Ambient effects on fullerene/copper phthalocyanine photovoltaic interface

T. W. Ng; M. F. Lo; Y. C. Zhou; Z. T. Liu; C. S. Lee; Ohyun Kwon; S. T. Lee

doi:10.1063/1.3118580

Ambient effects on fullerene/copper phthalocyanine photovoltaic interface

T. W. Ng, M. F. Lo, Y. C. Zhou, Z. T. Liu, C. S. Lee, Ohyun Kwon, S. T. Lee

Centre of Super-Diamond and Advanced Films

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

48 Citations (Scopus)

Abstract

Effects of ambient-air exposure on the energy levels at photovoltaic interface of fullerene (C60) /copper phthalocyanine (CuPc) were studied using ultraviolet photoemission spectroscopy. The junction prepared in ultrahigh vacuum showed flat energy levels with little vacuum level offset, while exposure to ambient air at 10^-5 Torr induced p -type doping of C60 with energy levels bend up for 0.27 eV. The energy difference between HOMO _CuPc - LUMO C₆₀, describing the theoretical maximum open-circuit voltage, increased from 0.64 to 0.81 eV. The exposure moved the LUMO C₆₀ away from the Fermi level, leading to reduction in carrier concentration and film conductivity. © 2009 American Institute of Physics.

Original language	English
Article number	193304
Journal	Applied Physics Letters
Volume	94
Issue number	19
DOIs	https://doi.org/10.1063/1.3118580
Publication status	Published - 2009

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title = "Ambient effects on fullerene/copper phthalocyanine photovoltaic interface",

abstract = "Effects of ambient-air exposure on the energy levels at photovoltaic interface of fullerene (C60) /copper phthalocyanine (CuPc) were studied using ultraviolet photoemission spectroscopy. The junction prepared in ultrahigh vacuum showed flat energy levels with little vacuum level offset, while exposure to ambient air at 10-5 Torr induced p -type doping of C60 with energy levels bend up for 0.27 eV. The energy difference between HOMO CuPc - LUMO C60, describing the theoretical maximum open-circuit voltage, increased from 0.64 to 0.81 eV. The exposure moved the LUMO C60 away from the Fermi level, leading to reduction in carrier concentration and film conductivity. {\textcopyright} 2009 American Institute of Physics.",

author = "Ng, {T. W.} and Lo, {M. F.} and Zhou, {Y. C.} and Liu, {Z. T.} and Lee, {C. S.} and Ohyun Kwon and Lee, {S. T.}",

year = "2009",

doi = "10.1063/1.3118580",

language = "English",

volume = "94",

journal = "Applied Physics Letters",

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TY - JOUR

T1 - Ambient effects on fullerene/copper phthalocyanine photovoltaic interface

AU - Ng, T. W.

AU - Lo, M. F.

AU - Zhou, Y. C.

AU - Liu, Z. T.

AU - Lee, C. S.

AU - Kwon, Ohyun

AU - Lee, S. T.

PY - 2009

Y1 - 2009

N2 - Effects of ambient-air exposure on the energy levels at photovoltaic interface of fullerene (C60) /copper phthalocyanine (CuPc) were studied using ultraviolet photoemission spectroscopy. The junction prepared in ultrahigh vacuum showed flat energy levels with little vacuum level offset, while exposure to ambient air at 10-5 Torr induced p -type doping of C60 with energy levels bend up for 0.27 eV. The energy difference between HOMO CuPc - LUMO C60, describing the theoretical maximum open-circuit voltage, increased from 0.64 to 0.81 eV. The exposure moved the LUMO C60 away from the Fermi level, leading to reduction in carrier concentration and film conductivity. © 2009 American Institute of Physics.

AB - Effects of ambient-air exposure on the energy levels at photovoltaic interface of fullerene (C60) /copper phthalocyanine (CuPc) were studied using ultraviolet photoemission spectroscopy. The junction prepared in ultrahigh vacuum showed flat energy levels with little vacuum level offset, while exposure to ambient air at 10-5 Torr induced p -type doping of C60 with energy levels bend up for 0.27 eV. The energy difference between HOMO CuPc - LUMO C60, describing the theoretical maximum open-circuit voltage, increased from 0.64 to 0.81 eV. The exposure moved the LUMO C60 away from the Fermi level, leading to reduction in carrier concentration and film conductivity. © 2009 American Institute of Physics.

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U2 - 10.1063/1.3118580

DO - 10.1063/1.3118580

M3 - RGC 21 - Publication in refereed journal

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 19

M1 - 193304

ER -

Ambient effects on fullerene/copper phthalocyanine photovoltaic interface

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