Limits of open circuit voltage in organic photovoltaic devices

M. F. Lo; T. W. Ng; T. Z. Liu; V. A.L. Roy; S. L. Lai; M. K. Fung; C. S. Lee; S. T. Lee

doi:10.1063/1.3360336

Limits of open circuit voltage in organic photovoltaic devices

M. F. Lo, T. W. Ng, T. Z. Liu, V. A.L. Roy, S. L. Lai, M. K. Fung, C. S. Lee, S. T. Lee

Research output: Contribution to journal › Article › peer-review

77 Citations (Scopus)

Abstract

Open circuit voltage (Voc) of organic photovoltaic devices has been interpreted with either the metal-insulator-metal (MIM) model or the energy offset between highest occupied molecular orbital (HOMO) of the donor and the lowest unoccupied molecular orbital (LUMO) of the acceptor (HOMOD -LUMOA). To elucidate the relation between Voc and the two models, we have used electrodes of a wide range of work functions to connect the CuPc/C60 organic photovoltaic devices. We found that when the work function difference (Δ φelectrodes) between ITO and Al electrode is in the range -3 and 0 eV, Voc increases linearly with Δ φelectrodes as prescribed by the MIM model. Outside this range, Voc saturates with values close to that given by the HOMOD -LUMOA less the exciton binding energy.

Original language	English
Article number	113303
Journal	Applied Physics Letters
Volume	96
Issue number	11
DOIs	https://doi.org/10.1063/1.3360336
Publication status	Published - 2010
Externally published	Yes

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title = "Limits of open circuit voltage in organic photovoltaic devices",

abstract = "Open circuit voltage (Voc) of organic photovoltaic devices has been interpreted with either the metal-insulator-metal (MIM) model or the energy offset between highest occupied molecular orbital (HOMO) of the donor and the lowest unoccupied molecular orbital (LUMO) of the acceptor (HOMOD -LUMOA). To elucidate the relation between Voc and the two models, we have used electrodes of a wide range of work functions to connect the CuPc/C60 organic photovoltaic devices. We found that when the work function difference (Δ φelectrodes) between ITO and Al electrode is in the range -3 and 0 eV, Voc increases linearly with Δ φelectrodes as prescribed by the MIM model. Outside this range, Voc saturates with values close to that given by the HOMOD -LUMOA less the exciton binding energy.",

author = "Lo, {M. F.} and Ng, {T. W.} and Liu, {T. Z.} and Roy, {V. A.L.} and Lai, {S. L.} and Fung, {M. K.} and Lee, {C. S.} and Lee, {S. T.}",

note = "Funding Information: This project was supported by the Research Grant Council of Hong Kong (Grant No. CityU 101707). ",

year = "2010",

doi = "10.1063/1.3360336",

language = "English",

volume = "96",

number = "11",

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TY - JOUR

T1 - Limits of open circuit voltage in organic photovoltaic devices

AU - Lo, M. F.

AU - Ng, T. W.

AU - Liu, T. Z.

AU - Roy, V. A.L.

AU - Lai, S. L.

AU - Fung, M. K.

AU - Lee, C. S.

AU - Lee, S. T.

N1 - Funding Information: This project was supported by the Research Grant Council of Hong Kong (Grant No. CityU 101707).

PY - 2010

Y1 - 2010

N2 - Open circuit voltage (Voc) of organic photovoltaic devices has been interpreted with either the metal-insulator-metal (MIM) model or the energy offset between highest occupied molecular orbital (HOMO) of the donor and the lowest unoccupied molecular orbital (LUMO) of the acceptor (HOMOD -LUMOA). To elucidate the relation between Voc and the two models, we have used electrodes of a wide range of work functions to connect the CuPc/C60 organic photovoltaic devices. We found that when the work function difference (Δ φelectrodes) between ITO and Al electrode is in the range -3 and 0 eV, Voc increases linearly with Δ φelectrodes as prescribed by the MIM model. Outside this range, Voc saturates with values close to that given by the HOMOD -LUMOA less the exciton binding energy.

AB - Open circuit voltage (Voc) of organic photovoltaic devices has been interpreted with either the metal-insulator-metal (MIM) model or the energy offset between highest occupied molecular orbital (HOMO) of the donor and the lowest unoccupied molecular orbital (LUMO) of the acceptor (HOMOD -LUMOA). To elucidate the relation between Voc and the two models, we have used electrodes of a wide range of work functions to connect the CuPc/C60 organic photovoltaic devices. We found that when the work function difference (Δ φelectrodes) between ITO and Al electrode is in the range -3 and 0 eV, Voc increases linearly with Δ φelectrodes as prescribed by the MIM model. Outside this range, Voc saturates with values close to that given by the HOMOD -LUMOA less the exciton binding energy.

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DO - 10.1063/1.3360336

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SN - 0003-6951

VL - 96

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 11

M1 - 113303

ER -

Limits of open circuit voltage in organic photovoltaic devices

Abstract

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