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PbS Colloidal Quantum Dot Light Emitting Field-Effect Transistors

Smith, S.N. (2014) PbS Colloidal Quantum Dot Light Emitting Field-Effect Transistors. Bachelor's Thesis, Physics.

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This research is dedicated to Light Emitting Transistors made with PbS quantum dots as active layer. PbS quantum dots with Oleic Acid as ligands were spin coated on a bottom gate bottom contact Si/SiO$_2$ substrate. After deposition of a monolayer of QDs the Oleic Acid have been replaced by shorter and bi-functional molecules ethane dithiol. Afther ligand exchange the layer became conductive. Electroluminescence has been detected clearly dependent on the drain current have been detected. This follows the expectation, since this dependence has been shown in organic light emitting transistors. However, no gate voltage dependence could be detected. A huge redshift between photoluminescence on glass substrates and electroluminescence on silicon substrates was detected. This is probably due to different sintering rates caused by different heat conductions. It can be concluded that QD field-effect light emitting devices are promising but further investigation should be performed. The most important next step could be to prove gate voltage dependency and measure EQE, but also different device structures have to be investigated.

Item Type: Thesis (Bachelor's Thesis)
Degree programme: Physics
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 15 Feb 2018 08:02
Last Modified: 15 Feb 2018 08:02

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