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SUMMARY:Two-Dimensional Colloidal Quantum Wells for Future Photonic Source
 s
DTSTART:20191031T160000
DTEND:20191031T170000
DTSTAMP:20260407T034014Z
UID:16f6029376c3d1ecd9ac5fbcc6a2178409ed83a964278bd8372388b3
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Chih-Jen SHIH\nDepartment of Chemistry and Applied Biosc
 iences\nETH Zurich\nChE-606 - Highlights in Energy Research seminar series
 \nMiniaturized photonic sources based on semiconducting two-dimensional (2
 D) materials offer new technological opportunities beyond the modern III-V
  platforms. For example\, the quantum-confined 2D electronic structure ali
 gns the exciton transition dipole moment\, directing emission perpendicula
 r to the surface which gives rise to high-efficiency quantum optics and el
 ectroluminescent devices. It requires scalable materials and processes to 
 create the decoupled multi-quantum-well (MQW) superlattices\, in which ind
 ividual 2D material layers are isolated by atomically thin quantum barrier
 s (QBs). My research group developed synthetic routes to obtain monodisper
 sed\, quantum-confined colloidal quantum wells (CQWs) of lead halide perov
 skites with precise thickness control\, yielding different emission colors
  without altering the chemical composition. We successfully developed the 
 protocols fabricating the thin-film MQW superlattices out of these materia
 ls. Unexpectedly\, an enhancement of PLQY with respect to colloidal disper
 sions was observed\, and individual QWs can be decoupled with unprecedente
 dly ultrathin QBs that screen interlayer interactions within the range of 
 6.5 Å. These unique phenomena were investigated in order to uncover the u
 nderlying physical mechanisms. The photonic sources demonstrated here have
  narrowband emission together with high quantum yield\, directionality\, a
 nd wavelength tunability\, which are highly desirable for many near-field 
 and far-field applications such as nanoantennas and light-emitting diodes.
 \n\nThe seminar can also be followed remotely by joining the online Cisco 
 WebEx meeting (connection possible 15 minutes before the talk).\nSee here 
 the documentation how to install the Cisco WebEx add-on on your computer.\
 nIn case of problem\, you can contact our IT support (37679 - it.vs@epfl.c
 h)\n 
LOCATION:Tseuzier\, I17 4 K2 https://plan.epfl.ch/?room==I17%204%20K2
STATUS:CONFIRMED
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