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Influence of organic salt concentration on the performance of bulk heterojunction organic solar cell

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Abstract

The effect of organic salt on the performance of bulk heterojunction organic solar cell was investigated by varying the concentration of tetrabutylammonium hexafluorophosphate (TBAPF6). Organic solar cells based on TBAPF6-blended poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEHPPV): (6,6)-phenyl-C61 butyric acid methyl ester (PCBM) thin films with aluminium (Al) as cathode have been fabricated on ITO substrates. The MEHPPV:PCBM films with different concentrations of TBAPF6 (10, 20, 30 and 40 wt% with respect to MEHPPV) were deposited onto the ITO by spin coating technique, followed by deposition of Al using electron gun evaporation technique to build the devices. Experimental results showed that the short circuit current density and open circuit voltage improved with increasing of TBAPF6 concentration up to 20 wt% since more dissociated ions accumulated at the photoactive layer-electrode interfaces resulted in higher built in electric field. However, the short circuit current density and open circuit voltage started to decrease at TBAPF6 concentration of 30 wt%, indicating higher charge recombination as a result of agglomeration of TBAPF6.

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Acknowledgments

This work was carried out with the financial support of Malaysian Ministry of Higher Education (MOHE), under UKM-ST-07-FRGS0237-2010 research grant. The first author would like to acknowledge Universiti Kebangsaan Malaysia for the Research University Fellowship.

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Authors and Affiliations

  1. School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia

    Nasehah Syamin Sabri, Chi Chin Yap & Muhammad Yahaya

  2. Institute of Microengineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia

    Muhamad Mat Salleh

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  1. Nasehah Syamin Sabri
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  2. Chi Chin Yap
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  3. Muhammad Yahaya
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  4. Muhamad Mat Salleh
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Correspondence to Chi Chin Yap.

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Sabri, N.S., Yap, C.C., Yahaya, M. et al. Influence of organic salt concentration on the performance of bulk heterojunction organic solar cell. J Mater Sci: Mater Electron 24, 2183–2188 (2013). https://doi.org/10.1007/s10854-013-1077-6

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  • DOI: https://doi.org/10.1007/s10854-013-1077-6

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