Tuning open-circuit voltage in organic solar cells by magnesium modified Alq3

Chi Ta Chou; Chien Hung Lin; Meng Hsiu Wu; Tzu Wei Cheng; Jiun Haw Lee; Chin Hsin J. Liu; Yian Tai; Surojit Chattopadhyay; Juen Kai Wang; Kuei Hsien Chen; Li Chyong Chen

doi:10.1063/1.3653259

Tuning open-circuit voltage in organic solar cells by magnesium modified Alq₃

Chi Ta Chou, Chien Hung Lin, Meng Hsiu Wu, Tzu Wei Cheng, Jiun Haw Lee, Chin Hsin J. Liu, Yian Tai, Surojit Chattopadhyay^*, Juen Kai Wang, Kuei Hsien Chen, Li Chyong Chen

^*Corresponding author for this work

Institute of Biophotonics

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

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Abstract

The low molecular weight tris-(8-hydroxyquinoline) aluminum (Alq ₃) has been incorporated with magnesium (Mg) that altered the nature of its opto-electronic characteristics. The lowering of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) in Mg:Alq₃, compared to pure Alq₃, creates a stronger field (exceeding the exciton binding energy) at the donor-acceptor junction to dissociate the photo-generated exciton and also provides a low barrier for electron transport across the device. In an electron-only device (described in the text), a current enhancement in excess of 10³⁺, with respect to pure Alq₃, could be observed at 10 V applied bias. Optimized Mg:Alq₃ layer, when introduced in the photovoltaic device, improves the power conversion efficiencies significantly to 0.15 compared to the pure Alq₃ device. The improvement in the photovoltaic performance has been attributed to the superior exciton dissociation and carrier transport.

Original language	English
Article number	083104
Journal	Journal of Applied Physics
Volume	110
Issue number	8
DOIs	https://doi.org/10.1063/1.3653259
State	Published - 15 Oct 2011

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title = "Tuning open-circuit voltage in organic solar cells by magnesium modified Alq3",

abstract = "The low molecular weight tris-(8-hydroxyquinoline) aluminum (Alq 3) has been incorporated with magnesium (Mg) that altered the nature of its opto-electronic characteristics. The lowering of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) in Mg:Alq3, compared to pure Alq3, creates a stronger field (exceeding the exciton binding energy) at the donor-acceptor junction to dissociate the photo-generated exciton and also provides a low barrier for electron transport across the device. In an electron-only device (described in the text), a current enhancement in excess of 103+, with respect to pure Alq3, could be observed at 10 V applied bias. Optimized Mg:Alq3 layer, when introduced in the photovoltaic device, improves the power conversion efficiencies significantly to 0.15 compared to the pure Alq3 device. The improvement in the photovoltaic performance has been attributed to the superior exciton dissociation and carrier transport.",

author = "Chou, {Chi Ta} and Lin, {Chien Hung} and Wu, {Meng Hsiu} and Cheng, {Tzu Wei} and Lee, {Jiun Haw} and Liu, {Chin Hsin J.} and Yian Tai and Surojit Chattopadhyay and Wang, {Juen Kai} and Chen, {Kuei Hsien} and Chen, {Li Chyong}",

year = "2011",

month = oct,

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doi = "10.1063/1.3653259",

language = "English",

volume = "110",

journal = "Journal of Applied Physics",

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AU - Chou, Chi Ta

AU - Lin, Chien Hung

AU - Wu, Meng Hsiu

AU - Cheng, Tzu Wei

AU - Lee, Jiun Haw

AU - Liu, Chin Hsin J.

AU - Tai, Yian

AU - Chattopadhyay, Surojit

AU - Wang, Juen Kai

AU - Chen, Kuei Hsien

AU - Chen, Li Chyong

PY - 2011/10/15

Y1 - 2011/10/15

N2 - The low molecular weight tris-(8-hydroxyquinoline) aluminum (Alq 3) has been incorporated with magnesium (Mg) that altered the nature of its opto-electronic characteristics. The lowering of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) in Mg:Alq3, compared to pure Alq3, creates a stronger field (exceeding the exciton binding energy) at the donor-acceptor junction to dissociate the photo-generated exciton and also provides a low barrier for electron transport across the device. In an electron-only device (described in the text), a current enhancement in excess of 103+, with respect to pure Alq3, could be observed at 10 V applied bias. Optimized Mg:Alq3 layer, when introduced in the photovoltaic device, improves the power conversion efficiencies significantly to 0.15 compared to the pure Alq3 device. The improvement in the photovoltaic performance has been attributed to the superior exciton dissociation and carrier transport.

AB - The low molecular weight tris-(8-hydroxyquinoline) aluminum (Alq 3) has been incorporated with magnesium (Mg) that altered the nature of its opto-electronic characteristics. The lowering of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) in Mg:Alq3, compared to pure Alq3, creates a stronger field (exceeding the exciton binding energy) at the donor-acceptor junction to dissociate the photo-generated exciton and also provides a low barrier for electron transport across the device. In an electron-only device (described in the text), a current enhancement in excess of 103+, with respect to pure Alq3, could be observed at 10 V applied bias. Optimized Mg:Alq3 layer, when introduced in the photovoltaic device, improves the power conversion efficiencies significantly to 0.15 compared to the pure Alq3 device. The improvement in the photovoltaic performance has been attributed to the superior exciton dissociation and carrier transport.

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DO - 10.1063/1.3653259

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SN - 0021-8979

VL - 110

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 8

M1 - 083104

ER -

Tuning open-circuit voltage in organic solar cells by magnesium modified Alq₃

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