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In this study, the optoelectronic properties of a monolithically integrated series-connected tandem solar cell are simulated. Following the large success of hybrid organic-inorganic perovskites, which have recently demonstrated large efficiencies with low production costs, we examine the possibility of using the same perovskites as absorbers in a tandem solar cell. The cell consists in a methyl ammonium...
In-plane wave propagation in layered piezoelectric phononic crystals composed of functionally graded interlayers arisen from the solid diffusion is considered in the present work. Wave transmission and band-gaps due to the material gradation and incident wave-field are investigated. A classification of band-gaps in layered piezoelectric functionally graded phononic crystals is proposed. The classification...
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...
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...
This paper addresses a fundamental question on the physics of negative bias temperature instability (NBTI). Besides interface states, is oxide trapped charge (i.e., trapped holes) generated concurrently by NBTI stress? The discussion is made against a backdrop of critical questions, evolving from recent studies, which challenge the validity of the charge pumping method used commonly for quantifying...
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