MoS2 For Photovoltaics Applications

  • Wafa Sulainman Alnaqbi

Student thesis: Master's Thesis

Abstract

As the energy demand is continuously increasing, due the rapid population, and economic growth, more and more countries around the world start to employ the available renewable energy resources for generating electricity to meet the energy demand, knowing that the conventional fossil fuel energy sources will come to its end sometime soon. Not only to face the problem of the depletion of the conventional energy resources, but also to help in decreasing the rate of the increase in the earth temperature caused by the global warming, which is mainly occur due to the large amount of the emission in the atmosphere that is released when the conventional energy resources are burned. The solar energy is one of the renewable energies that has grown lately, it can be harnessed through solar cells. Several studies have been conducted to improve the solar cell performance, at low cost. These studies included investigating different materials, and different structures of the solar cells, 2D material was one of the materials that has attracted the researchers to test them in solar cells due to their unique electrical, and optical properties. Molybdenum disulfide (MoS2) is one of these 2D materials which have been investigated lately due to its good semiconducting properties, and its abundance in earth. One of the special properties about the MoS2, and the 2D materials, is that they have a tuneable band gap that is affected by the layer thickness, which make it suitable material for various applications. This thesis has focus on synthesising and testing MoS2 for the applications in the solar cells. Two forms of MoS2 were synthesized, MoS2 nanoparticles through the chemical exfoliation method, and MoS2 flakes through the mechanical exfoliation. The MoS2 nanoparticles was selected to fabricate MoS2 NPs/ low temperature Ge junction, and MoS2 NPs/ Si solar cell, as it shows a better coverage of the substrate than the MoS2 flakes. The optical characterization of the synthesized MoS2 NPs showed how it is highly increased the absorption, and this was observed in the performance of the fabricated solar cell, as coating a p-Si substrate with the synthesised MoS2 NPs has increase the generated current density. The results in this thesis demonstrate a proof of concept with a working solar cell and optical device. Moreover, it shows that the MoS2 can be used in future solar cell applications.
Date of AwardNov 2021
Original languageAmerican English

Keywords

  • 2D materials
  • Solar
  • Photovoltaic
  • Molybdenum disulfide (MoS2)
  • Exfoliation.

Cite this

'