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Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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A Nonfullerene Small Molecule Acceptor with 3D Interlocking Geometry Enabling Efficient Organic Solar Cells.

Jaewon Lee1, Ranbir Singh1, Dong Hun Sin1

  • 1Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 790-784, South Korea.

Advanced Materials (Deerfield Beach, Fla.)
|November 6, 2015
PubMed
Summary

Researchers developed a novel 3D nonfullerene small-molecule acceptor for organic solar cells. This new material improves molecular structure and charge transfer, achieving nearly 6% power conversion efficiency.

Keywords:
3D interlockingnonfullerene acceptorsorganic solar cellsperylene diimides

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Organic solar cells (OSCs) offer potential for low-cost, flexible energy generation.
  • Developing efficient small-molecule acceptors is crucial for advancing OSC performance.
  • Nonfullerene acceptors (NFAs) have shown promise in overcoming limitations of traditional fullerene acceptors.

Purpose of the Study:

  • To introduce a novel 3D nonfullerene small-molecule acceptor with unique structural properties.
  • To investigate the impact of the acceptor's geometry on molecular conformation and intermolecular interactions.
  • To evaluate the performance of organic solar cells utilizing this new acceptor in conjunction with a novel polymer donor.

Main Methods:

  • Synthesis and characterization of a new 3D nonfullerene small-molecule acceptor.
  • Fabrication of solution-processed organic solar cells using the novel acceptor and a polymer donor.
  • Performance evaluation of the organic solar cells, including power conversion efficiency (PCE) measurements.

Main Results:

  • The 3D interlocking geometry resulted in uniform molecular conformation and strong intermolecular connectivity.
  • Favorable nanoscale phase separation and enhanced electron charge transfer were observed.
  • Organic solar cells achieved a high power conversion efficiency of close to 6%.

Conclusions:

  • The developed 3D nonfullerene small-molecule acceptor is a promising candidate for high-performance organic solar cells.
  • The unique molecular design facilitates efficient charge transport and morphology control.
  • This work contributes to the advancement of nonfullerene acceptor materials for next-generation photovoltaics.