Publications by authors named "Norio Terada"
In this study, we investigated band alignments at CdS/epitaxial CuInGaSe (epi-CIGSe) and epi-CIGSe/GaAs heterointerfaces for solar cell applications using ultraviolet, inverse, and X-ray photoemission spectroscopy (UPS, IPES, and XPS) techniques. We clarified the impacts of KF postdeposition treatment (KF-PDT) at the CdS/epi-CIGSe front heterointerfaces. We found that KF-PDT changed the conduction band alignment at the CdS/epi-CIGSe heterointerface from a cliff to flat configuration, attributed to an increase in the electron affinity () and ionization potential () of the epi-CIGSe surface because of a decrease in Cu and Ga contents.
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- Chalcopyrite CuInSe (CISe)-based thin-film solar cells have gained attention since the 1970s, with established technology now leading to commercial products.
- Despite advancements, there are still many unexplored aspects of the materials science and defect physics in CISe-based films and devices that need further research.
- The paper reviews critical issues in CISe materials and devices, including Cu-deficient phases, alkali-metal effects, flexible solar minimodules, and open circuit voltage loss analysis.
The surface electronic properties of the light absorber and band alignment at the p/n heterointerface are key issues for high-performance heterojunction solar cells. We investigated the band alignment of the heterointerface between cadmium sulfide (CdS) and Ge-incorporated CuZnSnSe (CZTGSe), with Ge/(Ge + Sn) ratios ( x) between 0 and 0.4, by X-ray photoelectron, ultraviolet, and inversed photoemission spectroscopies (XPS, UPS, and IPES, respectively).
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