I want to understand the synthesis principle of more stable CdSe quantum dot and which synthesized particle we can use to make more efficient CdSe/PbSe quantum dot solar cell.
If any paper which can help me understand then please try to send me that one also :)
The QD by themselves is one question. But more important question for QD solar cells is which ligands you have/want to use. Ligands influence the stability of your QD and more importantly they define charge separation and charge transport!!!
Ideally, you need ligands that have nearly resonant orbital alignment with your QD of particular size. You can go around ligands making bare QD, for example by treating QD with hydrozine. But in this case you need to think more carefully about stability of the QDs (susceptibility to the atmosphere stuff, QD fusion, etc.).
you may want to have a look at Paul Alivisatos' papers. He is a worldwide expert in CdSe/CdS nanocrystals: http://en.wikipedia.org/wiki/Paul_Alivisatos
Dear Danylo Zherebetskyy ,
can u tell me in something detail about resonant orbital alignment ? if u have any study material or papers which help me to know that why ligands should have nearly resonant orbital alignment of quantom dot particle for it's stability then please try to provide me !
thnku so much :)
Briefly:
-you tune QD band gap by changing homo and lumo by themselves depending on the size of QD;
-ligand's homo/lumo levels are also affected by QD-size change: QD has dielectric constant (not equal 1), from classical electrostatics we know that electric field and charge distribution (orbitals) nearby a dielectric sphere are affected by size of a dielectric sphere.
For more details Look at papers:
-Nonmonotonic Size Dependence in the Hole Mobility of Methoxide-Stabilized PbSe Quantum Dot Solids; ACS Nano, 2013, 7 (8), pp 6774
-"PbS Nanoparticles Capped with Tetrathiafulvalenetetracarboxylate: Utilizing Energy Level Alignment for Efficient Carrier Transport" ACS Nano
- Badges
- Science topic
- Similar topics
- Chemistry
- Nanotechnology