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Directly Unveiling the Energy Transfer Dynamics between Alq₃ Molecules and Si by Ultrafast Optical Pump-Probe

Yu-Chan Tai¹, Wen-Yen Tzeng^1,2, Jhen-Dong Lin¹

¹Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan.

|November 1, 2023

Summary

Energy transfer (ET) between organic molecules and silicon semiconductors was directly observed. This discovery, using ultrafast spectroscopy, is key for advancing optoelectronic device performance.

Keywords:

excitonic sensitization nonradiative energy transfer silicon time-resolved spectroscopy

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Area of Science:

Materials Science
Physical Chemistry
Solid State Physics

Background:

Energy transfer (ET) is vital for optoelectronic devices.
The ET mechanism between organic molecules and semiconductors is not fully understood.
Alq3 and silicon (Si) are key materials in optoelectronics.

Purpose of the Study:

To directly reveal and investigate the energy transfer between organic Alq3 molecules and Si semiconductors.
To understand the role of dielectric layers in modulating ET.
To provide insights for future optoelectronic device development.

Main Methods:

Ultrafast optical pump-probe spectroscopy was employed.
Ultrathin silicon dioxide (SiO2) dielectric layers (3.2-10.8 nm) were used to isolate ET from charge transfer.
Transient reflectivity change (ΔR/R) spectra were analyzed.

Main Results:

Direct evidence of energy transfer from Alq3 to Si was observed.
SiO2 layer thickness influenced the relaxation dynamics of photoexcited carriers in Si.
A characteristic relaxation process occurred on a 200-350 ps timescale.
Experimental results aligned with theoretical calculations based on long-range dipole-dipole interactions.

Conclusions:

Energy transfer between organic molecules and semiconductors can be directly observed and quantified.
Dielectric layer engineering is a viable strategy to control ET in hybrid devices.
The findings offer critical data for designing high-performance semiconductor-based optoelectronic devices.