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Using a first-principles method, we investigate the structural and electronic properties of grain boundaries (GBs) in polycrystalline CdTe and the effects of copassivation of elements with far distinct electronegativities. Of the two types of GBs studied in this Letter, we find that the Cd core is less harmful to the carrier transport, but is difficult to(More)
CdTe is one of the most promising materials for thin-film solar cells. However, further improvement of its performance is hindered by its relatively short minority-carrier lifetime. Combining theoretical calculations and experimental measurements, we find that for both intrinsic CdTe and CdTe solar cell devices, longer minority-carrier lifetimes can be(More)
Ongoing research topics in CdS/CdTe photovoltaic (PV) device technology include development of a back contact demonstrating low resistance and stability, while using processes consistent with large-area manufacturing. In efforts toward this goal, we have developed a sequence of dry, high-temperature processes to provide this contact. The process eliminates(More)
NOTICE The submitted manuscript has been offered by an employee of the Midwest Research Institute (MRI), a contractor of the US Government under Contract No. DE-AC36-99GO10337. Accordingly, the US Government and MRI retain a nonexclusive royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for US(More)
Despite potential detrimental effects of Cu impurity inclusion in CdTe thin film solar cells, such as degradation caused by Cu diffusion into CdS, or reduced shunt resistance, most devices include Cu as p-dopant in CdTe and/or part of the back contact material [1-3]. I-V characterization and time resolved photoluminescence (TRPL) data reveal that. depending(More)
We report results from in situ real-time spectroscopic ellipsometry (RT-SE) investigations into the sputter deposition and subsequent annealing behavior of permittivity-engineered transparent conductive oxide (TCO) films. RT-SE reveals information about the growth dynamics and evolution of the films' electro-optical properties during deposition. We(More)
Polycrystalline thin-film CdTe is one of the leading materials used in photovoltaic solar cells. One way to improve device performance and stability is through understanding how various process steps alter defect states in the CdTe layer. Low-temperature photoluminescence (PL) studies show a 1.456-eV PL peak in single-crystal CdTe that is likely due to a Cu(More)
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