Judith L. MacManus-Driscoll

Learn More
Fluorene-free perovskite light-emitting diodes (LEDs) with low turn-on voltages, higher luminance and sharp, color-pure electroluminescence are obtained by replacing the F8 electron injector with ZnO, which is directly deposited onto the CH3NH3PbBr3 perovskite using spatial atmospheric atomic layer deposition. The electron injection barrier can also be(More)
Polarization-resolved terahertz (THz) time-domain spectroscopy was utilized to examine the complex refractive index of lanthanum aluminate (LaAlO3), a rhombohedrally distorted perovskite that exhibits crystallographic twin domains. The uniaxial anisotropy of the refractive index was quantified. The ellipticity of THz radiation pulses after transmission(More)
Arrays of free standing nanorods or nanowires are of great interest for applications in data storage, catalysis, sensing, field emission, and optoelectronic devices. [1–4] Hybrid solar cells, for example, attempt to combine nanostructured semiconducting metal oxides with organic semiconductors to produce efficient photovoltaics at low cost. An ideal(More)
ZnO/P3HT devices, for example, indicated that when functionalized P3HT was used to ensure intimate mixing of the two phases, all singlet excitons created in the polymer were quenched by ZnO via electron transfer from the P3HT to ZnO (quantitative charge generation). [ 3 ] Recently, we demonstrated internal quantum effi ciencies of over 50% in ordered(More)
A novel device structure is developed, which uses easy-to-grow nano scaffold films to localize oxygen vacancies at vertical heterointerfaces. The strategy is to design vertical interfaces using two structurally incompatible oxides, which are likely to generate a high-concentration oxygen vacancy. Non-linear electroresistance at room temperature is(More)
An alternative water–ethanol zinc nitrate solution is demonstrated to completely eliminate macroscopic defects that are normally prevalent in ZnO films electrochemically deposited from aqueous zinc nitrate solutions. The inclusion of 25% ethanol (by volume) reduces the surface tension of the mixture and eliminates bubble formation on the conducting glass(More)
With particular focus on bulk heterojunction solar cells incorporating ZnO nanorods, we study how different annealing environments (air or Zn environment) and temperatures impact on the photoluminescence response. Our work gives new insight into the complex defect landscape in ZnO, and it also shows how the different defect types can be manipulated. We have(More)
The morphology in organic photovoltaics plays a key role in determining the device efficiency. We propose a method to fabricate bilayer devices with controlled nanostructured interfaces by combining nanoimprinting and lamination techniques. This technique allows us to achieve a network structure of donor-acceptor material with a ϳ80 nm periodicity and ϳ40(More)
We, using LSMO:ZnO nanocomposite films as a model system, have studied the effect of film thickness on the physical properties of nanocomposites. It shows that strain, microstructure, as well as magnetoresistance strongly rely on film thickness. The magnetotransport properties have been fitted by a modified parallel connection channel model, which is in(More)