VISIT of Moonsub Shim

Department of Chemistry

University of Chicago 

February 7- February 10,2001

VERSION 4.0

Wednesday, February 7

 

Arrive OKC from St. Louis on TWA 0519 at 6:43pm - pickup by Matt Johnson

Thursday, February 8

 

8:00am	Pick Up from Montford Inn, Matt Johnson
8:15am-8:45am	Departmental Tour - Ryan Doezema,Rm. 131
9:00am-9:45am	Dean Lee Williams, VP for Research, Rm. 313, Buchanan Hall
10:00am-10:30am	Laboratory Tour - Michael Santos, Rm. 105
10:30am-11:00am	Laboratory Tour - Eric Abraham, Rm. 125
11:30am-11:30am	Laboratory Tour - Neil Shafer-Ray, Rm. 124
11:30am-12:00pm	High Energy, Rm. 320
12:00pm-1:30pm	LUNCH -Condensed Matter Group
1:30pm-2:00pm	CAS Dean Sankowski, 1100 Physical Sciences Building
2:00pm-3:00pm	Laboratory Tour - John Furneaux (Phys. Science Building,  Rm. 320, x5-0102)
3:00pm-3:30pm	Meet with Grad Students, Rm. 301
3:30pm-4:00pm	Tea, 1st Floor Foyer
4:00 pm-5:00pm	Talk: ?Charges, Charge Separation, and  Charge Transfer in Colloidal Semiconductor Nanocrystals"
5:00 pm-5:30pm	Research Discussion with Chemists
6:00 pm-7:30 pm	Dinner at
7:30pm-9:30pm	Reception at Murphy/Johnson (535 E. Boyd, phone: 447-6870)

Friday, February 9

 

8:00am	Pick Up from Montford Inn,Matt Johnson
8:30am-9:00am	Laboratory Tour - Sheena Murphy, Rm. 101
9:00am-9:30am	Astronomy & Astrophysics, Rm. 320
9:30am-10:30am	Laboratory Tour - Matt Johnson, Rm. 106
10:30am-11:00am	Free Time
11:00am-12:00am	Research discussion with Kieran Mullen and Bruce Mason
12:00am-1:30pm	LUNCH with Committee A
1:30pm-2:30pm	Atomic, Molecular and Chemical, Rm 201
2:30pm-3:30pm	Open Time/ Tour Facilities, Instrument Shop etc.
3:30pm-4:00pm	Tea, 1st Floor Foyer
4:00pm-5:00pm	Research Plan Discussion (Matt, Sheena, Kieran, CMP, Brad, Dan G.) Rm.201
5:00pm-5:30pm	Exit Interview - Ryan Doezema, Rm. 131
6:30 pm-8:00 pm	Dinner at Sushi Neko

Saturday February 10

 

Pick Up from Montford Inn,Matt Johnson.Drop off at airport for 10:55am TWA flight 0216

Trapping Holes and Delocalizing Confined Electrons: Charges, Charge

Separation, and Charge Transfer in Colloidal Semiconductor Nanocrystals

Colloidal semiconductor nanocrystals are unique materials that juxtapose atomic and bulk-like properties while possessing readily accessible surface properties. While much progress has been made especially in control of size dispersion, shape and photoluminescence efficiency, the influence of charges on many properties of semiconductor nanocrystals is beginning to receive increasing attention. Understanding charging effects,inherent and induced charge separation, and charge transfer processes are all important in any future electronic and opto-electronic applications. Large permanent dipole moments have been observed in semiconductor nanocrystals. Chemical modifications can enhance charge separation with electrons delocalized in the quantum confined conduction band states over a millisecond while the holes are localized in trap states. Charge transfer can now extend the lifetimes of the conduction electrons to the static limit. Charge transfer doping has led to the new n-type colloidal nanocrystals. These observations indicate that many of the interesting properties of colloidal semiconductor nanocrystals are not only size-dependent but can also be fine-tuned by controlling the Fermi level and the charge distribution.