Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 54: Organic semiconductors

HL 54.2: Talk

Friday, March 16, 2018, 09:45–10:00, EW 203

Investigation of charge transport in solution processed and vacuum-deposited organic semiconductors — •Deepthi K. Mangalore, Paul W. M. Blom, and Gert-Jan A.H. Wetzelaer — Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany

Organic light emitting diodes based on pi-conjugated polymers have been instrumental in revolutionizing the area of displays and lighting in the last decade. The immense opportunity presented by this technology has driven the research to find cheaper alternatives to the traditional deposition method of thermal evaporation. At the same time, the solubility of organic semiconductors in organic solvents enables film deposition from the solutions and the charge transport in these films has not been fully investigated. This work examines the transport in solution processed organic small molecule films and presents a comparison to the charge transport in vacuum-deposited films. Temperature-dependent space-charge-limited currents in single carrier devices of two hole transporting materials α-NPD and Spiro-TAD are used to investigate the transport properties in pristine and doped devices (dopants- F4TCNQ , F6TCNNQ). After optimizing the deposition conditions, comparable hole mobilities (4*10-8 m2V-1s-1 for Spiro-TAD and 0.8*10-8 m2V-1s-1 for α-NPD) were obtained in pristine solution-processed and vacuum-deposited films. In addition, the J-V characteristics were also analyzed with the extended Gaussian disorder model.