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Low-temperature scanning tunneling microscopy/ultraviolet photoelectron spectroscopy investigation of two-dimensional crystallization of C60: pentacence binary system on Ag(111)
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10.1063/1.3679573
/content/aip/journal/jap/111/3/10.1063/1.3679573
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/3/10.1063/1.3679573
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Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) Molecular structures of pentacene and C60; (b) schematic model for the packing structure of the “brick-wall” pentacene superstructure on Ag(111); (c) large scale STM image (50 × 50 nm2, VT = −0.9V) of the “brick-wall” pentacene superstructure on Ag(111); and (d) the corresponding molecularly-resolved STM image (7 × 7 nm2, VT = −0.9V); (e) STM image (20 × 20 nm2, VT = −1.5V) and (f) the corresponding proposed model of 2 D C60 nanocavity network after the room temperature deposition of 0.7 ML C60 onto the pentacene covered Ag(111) and followed by subsequent annealing at 360 K.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Large scale STM image (100 × 100 nm2, VT = −2.1V) for C60: pentacene binary system after annealing at 370 K for 80 min, the observed two different domains (1 and 2) are highlighted; (b) close up STM image (10 × 10 nm2, VT = −2.1V) and (c) the corresponding proposed model of 2 D C60 pair network in domain 1; (d) close up STM image (10 × 10 nm2, VT = −2.0V) and (e) the corresponding proposed model of the C60 pentamer arrays in domain 2; (f) STM image (60 × 100 nm2, VT = −2.1V) of the C60: pentacene binary system after annealing at 410 K for 30 min.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Large scale STM image (100 × 100 nm2, VT = −2.0V) for C60: pentacene binary system after annealing at 410 K for 30min; (b) the corresponding close up STM image (20 × 20 nm2, VT = −2.0V) shows the insertion of C60 pairs between C60 pentamers; (c) STM image (20 × 20 nm2, VT = −2.0V); and (d) the corresponding model of a locally ordered herringbone C60 pair structure.

Image of FIG. 4.
FIG. 4.

(Color online) (a) Large scale STM image (100 × 100 nm2, VT = −2.3V) of the C60 on monolayer pentacene covered HOPG; and (b) the corresponding close up STM image (10 × 10 nm2,VT = 2.3V) of the locally ordered herringbone C60 pair structure.

Image of FIG. 5.
FIG. 5.

(Color online) Evolution of UPS spectra at (a) low kinetic energy region, (b) and (c) low binding energy region near the Fermi level during the sequential deposition of C60 on 3 nm pentacene covered HOPG. All binding energies are referred to the substrate Fermi level.

Image of FIG. 6.
FIG. 6.

(Color online) Schematic diagram of the energy level alignment at the C60/pentacene heterojunction interface.

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/content/aip/journal/jap/111/3/10.1063/1.3679573
2012-02-02
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Low-temperature scanning tunneling microscopy/ultraviolet photoelectron spectroscopy investigation of two-dimensional crystallization of C60: pentacence binary system on Ag(111)
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/3/10.1063/1.3679573
10.1063/1.3679573
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