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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20260729T032352Z
LAST-MODIFIED:20141029T133759Z
DTSTART:20141107T170000Z
DTEND:20141107T180000Z
UID:event1306@bu.edu
URL:http://physics.bu.edu/internal/events/show/1306
SUMMARY:Towards Computational Design of the Optoelectronic Properties of Or
	ganic Materials
DESCRIPTION:Featuring Sahar Sharifzadeh\, ECE\, Boston University\nHosted b
	y: Ophelia Tsui\n\nPart of the Biophysics/Condensed Matter Seminar Series.\
	n\nAbstract:\nLow-­‐cost\nearth-­‐abundant\nmaterials\nsuch\nas\norga
	nic\nmolecules\nare\ncurrently\nbeing\npursued\nas\nintegrated\ncomponents\
	nwithin\nnext-­‐generation\noptoelectronics.\nThe\ndesign\nand\noptimiza
	tion\nof\nthese\nmaterials\nrequires\nunderstanding\nof\ntheir\nstructural\
	nfeatures\nand\nspectroscopic\nproperties\nat\nthe\nnanometer\nscale.\nHere
	\,\nI\nwill\npresent\nrecent\ncomputational\nstudies\,\nbased\non\nfirst-­
	‐principles\nmany-­‐body\nperturbation\ntheory\,\naimed\nat\nunderstan
	ding\nthe\nspectroscopic\nproperties\nof\nselect\norganic\nsemiconductors\,
	\nand\nimproving\nthese\nproperties\nfor\nenhanced\nphotovoltaic\nperforman
	ce.\nFor\nboth\ngas-­‐phase\nmolecules\nand\ncondensed-­‐phase\ncryst
	als\,\nour\nquantitative\ncalculations\nagree\nwell\nwith\ntransport\ngaps\
	nextracted\nfrom\nphotoemission\nspectroscopy\nand\nconductance\nmeasuremen
	ts\,\nas\nwell\nas\nwith\nmeasured\noptical\nabsorption\nspectra.\nI\nwill\
	ndemonstrate\nthat\nwhile\nthe\nenergy\nof\nlow-­‐energy\nexcitations\ni
	n\nthe\nsolid-­‐state\ncan\nbe\nunderstood\nthrough\nan\nelectrostatic\n
	model\,\ninter-­‐molecular\ninteractions\nlead\nto\nsignificant\nexcited
	-­‐state\ndelocalization.\nFurthermore\,\nI\nwill\nintroduce\na\ngeneral
	\nanalysis\nof\ntwo-­‐particle\nelectron-­‐\nhole\nwavefunctions\ntha
	t\nelucidates\nthe\nnature\nof\nlow-­‐lying\nsolid-­‐state\nsinglet\n
	and\ntriplet\noptical\nexcitations\n(excitons)\,\nleading\nto\nnew\ninsight
	\ninto\nthe\ncomplexities\nof\nexcitonic\neffects\nwithin\norganic\ncrystal
	s.\nCollectively\,\nthis\nwork\nreveals\nnew\nways\nin\nwhich\nthe\nnature\
	nand\nenergy\nof\nthe\nexciton\ncan\nbe\ncontrolled\nthrough\nsolid-­‐st
	ate\nmorphology\,\nenabling\nthe\ndeliberate\ndesign\nof\nnovel\nfunctional
	\norganic\nmaterials.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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