Structural origin of gap states in semicrystalline polymers and the implications for charge transport

Autor:	Rivnay, Jonathan, Noriega, Rodrigo, Northrup, John E., Kline, R. Joseph, Toney, Michael F., Salleo, Alberto
Rok vydání:	2010
Předmět:	Condensed Matter - Materials Science Condensed Matter - Soft Condensed Matter
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.83.121306
Popis:	We quantify the degree of disorder in the {\pi}-{\pi} stacking direction of crystallites of a high performing semicrystalline semiconducting polymer with advanced X-ray lineshape analysis. Using first principles calculations, we obtain the density of states of a system of {\pi}-{\pi} stacked polymer chains with increasing amounts of paracrystalline disorder. We find that for an aligned film of PBTTT the paracrystalline disorder is 7.3%. This type of disorder induces a tail of trap states with a breadth of ~100 meV as determined through calculation. This finding agrees with previous device modeling and provides physical justification for the mobility edge model. Comment: Text and figures are unchanged in the new version of the file. The only modification is the addition of a funding source to the acknowledgments
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1012.2240 Zobrazit plný text záznamu View this record from Arxiv