Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"Colloidal quantum dots"”.
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Photodetectors based on colloidal quantum dots
… work demonstrating photocurrent enhancement in quantum-dot (QD) solids via post-deposition chemical annealing and by recent successes incorporating single monolayers of QDs in light-emitting devices (QD-LEDs), we set out to develop thin-film, layered photodetectors in which the active layer is a …
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Deposition of colloidal quantum dots by microcontact printing for LED display technology
… thesis demonstrates a new deposition method of colloidal quantum dots within a quantum dot organic light-emitting diode (QD-LED). A monolayer of quantum dots is microcontact printed as small as 20 ,Lm lines as well as millimeter scale planes, and the resulting devices show quantum efficiencies …
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Sub-10-nm electron-beam lithography for templated placement of colloidal quantum dots
… technique to control the position of individual colloidal quantum dots smaller than 10 nm.
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Hybrid light emitting diodes based on solution processed polymers, colloidal quantum dots, and colloidal metal nanoparticles
… devices based on polymer, polymer/PbS quantum dot, and polymer/silver nanoparticle hybrid materials. Solution based materials and organic/inorganic hybrid light emitting diodes attracted significant interest recently due to many of their advantages over conventional light emitting …
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Optical studies of colloidal quantum dots : optical trapping with plasmonic nanoapertures and thermal recovery from photoinduced dimming
… main goals. The first has been to develop single colloidal quantum dot (QD) absorption as a new spectroscopic tool for investigating single QD electronic properties, dynamics, and inhomogeneities. In an important step towards achieving this goal, QDs were introduced into the field of optical …
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Colloidal quantum dot based light emitting devices on silicon substrate
… of light sources within CMOS circuitry. Colloidal semiconductor nanocrystals have narrow emission spectra which makes them an excellent choice for active media in optoelectronic applications. Moreover, solution processability of colloidal quantum dots makes processing and integration on …
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Architecting the Optics, Energetics and Geometry of Colloidal Quantum Dot Photovoltaics
… a low cost solution to global energy concerns. Colloidal quantum dots are one material that can be easily synthesized in and deposited from solution. These nanoparticles also offer the unique ability to select the desired optical and electrical characteristics, all within the same materials …
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A hybrid approach towards on-chip visible lasers
… has expanded to include organic molecules; colloidal nanocrystals such as quantum dots, quantum rods, and quantum wells or nanoplatelets; perovskite semiconductors; and perovskite nanocrystals. A key feature of these materials is the capability to engineer their energy levels, e.g., via …
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Understanding colloidal quantum dot excitation with solution photon correlation fourier spectroscopy
Colloidal quantum dots (CQDs) have useful absorption and emission properties but exist in inhomogenous batches. Solution photon correlation fourier spectroscopy (S-PCFS) combines interferometry with fluorescence correlation spectroscopy (FCS) to measure the spectral correlation of the average …
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First-principles studies of defects in colloidal nanocrystals
… lead halide perovskite PV, organic PV and colloidal quantum dot (CQD) PV. Colloidal quantum dots are semiconducting nanocrystals that exhibit size tunable electronic and optical properties.
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Charge transport in nanopatterned PbS colloidal quantum dot arrays
… charge transport in nanopatterned arrays of PbS colloidal quantum dots using conventional two-probe measurements and an integrated charge sensor. PbS dots are synthesized in solution with an organic ligand or cap that serves to passivate the surface of the dot, provide a tunnel barrier as well as …
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Solution-processable, mechanically-flexible lasers
… materials are used: organic semiconductors and colloidal quantum dots. Encapsulation schemes compatible with the mechanical flexibility of the final devices, e.g. using transparent polymers or flexible glass membranes, are proposed and studied in order to extend the operational lifetime of the …
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Principles of quantum dot photophysics and applications to luminescent downshifting
Colloidal quantum dots (QDs) exhibit remarkable size-tunable optical properties including broad absorbance and bright, narrow emission. This thesis presents efforts to utilize, manipulate, and expand these properties. Despite the wide range of applications that benefit from multiband spectral …
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Photoluminescent quantum-dot light emitting devices controlled by electric field induced quenching
Colloidal quantum dots (QDs) have been promising luminophores due to their bright, pure, and tunable colors. The ability to control the emission properties of QDs has far-reaching potential applications for a new generation of display and lighting technologies. The emission control of QDs in a QD …
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Langmuir Blodgett films of colloidal silicon quantum dots for hot carrier photovoltaics
Colloidal quantum dots (QDs) materials have been found on a promising path to achieve practical low-cost and high-efficiency third generation solar cells. The solution processability of colloidal QDs enables low-cost fabrication of various kinds of colloidal QDs solar cells. Moreover, favourable …
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Resonant energy transfer in light harvesting and light emitting applications
… and the absorption of organic dyes or colloidal quantum dots (QDs) are engineered so that the excitations in the semiconductor heterostructure can be transferred to the light emitters by means of resonant energy transfer. The emitters subsequently emit colour-tunable light ranging from …
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Electron-beam lithography towards the atomic scale and applications to nano-optics
… photon sources, i.e., 5-nm-diameter colloidal quantum dots. Second, we fabricated sub-20 nm plasmonic antennas designed to engineer surface and volume plasmons in the ultraviolet region of the electromagnetic spectrum (3 to 30 eV).
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Development of colloidal quantum dot and lead halide perovskite light emitting devices
… semiconductors, such as organic molecules, colloidal quantum dots (QDs) and lead halide perovskites, have emerged as top candidates for light emitting materials. One key feature of these materials is their bandgap tunability, e.g. via size or chemical composition, allowing for their emission …
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Development of low-temperature solution-processed colloidal quantum dot-based solar cells
… organic semiconductors and inorganic colloidal quantum dots (QDs) are potential alternatives to conventional solar cells fabricated via vacuum or high-temperature sintering processes for large-area, high-throughput, and low-cost manufacturing. In this work, we explored two types of …
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Physical properties and design of light-emitting devices based on organic materials and nanoparticles
… (LEDs) based on organic semiconductors and colloidal quantum dots (QDs). This hybrid material system has several advantages over crystalline semiconductor technology; first, it is compatible with inexpensive fabrication methods such as solution processing and roll-to-roll deposition; second, …
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