Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Nano letters, 2023-11, Vol.23 (22), p.10490-10497

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.