Quantum Efficiency of CdS, CdSe and TiO2 Quantum Dot Solar Cells
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Date
2017-07-20
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Abstract
The increasing world crises of clean energy supply become global issues in
recent years. So, it is of importance to develop solutions for these problems. Solar
energy is one of the promising renewable energy sources. It has a great potential
since that the surface of the earth is receiving enough amount of energy for
suppling global demand over the year. One of the main shortcomings in solar cell
devices is the low quantum efficiency. Due to its superior characteristics, QD
nanocrystals are proposed for high efficiency solar cells.
This work devotes to study quantum efficiency of CdS/ZnO, CdSe/ZnO II-VI
and TiO2/MgZnO IV-VI QD solar cells. These structures are covers the range of
1.84 3.2 eV
from the emission spectrum. In chapter two; assuming the quantum
disk shape of the QDs, their band structures were calculated for different QD
heights
( ) h
and radii
( ) . The QD sizes studied are;
h nm 2 12,13,14nm
and
h nm 1, 3 , 13nm
Then, assuming QD layers are n- and p- doped for CdS/ZnO,
CdSe/ZnO while TiO2 QDs was n- doped and MgZnO barrier was p- doped. Their
absorption spectra were calculated in the same chapter. Mainly, there are two
absorption peaks. Reducing QD height degrades the peak in considerable amount
and reduces the width of the spectrum