We demonstrate a double nanoimprinting process that allows the formation of nanostructured polymer heterojunctions of composition and morphology that can be selected independently
2010
Key concepts
Scholarcy highlights
- In this paper, we demonstrate a double nanoimprinting process that allows the formation of nanostructured polymer heterojunctions of composition and morphology that can be selected independently
- It should be noted that our method is rather different from initial reports in the literature on PV devices containing imprinted P3HT
- We have shown that this novel imprinting method produces the best performance yet reported for a polymer-polymer system and this improvement results primarily through the improved fill factor over that obtained for solution demixed devices
- We consider that this is due to the avoidance of locally trapped photogenerated charges due to the poorly controlled morphology formed from the demixed polymer blend
- There is considerable room for improvement in power conversion efficiency if the device thickness can be increased while retaining efficient charge separation and collection
- Our work indicates that charge separation at polymer-polymer heterojunctions can be effective to polymerfullerene systems, and demonstrates that there is scope to find a broader range of electron acceptors beyond the widely used fullerenes that can provide high PV efficiency when the heterojunction morphology is controlled appropriately
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