Fabrication and characterization of multi-layer InAs/InGaAs quantum dot p-i-n GaAs solar cells grown on silicon substrates

Omri, Mohamed; Sayari, A.; Sfaxi, L.

doi:10.1007/s00339-017-1493-1

Cited by 4 publications

(1 citation statement)

References 36 publications

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“…The solid and dotted lines represent the best fits to standard critical-point line shapes, derived from: . The fit is performed simultaneously for the real and imaginary parts of d 2 ε/dω 2 using a least-squares procedure 48 , 49 . If the angle Ф in the phase factor take values, which are integer multiples of π/2, the line shape corresponds to transitions between uncorrelated one-electron bands while noninteger multiples are usually believed to include excitonic effects by allowing a mixture of two CP integer multiple line shapes.…”

Section: Resultsmentioning

confidence: 99%

Observation of resonant exciton and correlated plasmon yielding correlated plexciton in amorphous silicon with various hydrogen content

Prayogi

Asih

Priyanto

et al. 2022

Sci Rep

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Hydrogenated amorphous silicon (a-Si: H) has received great attention for rich fundamental physics and potentially inexpensive solar cells. Here, we observe new resonant excitons and correlated plasmons tunable via hydrogen content in a-Si: H films on Indium Tin Oxide (ITO) substrate. Spectroscopic ellipsometry supported with High Resolution-Transmission Electron Microscopy (HR-TEM) is used to probe optical properties and the density of electronic states in the various crystallinity from nano-size crystals to amorphous a-Si: H films. The observed optical and electronic structures are analyzed by the second derivative with analytic critical-point line shapes. The complex dielectric function shows good agreement with microscopic calculations for the energy shift and the broadening inter-band transitions based on the electron–hole interaction. Interestingly, we observe an unusual spectral weight transfer over a broad energy range revealing electronic correlations that cause a drastic change in the charge carrier density and determine the photovoltaic performance. Furthermore, the interplay of resonant excitons and correlated plasmons is discussed in term of a correlated plexciton. Our result shows the important role of hydrogen in determining the coupling of excitons and plasmons in a-Si: H film for photovoltaic devices.

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