Photochemical electronic doping of colloidal CdSe nanocrystals

被引：0
|
作者：
Rinehart, Jeffrey D. [1 ]
Schimpf, Alina M. [1 ]
Weaver, Amanda L. [1 ]
Cohn, Alicia W. [1 ]
Gamelin, Daniel R. [1 ]
机构：
[1] Rinehart, Jeffrey D.
[2] Schimpf, Alina M.
[3] Weaver, Amanda L.
[4] Cohn, Alicia W.
[5] Gamelin, Daniel R.
来源：
Gamelin, D.R. (gamelin@chem.washington.edu) | 1600年 / American Chemical Society卷 / 135期
关键词：
A method for electronic doping of colloidal CdSe nanocrystals (NCs) is reported. Anaerobic photoexcitation of CdSe NCs in the presence of a borohydride hole quencher; Li[Et3BH; yields colloidal n-type CdSe NCs possessing extra conduction-band electrons compensated by cations deposited by the hydride hole quencher. The photodoped NCs possess excellent optical quality and display the key spectroscopic signatures associated with NC n-doping; including a bleach at the absorption edge; appearance of a new IR absorption band; and Auger quenching of the excitonic photoluminescence. Although stable under anaerobic conditions; these spectroscopic changes are all reversed completely upon exposure of the n-doped NCs to air. Chemical titration of the added electrons confirms previous correlations between absorption bleach and electron accumulation and provides a means of quantifying the extent of electron trapping in some NCs. The generality of this photodoping method is demonstrated by initial results on colloidal CdE (E = S; Te) NCs as well as on CdSe quantum dot films. © 2013 American Chemical Society;
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Journal article (JA)
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页码：18782 / 18785
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