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SUMMARY:Photocurrent detected 2D spectroscopy reveals details of multiple 
 exciton generation in colloidal quantum dots
DTSTART:20141120T163000
DTEND:20141120T173000
DTSTAMP:20260924T165042Z
UID:fe86d5398813fac04a36f1580d3179f7a3de6006efb0551249bfbbf8
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Tõnu Pullerits \nChemical Physics\, Lund University\,
  Sweden\nRecently there has been growing interest in the role of coherence
  in electronic dynamics. Coherent multidimensional spectroscopy (CMS) has 
 been used to reveal coherent phenomena in numerous material systems.  Her
 e we utilize a recent implementation of CMS – two-dimensional photocurre
 nt spectroscopy (2DPS)\, in which we detect the photocurrent from a PbS qu
 antum dot (QD) photocell resulting from its interactions with a sequence o
 f four ultrafast laser pulses. We observe sub-picosecond evolution of 2D s
 pectra consistent with multiple exciton generation. Moreover\, a compariso
 n to 2D fluorescence spectra of the QDs demonstrates the potential of 2DPS
  to elucidate the detailed origin of photocurrent generating electronic st
 ate coherence pathways. Since the measurement is based on detecting the ph
 otocell current in situ\, the method is well suited to study fundamental u
 ltrafast processes that affect the function of the device. This opens new 
 avenues for the investigation and implementation of coherent optimization 
 strategies directly within devices.
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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