Year: 2024
Type: article
Abstract: Evidence from cross-sectional electron microscopy has previously shown that Se passivates defects in CdSexTe1−x solar cells, and that this is the reason for better lifetimes and voltages in these devices. Here, we utilise spatially resolved photoluminescence measurements of CdSexTe1−x thin films on glass to directly study the effects of Se on carrier recombination in the material, isolated from the impact of conductive interfaces and without the need to prepare cross-sections through the samples. We find further evidence to support Se passivation of grain boundaries, but also identify an increase in below-bandgap photoluminescence that indicates the presence of Se-enhanced defects in grain interiors. Our results show that whilst Se treatment, in tandem with Cl passivation, does increase radiative efficiencies in CdSexTe1−x, it simultaneously increases the defect content within the grain interiors. This suggests that although it is beneficial overall, Se incorporation will still limit the maximum attainable optoelectronic properties of CdSexTe1−x thin films.
Source: Nature Communications
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,790
Awards: EPSRC Centre for Doctoral Training in New and Sustainable PV, Capacitance spectroscopy led process innovations to improve VOC in CdTe thin film solar cells, G1685559037, G367224153, G3962959331, G4298533165, G485744795, G5089167665, G5259143210, G5378760933, Bandgap engineering for optimal antimony chalcogenide solar cells, Nanophotonic Control of Charge- and Ion-transport for Advancing Light-energy Storage Devices, G7430207777, Plasmon Enhanced Visualization of Buried Interfaces in Solar Cells, The Origin of Non-Radiative Losses in Metal Halide Perovskites, G8566118833
OpenAlex ID: W4403276875