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

Abstract

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.

Peningkatan Performa Sel Surya Dengan Sistem Peredam Panas

“…Jelas dari gambar bahwa peningkatan suhu sel menyebabkan penurunan tegangan dan peningkatan arus [26]. Selain itu, peningkatan radiasi matahari meningkatkan volt dan arus karena peningkatan radiasi matahari yang dating [27]. Hal ini juga menunjukkan bahwa volt keluaran sel surya meningkat dengan menurunnya arus keluaran sel surya.…”

LED lights of various colors for comprehending the photoelectric effects phenomena

“…But when given light with a shorter wavelength (higher frequency [6], towards the purple color of the light spectrum) than before [7], suddenly electrons escape from the metal plate so that an electric current is detected [8], even though the intensity given is smaller than the previous intensity [9]. This means that the energy required by the metal plate to remove electrons depends on the wavelength [10].…”

Enhancement of the Silicon Nanocrystals’ Electronic Structure within a Silicon Carbide Matrix

“…Under the right conditions, silicon and carbon-based radicals can combine to form three-dimensional SiC [13]. They used inductively coupled PECVD to develop SiC thin films produced by a mixture of hydrogen-diluted SiH 4 and CH 4 gas at 200 °C for the substrate [14]. This demonstrates the critical role reactive hydrogen atoms play in encouraging the growth of SiC by lowering the free energy of crystallographic facets and lowering the carbon content by removing surface carbon atoms [15].…”