How are electrons and holes transported? In a typical semiconductor solar cell, you have a diode, which tend to force electrons and holes to go separate ways. In quantum dot, the quantum dot with the tuneable bandgap, is capped by organic ligands, which I assume are insulators? Won't the electron and hole be trapped inside the dot...and then dissipate their energies to form excitons...and then just recombine? Are the dots somehow "electronically connected" with the typical semiconductor substrate which form PN junctions?
Hi I'm a high school student (junior) and I'm currently working on a QD-Nanopt. framework for NADH photo regeneration . Why do trap sites form on the surface of QDs? Thank you
Due to the toxicity of cadmium and lead, I have been exploring graphene quantum dots. It is more difficult to determine the photoluminescence response (band gap) of graphene quantum dots due to functional groups, edge asperities, defects etc. However, they are environmentally-friendly and cost-effective to produce and use.
Thank you very much... i´m working with Carbon Quantum Dots, and i present a seminar, and they tell that what i was talking about, are simple carbon nanoparticles, so i have a cuestion for you. What would you think is the most important property of a quantum dot? and how can i say... this carbon nanoparticles, are quantum dots?. My quantum dots have fluorescent in green visible spectra. I´m reading a lot about quantum confinament. But im very lost on what i can do to verify the quantum confinament. I´m making a photocatalyst so the explication of the light energy that we get frome the sun was very helpful. Thank you very much to you Sr.
UV-Vis spectroscopy gives proof of QD formation. Blue shift in the spectra indicates QD property. There are other ways also to confirm the qd formation. Like HRTEM and XRD spectroscopy.
Video was very informative.Hello Sir, My question is that though quantum dots are nanocrystals , Can we see them in solid form such as we see other nanoparticles such as Iron oxide, graphene, Gold.
I would definitely take your class if every lecture was like this!
The best tutor.
Great thanks!
Thank-you, Brian!
Very good lecture and excellent didactics.
what a super presentation!
What an explanation!!!
Loved the presentation and the idea!
Thank you, professor.
Great Dr. Bryan... I have learned a lot about the quantum dots and their application, Thanks
Thank you, great presentation!
What a clear explanation！
How are electrons and holes transported?
In a typical semiconductor solar cell, you have a diode, which tend to force electrons and holes to go separate ways. In quantum dot, the quantum dot with the tuneable bandgap, is capped by organic ligands, which I assume are insulators? Won't the electron and hole be trapped inside the dot...and then dissipate their energies to form excitons...and then just recombine?
Are the dots somehow "electronically connected" with the typical semiconductor substrate which form PN junctions?
how you get the relation between band gap of QD and bulk. can you provide a reference of it...???
It is awesome but how much voltage can be get generated
Hi Dr. Bryan,
Could you mind to telling me,
How to get Power In (Pin) in solar module where shown in minutes 9:04,
So easy to understand.
Hi I'm a high school student (junior) and I'm currently working on a QD-Nanopt. framework for NADH photo regeneration . Why do trap sites form on the surface of QDs? Thank you
Why are they in healthcare products?
Due to the toxicity of cadmium and lead, I have been exploring graphene quantum dots. It is more difficult to determine the photoluminescence response (band gap) of graphene quantum dots due to functional groups, edge asperities, defects etc. However, they are environmentally-friendly and cost-effective to produce and use.
The question is can spent uranium produce energy in a specific band gap that can be converted to electricity ?
Could chlorophyll be used to make the dots? Just wondering if natural and non toxic material like that is possible.
Thank you very much... i´m working with Carbon Quantum Dots, and i present a seminar, and they tell that what i was talking about, are simple carbon nanoparticles, so i have a cuestion for you. What would you think is the most important property of a quantum dot? and how can i say... this carbon nanoparticles, are quantum dots?. My quantum dots have fluorescent in green visible spectra. I´m reading a lot about quantum confinament. But im very lost on what i can do to verify the quantum confinament. I´m making a photocatalyst so the explication of the light energy that we get frome the sun was very helpful. Thank you very much to you Sr.
UV-Vis spectroscopy gives proof of QD formation. Blue shift in the spectra indicates QD property. There are other ways also to confirm the qd formation. Like HRTEM and XRD spectroscopy.
Video was very informative.Hello Sir, My question is that though quantum dots are nanocrystals , Can we see them in solid form such as we see other nanoparticles such as Iron oxide, graphene, Gold.
Thank you
Why do not most of the researchers focus on the Si QDs? They are cheap, non toxic and they gave promising results to be the alternative solution.
Good luck everyone....
Galium arsenide
FYE students here?
Yes :P
This is a nightmare for people with Trypophobia....
Just saying