Photocarrier Radiometry Characteristics of PbS Colloidal Quantum Dot Films
Colloidal quantum dot materials have pertinent applications in optoelectronic devices such as solar cells and photodetectors.Photocarrier radiometry technology is used to determine the exciton transport characteristics of a PbS colloidal quantum dot film containing trap states.A theoretical model ignoring net carrier transport between quantum dots is established,and the effects of exciton transport characteristics on photocarrier radiometry signals are subsequently simulated and analyzed.Finally,by conducting a frequency sweeping photocarrier radiometry experiment with different excitation powers,combined with the established exciton transport model,a variety of material parameters such as the effective exciton lifetime,carrier capture rate,and decapture lifetime are extracted.The experimental results confirm the validity of the proposed theoretical model.
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