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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
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Electron Lifetime of Over One Month in Disordered Organic Solid-State Films
Takahiko Yamanaka1,2, Hajime Nakanotani2,3, Katsuhiro Nakamoto1
1Central Research Laboratory, Hamamatsu Photonics K.K., 5000 Hirakuchi, Hamakita-ku, Hamamatsu, Shizuoka, 434-8601, Japan.
Advanced Materials (Deerfield Beach, Fla.)
|December 14, 2022
Summary
Organic semiconductors exhibit ultralong intrinsic carrier lifetimes exceeding one month, a significant advancement over the typical nanosecond to millisecond range. This breakthrough promises enhanced performance for organic solar cells and other electronic devices.
Area of Science:
- Materials Science
- Organic Electronics
- Semiconductor Physics
Background:
- Intrinsic carrier lifetime is crucial for organic solar cells (OSCs) and photocatalysts.
- Disordered organic semiconductors typically have short carrier lifetimes (nanoseconds to milliseconds).
- Short lifetimes limit OSC efficiency and photocatalyst performance, hindering applications like organic memory devices.
Purpose of the Study:
- To report an unprecedentedly long intrinsic carrier lifetime in disordered organic semiconductors.
- To investigate the mechanisms behind this ultralong carrier lifetime.
Main Methods:
- Fabrication of disordered organic semiconductor films.
- Storage of films at room temperature without external power.
- Characterization of carrier lifetime using advanced spectroscopic techniques (details not specified in abstract).
Main Results:
- An intrinsic carrier lifetime exceeding one month was achieved at room temperature.
- This lifetime is orders of magnitude longer than previously observed in similar materials.
- The ultralong lifetime is attributed to carrier stabilization mechanisms.
Conclusions:
- Disordered organic semiconductors can possess exceptionally long carrier lifetimes.
- Mechanisms include spontaneous orientation polarization, excited spin-triplet recycling, and recombination blocking.
- This finding opens new avenues for advanced organic electronic and optoelectronic devices.
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