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Molecular Doping and Trap Filling in Organic Semiconductor Host-Guest Systems

G. Z. Zuo ; Z. J. Li ; O. Andersson ; H. Abdalla ; Ergang Wang (Institutionen för kemi och kemiteknik, Polymerteknologi) ; M. Kemerink
Journal of Physical Chemistry C (1932-7447). Vol. 121 (2017), 14, p. 7767-7775.
[Artikel, refereegranskad vetenskaplig]

We investigate conductivity and mobility of different hosts mixed with different electron-withdrawing guests in concentrations ranging from ultralow to high. The effect of the guest material on the mobility and conductivity of the host material varies systematically with the guests' LUMO energy relative to the host HOMO, in quantitative agreement with a recently developed model. For guests with a LUMO within similar to 0.5 eV of the host HOMO the dominant process governing transport is the competition between the formation of a deep tail in the host DOS and state filling. In other cases, the interaction with the host is dominated by any polar side groups on the guest and changes in the host morphology. For relatively amorphous hosts the latter interaction can lead to a suppression of deep traps, causing a surprising mobility increase by 1-2 orders of magnitude. In order to analyze our data, we developed a simple method to diagnose both the presence and the filling of traps.

Nyckelord: Heterojunction Solar-Cells, Field-Effect Transistors, Electrophosphorescent Devices, Processing Additives, Zinc-Phthalocyanine, Conjugated Polymers, Charge-Transport, Photovoltaic



Denna post skapades 2017-06-13.
CPL Pubid: 249738

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Polymerteknologi

Ämnesområden

Kemiteknik

Chalmers infrastruktur