Design of Novel Tandem Solar Cell Devices

  • Sara Alshkeili

Student thesis: Master's Thesis


Conventional single junction solar cells are inherently limited with regard to their conversion efficiency due to a number of losses. Dual junction tandem solar cell devices absorb a much broader range of the incident solar spectrum and have therefore the advantage of achieving higher efficiencies compared to single junction solar cells. In this work, we designed novel tandem solar cell devices with different combinations of semiconductor materials and bandgaps using Si/Ge, AlGaAs/CIGS and CdTe/InGaAs. Thin tandem devices structures with a specific configuration allowing the extraction of the maximum power from the top and bottom cells were considered. These tandem devices were optimized in terms of the thicknesses and doping concentrations of their active layers, and efficiencies up to 32.3% were predicted under standard testing conditions (STC). The optimal tandem devices were then simulated under different operating temperatures, incident spectra and light intensities. It was shown that, in addition to their promising performance in conventional PV, our designed devices are suitable for applications in thermal PV (TPV) as well as in concentrated PV (CPV).
Date of AwardAug 2013
Original languageAmerican English
SupervisorMahieddine Emziane (Supervisor)


  • Solar Cell Devices; Photovoltaic cells; Tandem Devices.

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