Determining the optimum morphology in high-performance polymer-fullerene organic photovoltaic cells

Determining the optimum morphology in high-performance polymer-fullerene organic photovoltaic cells

The morphology of bulk heterojunction organic photovoltaic cells controls many of the performance characteristics of devices. However, measuring this morphology is challenging because of the small length-scales and low contrast between organic materials. Here we use nanoscale photocurrent mapping, ultrafast fluorescence and exciton diffusion to observe the detailed morphology of a high-performa...

Recent Progress in the Understanding and Manipulation of Morphology in Polymer: Fullerene Photovoltaic Cells

Polymer-fullerene bulk heterojunctions : morphology and its implications on the performance and stability of photovoltaic devices

Over the last decade, great improvements have been made within the field of organic BHJ solar cells. It has become clear that the active layer morphology plays a key role in achieving competitive devices. Within this work, the active layer morphology of several polymer:PCBM systems is correlated with the performance and stability of the corresponding solar cells. The morphology of polymer:fulle...

High performance organic photovoltaic cells with blade-coated active layers

High performance bulk heterojunction organic photovoltaic (OPV) cells with blade-coated active layers of POD2T-DTBT blended with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) are demonstrated in this work. The blade-coated cells exhibit power conversion efficiencies of up to 6.74%, which is comparable to those of conventional spincoated cells but obtained with just a fraction of the mater...

Morphology of polymer/fullerene bulk heterojunction solar cells

Within the different organic photovoltaic devices the conjugated polymer/fullerene bulk heterojunction approach is one of the foci of today’s research interest. These devices are highly dependent on the solid state nanoscale morphology of the two components (donor/acceptor) in the photoactive layer. The need for finely phase separated polymer–fullerene blends is expressed by the limited exciton...