I read that quantum rod is superior to quantum dot in terms of larger absorption area, linear polarised light, lower Auger rate and larger Stokes shift. But why fewer research works have used quantum rods as absorber material in the solar cell?
I want to fill in this research gap, but I wish to know what is the exact reason? Is it because of the inappropriate bandgap?
Dear @ Choon,
welcome!
The quantum dots are easy to manufacture and control than the quantum rods.
They are simply very small nanograins of compound semiconductors. They can be imbedded in base material to enhance its optical absorption characteristics.
Quantum rods are one dimensional columnar structure grown on a specific substrate. They are normally surrounded by air. Therefore the filling of the material is is always incomplete. This makes absorption voids in the structure.
One important reason is that the quantum dots are mechanically stronger than the rods that are very fragile.
So, the dots are more superior than the rods and therefore they prevailed.
Please for more information please refer to the book chapter: https://www.intechopen.com/books/solar-cells-new-approaches-and-reviews/quantum-dots-solar-cells
Best wishes
Dear @ Choon,
welcome!
The quantum dots are easy to manufacture and control than the quantum rods.
They are simply very small nanograins of compound semiconductors. They can be imbedded in base material to enhance its optical absorption characteristics.
Quantum rods are one dimensional columnar structure grown on a specific substrate. They are normally surrounded by air. Therefore the filling of the material is is always incomplete. This makes absorption voids in the structure.
One important reason is that the quantum dots are mechanically stronger than the rods that are very fragile.
So, the dots are more superior than the rods and therefore they prevailed.
Please for more information please refer to the book chapter: https://www.intechopen.com/books/solar-cells-new-approaches-and-reviews/quantum-dots-solar-cells
Best wishes
Colloidal quantum-confined semiconductor nanostructures are an emerging class of functional material that are being developed for novel solar energy conversion strategies. One of the largest losses in a bulk or thin film solar cell occurs within a few picoseconds after the photon is absorbed, as photons with energy larger than the semiconductor bandgap produce charge-carriers with excess kinetic energy, which is then dissipated via phonon emission. Semiconductor nanostructures, where at least one dimension is small enough to produce quantum confinement effects, provide new pathways for controlling energy flow and therefore have the potential to increase the efficiency of the primary photoconversion step. In this review, we provide the current status of research efforts towards utilizing the unique properties of colloidal quantum dots (nanocrystals confined in three dimensions) in prototype solar cells and demonstrate that these unique systems have the potential to bypass the Shockley-Queisser single-junction limit for solar photon conversion.
Many heavy-metal quantum dot (lead/cadmium chalcogenides such as PbSe, CdSe) semiconductors can be cytotoxic and must be encapsulated in a stable polymer shell to prevent exposure.[33] Non-toxic quantum dot materials such as AgBiS2 nanocrystals have been explored due to their safety and abundance; exploration with solar cells based with these materials
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