter of CNTs. we have calculated
the total current density and the open circuit voltage. MA TLAB software has been used
for calculation. P-V curve is also plotted to find the maximum power point and from that fill factor (FF) and efficiency (17) is calculated. In this paper we show different open
circLlit voltage. short circuit current, fill factor and efficiency for different diameter of
CNT. All the parameters decrease with the decrement of diameters of CNT. In oLir model
the best efficiency is 22.663% for of 1.92nm diameter of CNT. We compared the
efficiency variation for different diameters of CNT and proposed a range of CNT diameter to design the CNT-Si heterojunction solar cells, in which range efficiency
remains stable and higher.
Description:
This thesis submitted in partial fulfillment of the requirements for the degree of B.Sc in Electrical and Electronic Engineering of East West University, Dhaka, Bangladesh.
