Abstract
PbSe nanocrystal quantum dots (NQDs) are a promising active material for a range of optoelectronic devices, including solar cells, high-sensitivity infrared (IR) photodetectors, and IR-emitting diodes and lasers. However, device realization has been constrained by these NQDs chemical instability toward oxidation, which leads to uncontrollable changes in optical and electronic properties. Here, we present a simple method to enhance the stability of PbSe NQDs against oxidation and to improve their optical properties through reaction with molecular chlorine. The chlorine molecules preferentially etch out surface Se ions and react with Pb ions to form a thin (1-2 monolayers) PbClx passivation layer which effectively prevents oxidation during long-term air exposure while passivating surface trap states to increase photoluminescence efficiency and decrease photocharging. Our method is simple, widely applicable to PbSe and PbS NQDs of a range of sizes, compatible with solution-based processes for fabricating NQD-based devices, and effective both in solution and in solid NQD films; thus, it is a practical protocol for facilitating advances over the full range of optoelectronic applications.
| Original language | English |
|---|---|
| Pages (from-to) | 20160-20168 |
| Number of pages | 9 |
| Journal | Journal of the American Chemical Society |
| Volume | 134 |
| Issue number | 49 |
| DOIs | |
| Publication status | Published - Dec 12 2012 |
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ASJC Scopus subject areas
- Chemistry(all)
- Catalysis
- Biochemistry
- Colloid and Surface Chemistry
Cite this
Highly effective surface passivation of pbse quantum dots through reaction with molecular chlorine. / Bae, Wan Ki; Joo, Jin; Padilha, Lazaro A.; Won, Jonghan; Lee, Doh C.; Lin, Qianglu; Koh, Weon Kyu; Luo, Hongmei; Klimov, Victor I; Pietryga, Jeffrey M.
In: Journal of the American Chemical Society, Vol. 134, No. 49, 12.12.2012, p. 20160-20168.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Highly effective surface passivation of pbse quantum dots through reaction with molecular chlorine
AU - Bae, Wan Ki
AU - Joo, Jin
AU - Padilha, Lazaro A.
AU - Won, Jonghan
AU - Lee, Doh C.
AU - Lin, Qianglu
AU - Koh, Weon Kyu
AU - Luo, Hongmei
AU - Klimov, Victor I
AU - Pietryga, Jeffrey M.
PY - 2012/12/12
Y1 - 2012/12/12
N2 - PbSe nanocrystal quantum dots (NQDs) are a promising active material for a range of optoelectronic devices, including solar cells, high-sensitivity infrared (IR) photodetectors, and IR-emitting diodes and lasers. However, device realization has been constrained by these NQDs chemical instability toward oxidation, which leads to uncontrollable changes in optical and electronic properties. Here, we present a simple method to enhance the stability of PbSe NQDs against oxidation and to improve their optical properties through reaction with molecular chlorine. The chlorine molecules preferentially etch out surface Se ions and react with Pb ions to form a thin (1-2 monolayers) PbClx passivation layer which effectively prevents oxidation during long-term air exposure while passivating surface trap states to increase photoluminescence efficiency and decrease photocharging. Our method is simple, widely applicable to PbSe and PbS NQDs of a range of sizes, compatible with solution-based processes for fabricating NQD-based devices, and effective both in solution and in solid NQD films; thus, it is a practical protocol for facilitating advances over the full range of optoelectronic applications.
AB - PbSe nanocrystal quantum dots (NQDs) are a promising active material for a range of optoelectronic devices, including solar cells, high-sensitivity infrared (IR) photodetectors, and IR-emitting diodes and lasers. However, device realization has been constrained by these NQDs chemical instability toward oxidation, which leads to uncontrollable changes in optical and electronic properties. Here, we present a simple method to enhance the stability of PbSe NQDs against oxidation and to improve their optical properties through reaction with molecular chlorine. The chlorine molecules preferentially etch out surface Se ions and react with Pb ions to form a thin (1-2 monolayers) PbClx passivation layer which effectively prevents oxidation during long-term air exposure while passivating surface trap states to increase photoluminescence efficiency and decrease photocharging. Our method is simple, widely applicable to PbSe and PbS NQDs of a range of sizes, compatible with solution-based processes for fabricating NQD-based devices, and effective both in solution and in solid NQD films; thus, it is a practical protocol for facilitating advances over the full range of optoelectronic applications.
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UR - http://www.scopus.com/inward/citedby.url?scp=84870922601&partnerID=8YFLogxK
U2 - 10.1021/ja309783v
DO - 10.1021/ja309783v
M3 - Article
C2 - 23131125
AN - SCOPUS:84870922601
VL - 134
SP - 20160
EP - 20168
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 49
ER -