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Related Concept Videos

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
591
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.3K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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RAINBOW Organic Solar Cells: Implementing Spectral Splitting in Lateral Multi-Junction Architectures.

Martí Gibert-Roca1, Miquel Casademont-Viñas1, Quan Liu2

  • 1Dept. of Nanostructured Materials, Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), E-08193, Cerdanyola del Vallès, Spain.

Advanced Materials (Deerfield Beach, Fla.)
|March 21, 2023
PubMed
Summary

This study introduces the RAINBOW solar cell concept, using side-by-side semiconductor junctions to split light spectra. This approach significantly boosts organic solar cell efficiency by reducing energy loss and improving light harvesting.

Keywords:
RAINBOW solar cellsmulti‐junction geometriesnonfullerene blendsorganic photovoltaicsspectral splittingtandem devices

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Organic Electronics

Background:

  • Multi-junction organic solar cells offer theoretical efficiency gains, but practical improvements remain limited.
  • Existing designs struggle to optimize light absorption across the solar spectrum for individual semiconductor layers.

Purpose of the Study:

  • To introduce and validate the RAINBOW (Resonant Absorption Integrated Optoelectronic Waveguide) concept for organic solar cells.
  • To explore a novel spectral splitting device architecture using laterally arranged sub-cells with cascading bandgaps.
  • To demonstrate the potential for reduced thermalization losses and enhanced light harvesting in organic photovoltaics.

Main Methods:

  • Device simulations were employed to determine critical material and design parameters for RAINBOW sub-cells.
  • Three semiconductor systems with narrow, medium, and wide effective bandgaps were selected for experimental investigation.
  • A custom setup was used to generate spectrally spread sunlight for experimental validation of simulation results.

Main Results:

  • Simulations and experiments confirmed that the RAINBOW geometry reduces thermalization losses and improves light harvesting.
  • A relative efficiency improvement of 46.6% was achieved compared to the best-performing single sub-cell.
  • A monolithic proof-of-concept device with two solution-processed sub-cells was successfully fabricated.

Conclusions:

  • The RAINBOW concept presents a viable strategy for enhancing organic solar cell performance.
  • Lateral spectral splitting offers a promising alternative to traditional multi-junction designs for improved energy conversion.
  • The fabricated device demonstrates the practical feasibility and significant potential of this innovative solar cell architecture.