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Issue 48, 2012
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High-efficiency polymer photovoltaic cells using a solution-processable insulating interfacial nanolayer: the role of the insulating nanolayer

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Abstract

We employed a low-cost solution-processed ultrathin insulating polymeric layer of poly(4-hydroxystyrene) (PHS), with a high glass transition temperature (Tg ∼ 185 °C), as an interfacial layer between the polymer:fullerene photoactive layer and the Al negative electrode for enhancing device power conversion efficiency (PCE) of polymer bulk-heterojunction photovoltaic cells and investigated the roles of the interfacial nanolayer by ultraviolet photoemission spectroscopy and capacitance–voltage measurement. The thin polymeric layer forms a dipole layer and causes the vacuum level of the adjacent negative electrode to shift upward, which resulted in an increase of the built-in potential. As a result, the open-circuit voltage and PCE of the device using a PHS nanolayer were remarkably improved. We finally achieved a very high PCE of 6.5% with the PHS/Al negative electrode which is even much better than that of the device using an Al electrode (5.0%). The solution-processed inexpensive PHS layer with a high Tg can be an attractive alternative to conventional vacuum-deposited low-work-function metal and insulating metal fluoride interfacial layers.

Graphical abstract: High-efficiency polymer photovoltaic cells using a solution-processable insulating interfacial nanolayer: the role of the insulating nanolayer

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Publication details

The article was received on 27 Jul 2012, accepted on 01 Oct 2012 and first published on 01 Oct 2012


Article type: Paper
DOI: 10.1039/C2JM35016E
J. Mater. Chem., 2012,22, 25148-25153

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    High-efficiency polymer photovoltaic cells using a solution-processable insulating interfacial nanolayer: the role of the insulating nanolayer

    K. Lim, M. Choi, H. Kim, J. H. Park and T. Lee, J. Mater. Chem., 2012, 22, 25148
    DOI: 10.1039/C2JM35016E

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