Modified buffer layers for polymer photovoltaic devices

The influence of anode buffer layers on the performance of polymer photovoltaic devices based on blends of poly3-hexylthiophene and 6,6-phenyl-C-61-buytyric acid methyl ester has been investigated. The buffer layers consist of poly3,4-ethylenedioxythiophene:polystyrenesulfonate PEDOT-PSS doped with different concentrations of mannitol. Improved power conversion efficiency, up to 5.2%, has been observed by reducing the resistance of PEDOT:PSS after doping. One extrapolation method has been developed to exclude the resistance from the connection of the electrodes from the total device resistance. The results confirm that the device improvement is due to the reduction of series resistance of the PEDOT:PSS after the mannitol doping. © 2007 American Institute of Physics. DOI: 10.1063/1.2437703 Organic photovoltaic devices PVs have attracted considerable attention due to their potential for flexible, lightweight, and low-cost applications of solar energy conversion. Recently, the power conversion efficiency PCE of photovoltaic cells around 5% has been realized. 1,2 In addition, through the optimization of the donor/acceptor energy levels, the efficiency up to 10% is expected from recent simulation

[1]  Xiong Gong,et al.  Thermally Stable, Efficient Polymer Solar Cells with Nanoscale Control of the Interpenetrating Network Morphology , 2005 .

[2]  Jean-Michel Nunzi,et al.  Organic photovoltaic materials and devices , 2002 .

[3]  U. Steiner,et al.  Hierarchical Pattern Formation in Thin Polymer Films Using an Electric Field and Vapor Sorption , 2005 .

[4]  O. Inganäs,et al.  Influence of buffer layers on the performance of polymer solar cells , 2004 .

[5]  André Moliton,et al.  How to model the behaviour of organic photovoltaic cells , 2006 .

[6]  Alan J. Heeger,et al.  DUAL-FUNCTION SEMICONDUCTING POLYMER DEVICES : LIGHT-EMITTING AND PHOTODETECTING DIODES , 1994 .

[7]  Barry P Rand,et al.  4.2% efficient organic photovoltaic cells with low series resistances , 2004 .

[8]  Ingo Riedel,et al.  Effect of Temperature and Illumination on the Electrical Characteristics of Polymer–Fullerene Bulk‐Heterojunction Solar Cells , 2004 .

[9]  R. Friend,et al.  Built-in field electroabsorption spectroscopy of polymer light-emitting diodes incorporating a doped poly(3,4-ethylene dioxythiophene) hole injection layer , 1999 .

[10]  B. Mazhari,et al.  An improved solar cell circuit model for organic solar cells , 2006 .

[11]  Christoph J. Brabec,et al.  Physics of organic bulk heterojunction devices for photovoltaic applications , 2006 .

[12]  Mats Andersson,et al.  Polymer Photovoltaic Cells with Conducting Polymer Anodes , 2002 .

[13]  Yang Yang,et al.  High-efficiency solution processable polymer photovoltaic cells by self-organization of polymer blends , 2005 .

[14]  N. S. Sariciftci,et al.  Flexible, conjugated polymer-fullerene-based bulk-heterojunction solar cells: Basics, encapsulation, and integration , 2005 .

[15]  Robert Mertens,et al.  Extraction of bulk and contact components of the series resistance in organic bulk donor-acceptor-heterojunctions , 2002 .

[16]  Christoph J. Brabec,et al.  Design Rules for Donors in Bulk‐Heterojunction Solar Cells—Towards 10 % Energy‐Conversion Efficiency , 2006 .