DHARMADASA, I, KALYANARATNE, N.D.P.S.R. and DHARMADASA, R (2013). Effective harvesting of photons for improvement of solar energy conversion by graded bandgap multilayer solar cells. Journal of the National Science Foundation of Sri Lanka, 41 (2), 73-80.Full text not available from this repository.
Various ways to harvest photons in the solar spectrum and heat energy from the surroundings have been considered by utilizing solid state physics principles. A graded bandgap multi-layer solar cell has been designed to absorb UV, visible and infrared radiation, and to combine impact-ionization and impurity photovoltaic (PV) effect to enhance photo-generation of charge carriers and the collection. The above theoretical concepts were experimentally tested using the well researched material system, GaAs/AlxGa(1-x)As. The highest reported Voc ~ 1175 mV together with the highest possible fill factors (FFs) in the mid 80 %’s, have been achieved for the initial devices. The overall efficiency achieved using only two growths is ~ 20 %. As expected from the initial design, the impurity PV effect is experimentally observed producing Voc values in the range of 650-900 mV under complete darkness for the GaAs/AlxGa(1-x)As based devices. Both the theoretical concepts and experimental results are presented in this paper.
|Research Institute, Centre or Group:||Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group|
|Depositing User:||Helen Garner|
|Date Deposited:||19 Aug 2013 09:59|
|Last Modified:||10 Mar 2014 09:20|
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