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

Yu Chan Tai, Wen Yen Tzeng, Jhen Dong Lin, Yi Hou Kuo, Fu Xiang Rikudo Chen, Ruei Jhe Tu, Ming Yang Huang, Shyh Shii Pai, Nick Weihan Chang, Sheng Yang Tseng, Chi Chen, Chun Liang Lin*, Atsushi Yabushita, Shun Jen Cheng*, Chih Wei Luo*

*此作品的通信作者

研究成果: Article同行評審

摘要

The energy transfer (ET) between organic molecules and semiconductors is a crucial mechanism for enhancing the performance of semiconductor-based optoelectronic devices, but it remains undiscovered. Here, ultrafast optical pump-probe spectroscopy was utilized to directly reveal the ET between organic Alq3 molecules and Si semiconductors. Ultrathin SiO2 dielectric layers with a thickness of 3.2-10.8 nm were inserted between Alq3 and Si to prevent charge transfer. By means of the ET from Alq3 to Si, the SiO2 thickness-dependent relaxation dynamics of photoexcited carriers in Si have been unambiguously observed on the transient reflectivity change (ΔR/R) spectra, especially for the relaxation process on a time scale of 200-350 ps. In addition, these findings also agree with the results of our calculation in a model of long-range dipole-dipole interactions, which provides critical information for developing future optoelectronic devices.

原文English
頁(從 - 到)10490-10497
頁數8
期刊Nano letters
23
發行號22
DOIs
出版狀態Published - 22 11月 2023

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