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We have used a lift-off technique and X-ray photoelectron spectroscopy to probe initially buried interfaces of a CdTe solar cell after CdCl2 and contact treatments. We find that the cleavage takes place at or near the CdTe/CdS interface. On both surfaces, Cl is present, most likely due to diffusion through the CdTe layer during the high-temperature CdCl2 activation step. Te is present on both cleavage-exposed...
Photoluminescence (PL) in CdTe in the range from 0.7 eV to 1.5 eV provides a great deal of information about shallow and deep defects and the role of CdCl2 activation treatments in changing the density of these defects. We have used an InGaAs diode-array detector to study this region at 10 K in as-sputtered films and CdCl2-treated films. In the region from 0.7 to 1.2 eV we find a series of peaks from...
We demonstrate holographic assembly of CdSe quantum dots in photopolymer films for fabricating 1D photonic lattice structures with diffraction efficiency near 100%. The nonlinear optical properties of the films are also investigated by z-scan techniques.
We have made CdS/CdTe solar cells on polyimides from different sources. These cells were fabricated using sputtered zinc oxide doped with aluminum as the transparent conducting oxide. The CdS and CdTe were also deposited by sputtering. In this paper we report properties of the sputtered AZO and its changes with CdCl2 heat treatments. We have achieved a cell efficiency of 10.5% at air mass 1.5G illumination.
This paper reports recent experimental work on single junction II-VI semiconductor heterostructure solar cells consisting of n-type CdSe and p-type ZnTe grown by molecular beam epitaxy on GaSb substrates. The structural and crystalline properties are characterized using high-resolution X-ray diffraction measurements. The current-voltage measurements reveal expected diode-like rectifying characteristics...
We have studied the stability in air of sputtered CdTe/CdS cells with a focus on the thickness of the CdS layer and the substrate used during cell fabrication. The stability of cell efficiencies under light soak is compared for CdTe cells on both HRT-coated Pilkington TEC 15 glass and standard TEC15 glass for a range of seven different CdS layer thicknesses from 0 to 230 nm. Little difference in stability...
High-efficiency multifunction solar cells are attracting a great deal of attention for both space and terrestrial applications. We proposed the monolithic integration of the II/VI (ZnCdMg)(SeTe) and the III/V (InAlGa)(AsSb) material systems for multijunction solar cells. These material systems have direct bandgap, zinc blende, quaternary alloys, lattice-matched to GaSb substrates that cover the entire...
We report first applications of pump-probe second harmonic generation (SHG) to monitor spin dynamics in nonmagnetic semiconductor heterostructures (GaAs/GaSb and GaAs/GaSb/InAs). We also examine the band offsets of InAs/CdMnSe samples using internal photoemission and second harmonic generation
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