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Photoelectric Effect

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...

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Updated: Oct 18, 2025

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

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Published on: March 2, 2021

Selenium-Containing Organic Photovoltaic Materials.

Baobing Fan, Francis Lin, Xin Wu

¹Department of Materials Science & Engineering, Box 352120, University of Washington, Seattle, Washington 98195, United States.

Accounts of Chemical Research

|October 4, 2021

Summary

Selenium-containing organic materials offer enhanced performance in organic photovoltaics (OPVs) by reducing the optical band gap and improving charge carrier mobility. These materials show promise for next-generation solar cells due to their improved efficiency and stability.

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Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices

Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices

Published on: July 8, 2016

Area of Science:

Materials Science
Organic Electronics
Photovoltaics

Background:

Organic photovoltaics (OPVs) are a promising clean energy technology due to their flexibility and solution processability.
Nonfullerene acceptors (NFAs) have significantly improved OPV power conversion efficiency by harvesting near-infrared (NIR) sunlight.
Reducing the optical band gap of NFAs is crucial for further enhancing OPV performance.

Purpose of the Study:

To explore the potential of selenium-containing materials for improving organic photovoltaics (OPVs).
To elucidate the structure-property relationships of selenium-substituted organic conjugated materials.
To summarize design rules and discuss applications of selenium-containing materials in OPVs.

Main Methods:

Comparison of chalcogen heterocycles and their electronic behavior.
Analysis of selenium's influence on optical band gap, charge carrier mobility, and molecular packing.
Correlation of material properties with OPV device performance, stability, and morphology.

Main Results:

Selenium incorporation narrows the optical band gap and enhances quinoidal resonance character.
Increased selenium polarizability leads to enhanced intermolecular Se-Se interactions and charge carrier mobility.
Selenium-containing materials demonstrate intrinsic stability and potential for semitransparent and tandem solar cells.

Conclusions:

Selenium-containing materials are highly effective for enhancing OPV performance, particularly in nonfullerene acceptors.
These materials offer a pathway to further improve short-circuit current density and overall device efficiency.
Further research into selenium-based organic semiconductors holds significant promise for the future of OPV technology.