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Related Concept Videos

Photosystem I01:27

Photosystem I

Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Photosystem II01:22

Photosystem II

The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment molecules...
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.

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Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
13:09

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Published on: January 6, 2016

Diamond-based molecular platform for photoelectrochemistry.

Yu Lin Zhong1, Anupam Midya, Zhaoyue Ng

  • 1Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543.

Journal of the American Chemical Society
|December 4, 2008
PubMed
Summary

Boron doped diamond (BDD) thin films offer superior photocurrent conversion and photostability over indium tin oxide (ITO) and fluorine-doped tin oxide (FTO). This is due to optimized energy levels and robust carbon-carbon bonding at the organic interface.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Organic Electronics

Background:

  • Transparent conducting oxides like ITO and FTO are standard in organic electronics.
  • These materials often face limitations in stability and energy level matching.
  • Developing alternative transparent conductors is crucial for advancing device performance.

Purpose of the Study:

  • To evaluate Boron doped diamond (BDD) thin films as an alternative transparent conductor.
  • To compare the performance of BDD with ITO and FTO in terms of photocurrent conversion efficiency and photostability.
  • To investigate the interfacial properties influencing device performance.

Main Methods:

  • Fabrication of Boron doped diamond thin films.
  • Characterization of BDD, ITO, and FTO properties.
  • Integration of these materials into organic electronic devices.
  • Measurement of photocurrent conversion efficiencies and photostability under operational conditions.

Main Results:

  • BDD thin films demonstrated higher photocurrent conversion efficiencies compared to ITO and FTO.
  • BDD exhibited enhanced photostability, outperforming conventional transparent conductors.
  • Analysis revealed favorable energy level alignment and strong C-C bonding at the organic/BDD interface.

Conclusions:

  • Boron doped diamond is a promising alternative transparent conductor for organic electronics.
  • The superior performance of BDD is attributed to its electronic properties and robust interface.
  • BDD offers a pathway to more stable and efficient organic electronic devices.