Imbalanced charge mobility in oxygen treated polythiophene/fullerene based bulk heterojunction solar cells

Vijila Chellappan; Ging Meng Ng; Mein Jin Tan; Wei-Peng Goh; Furong Zhu

doi:10.1063/1.3279135

Imbalanced charge mobility in oxygen treated polythiophene/fullerene based bulk heterojunction solar cells

Vijila Chellappan^*, Ging Meng Ng, Mein Jin Tan, Wei-Peng Goh, Furong Zhu^*

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Journal article › peer-review

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Abstract

The effect of oxygen induced traps on charge mobility in bulk heterojunction solar cells using poly(3-hexylthiophene) (P3HT):l-(3- methoxycarbonyl)-propyl-l-phenyl-(6, 6) methanofullerene (PCBM) blend have been studied using photoinduced charge extraction by linearly increasing voltage (PhotoCELIV) technique. The solar cells exposed to oxygen exhibit dual PhotoCELIV peaks, whereas the solar cell without oxygen treatment show single PhotoCELIV peak with the charge mobility of the order of 10^-4 cm ²/V s. It is demonstrated that the oxygen treatment imbalance the charge mobility in the P3HT/PCBM photoactive layer, which affects the power conversion efficiency and lifetime of the solar cell. The single PhotoCELIV peak for the device without oxygen treatment indicates that the charge mobility is balanced, that causes the overlapping of electron and hole transients.

Original language	English
Article number	263305
Number of pages	4
Journal	Applied Physics Letters
Volume	95
Issue number	26
Early online date	29 Dec 2009
DOIs	https://doi.org/10.1063/1.3279135
Publication status	Published - Dec 2009

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Physics and Astronomy (miscellaneous)

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title = "Imbalanced charge mobility in oxygen treated polythiophene/fullerene based bulk heterojunction solar cells",

abstract = "The effect of oxygen induced traps on charge mobility in bulk heterojunction solar cells using poly(3-hexylthiophene) (P3HT):l-(3- methoxycarbonyl)-propyl-l-phenyl-(6, 6) methanofullerene (PCBM) blend have been studied using photoinduced charge extraction by linearly increasing voltage (PhotoCELIV) technique. The solar cells exposed to oxygen exhibit dual PhotoCELIV peaks, whereas the solar cell without oxygen treatment show single PhotoCELIV peak with the charge mobility of the order of 10-4 cm 2/V s. It is demonstrated that the oxygen treatment imbalance the charge mobility in the P3HT/PCBM photoactive layer, which affects the power conversion efficiency and lifetime of the solar cell. The single PhotoCELIV peak for the device without oxygen treatment indicates that the charge mobility is balanced, that causes the overlapping of electron and hole transients.",

author = "Vijila Chellappan and Ng, {Ging Meng} and Tan, {Mein Jin} and Wei-Peng Goh and Furong Zhu",

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AU - Chellappan, Vijila

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AU - Goh, Wei-Peng

AU - Zhu, Furong

PY - 2009/12

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AB - The effect of oxygen induced traps on charge mobility in bulk heterojunction solar cells using poly(3-hexylthiophene) (P3HT):l-(3- methoxycarbonyl)-propyl-l-phenyl-(6, 6) methanofullerene (PCBM) blend have been studied using photoinduced charge extraction by linearly increasing voltage (PhotoCELIV) technique. The solar cells exposed to oxygen exhibit dual PhotoCELIV peaks, whereas the solar cell without oxygen treatment show single PhotoCELIV peak with the charge mobility of the order of 10-4 cm 2/V s. It is demonstrated that the oxygen treatment imbalance the charge mobility in the P3HT/PCBM photoactive layer, which affects the power conversion efficiency and lifetime of the solar cell. The single PhotoCELIV peak for the device without oxygen treatment indicates that the charge mobility is balanced, that causes the overlapping of electron and hole transients.

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Imbalanced charge mobility in oxygen treated polythiophene/fullerene based bulk heterojunction solar cells

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