Abstract
2D crystals, single sheets of layered materials, often show distinct properties desired for optoelectronic applications, such as larger and direct band gaps, valley- and spin-orbit effects. Being atomically thin, the low amount of material is a bottleneck in photophysical and photochemical applications. Here, the formation of stacks of 2D crystals intercalated with small surfactant molecules is proposed. It is shown, using first principles calculations, that the very short surfactant methyl amine electronically decouples the layers. The indirect–direct band gap transition characteristic for Group 6 transition metal dichalcogenides is demonstrated experimentally by observing the emergence of a strong photoluminescence signal for ethoxide-intercalated WSe2 and MoSe2 multilayered nanoparticles with lateral size of about 10 nm and beyond. The proposed hybrid materials offer the highest possible density of the 2D crystals with electronic properties typical of monolayers. Variation of the surfactant's chemical potential allows fine-tuning of electronic properties and potentially elimination of trap states caused by defects.
| Original language | English |
|---|---|
| Article number | 1803910 |
| Journal | Small |
| Volume | 14 |
| Issue number | 51 |
| DOIs | |
| Publication status | Published - 2018 Dec 20 |
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All Science Journal Classification (ASJC) codes
- Biotechnology
- Biomaterials
- Chemistry(all)
- Materials Science(all)
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2D Crystals in Three Dimensions : Electronic Decoupling of Single-Layered Platelets in Colloidal Nanoparticles. / Kempt, Roman; Kuc, Agnieszka; Han, Jae Hyo; Cheon, Jinwoo; Heine, Thomas.
In: Small, Vol. 14, No. 51, 1803910, 20.12.2018.Research output: Contribution to journal › Article
TY - JOUR
T1 - 2D Crystals in Three Dimensions
T2 - Electronic Decoupling of Single-Layered Platelets in Colloidal Nanoparticles
AU - Kempt, Roman
AU - Kuc, Agnieszka
AU - Han, Jae Hyo
AU - Cheon, Jinwoo
AU - Heine, Thomas
PY - 2018/12/20
Y1 - 2018/12/20
N2 - 2D crystals, single sheets of layered materials, often show distinct properties desired for optoelectronic applications, such as larger and direct band gaps, valley- and spin-orbit effects. Being atomically thin, the low amount of material is a bottleneck in photophysical and photochemical applications. Here, the formation of stacks of 2D crystals intercalated with small surfactant molecules is proposed. It is shown, using first principles calculations, that the very short surfactant methyl amine electronically decouples the layers. The indirect–direct band gap transition characteristic for Group 6 transition metal dichalcogenides is demonstrated experimentally by observing the emergence of a strong photoluminescence signal for ethoxide-intercalated WSe2 and MoSe2 multilayered nanoparticles with lateral size of about 10 nm and beyond. The proposed hybrid materials offer the highest possible density of the 2D crystals with electronic properties typical of monolayers. Variation of the surfactant's chemical potential allows fine-tuning of electronic properties and potentially elimination of trap states caused by defects.
AB - 2D crystals, single sheets of layered materials, often show distinct properties desired for optoelectronic applications, such as larger and direct band gaps, valley- and spin-orbit effects. Being atomically thin, the low amount of material is a bottleneck in photophysical and photochemical applications. Here, the formation of stacks of 2D crystals intercalated with small surfactant molecules is proposed. It is shown, using first principles calculations, that the very short surfactant methyl amine electronically decouples the layers. The indirect–direct band gap transition characteristic for Group 6 transition metal dichalcogenides is demonstrated experimentally by observing the emergence of a strong photoluminescence signal for ethoxide-intercalated WSe2 and MoSe2 multilayered nanoparticles with lateral size of about 10 nm and beyond. The proposed hybrid materials offer the highest possible density of the 2D crystals with electronic properties typical of monolayers. Variation of the surfactant's chemical potential allows fine-tuning of electronic properties and potentially elimination of trap states caused by defects.
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U2 - 10.1002/smll.201803910
DO - 10.1002/smll.201803910
M3 - Article
C2 - 30398000
AN - SCOPUS:85055955064
VL - 14
JO - Small
JF - Small
SN - 1613-6810
IS - 51
M1 - 1803910
ER -