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The Antenna Complex01:15

The Antenna Complex

Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
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The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
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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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Aromatic Hydrocarbon Cations: Structural Overview01:18

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.

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A supramolecular complex in small-molecule solar cells based on contorted aromatic molecules.

Seok Ju Kang1, Jong Bok Kim, Chien-Yang Chiu

  • 1Department of Chemistry, Columbia University, New York, NY 10027, USA.

Angewandte Chemie (International Ed. in English)
|July 19, 2012
PubMed
Summary

Researchers developed a novel organic solar cell using a contorted dibenzotetrathienocoronene (6-DBTTC) and C(70) fullerene (PC(70) BM). Optimal power conversion efficiency was achieved at a 1:2 molar ratio, enhancing charge separation.

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Published on: March 2, 2021

Area of Science:

  • Materials Science
  • Organic Electronics
  • Supramolecular Chemistry

Background:

  • Organic solar cells (OSCs) offer a promising alternative to conventional photovoltaics due to their flexibility and low-cost processing.
  • Fullerene derivatives like PC(70) BM are common electron acceptors in OSCs, but their performance can be limited by morphology and charge transport.
  • Novel organic semiconductors are needed to improve the efficiency and stability of OSCs.

Purpose of the Study:

  • To investigate the formation and properties of a supramolecular complex between a contorted dibenzotetrathienocoronene (6-DBTTC) and a C(70) fullerene (PC(70) BM).
  • To evaluate the performance of organic solar cells fabricated using this 6-DBTTC:PC(70) BM system.
  • To understand the relationship between the supramolecular complex formation and the charge separation dynamics in the active layer.

Main Methods:

  • Solution processing of 6-DBTTC and PC(70) BM to form thin films for organic solar cells.
  • Fabrication and characterization of organic solar cell devices.
  • Analysis of the active layer morphology and the impact of the 6-DBTTC:PC(70) BM molar ratio on device performance.
  • Investigation of charge separation mechanisms within the supramolecular complex.

Main Results:

  • A unique "ball and socket" supramolecular complex was formed between 6-DBTTC and PC(70) BM, embedded within an amorphous PC(70) BM phase.
  • The organic solar cells processed from this system exhibited good performance.
  • Maximum power conversion efficiency was achieved at a specific 1:2 molar ratio of 6-DBTTC to PC(70) BM.
  • The formation of the supramolecular complex was found to directly influence the charge separation efficiency in the active layer.

Conclusions:

  • The "ball and socket" motif in the 6-DBTTC:PC(70) BM complex is crucial for efficient charge separation in organic solar cells.
  • Solution-processable contorted dibenzotetrathienocoronene and C(70) fullerene offer a viable system for developing high-performance organic solar cells.
  • Precise control over the molar ratio is essential for optimizing device efficiency, highlighting the importance of supramolecular self-assembly in organic electronics.