22‐3: Tuning ETL Mobility by Disorder Passivation

• Published in: SID International Symposium Digest of technical papers Vol. 52; no. 1; pp. 270 - 273
• Main Authors: Kaiser, Simon, Symalla, Franz, Wehl, Daniel, Neumann, Tobias, Wenzel, Wolfgang
• Format: Journal Article
• Language: English
• Published: Campbell Wiley Subscription Services, Inc 01-05-2021
• Subjects: Current carriers; Design rules of OLED materials and devices; Electron mobility; Electron transport; Morphology; Multiscale OLED simulations; Tuning OLED performance; Virtual Design of OLEDs
• ISSN: 0097-966X; 2168-0159
• DOI: 10.1002/sdtp.14666

In organic electronics (OE) application a high degree of control of material parameters such as transport levels and charge carrier mobilities is required to build a balanced device. We demonstrate that electron mobility of the prototypical electron transport material TPBi can be tuned freely by mixing it with a secondary electron transport inert material. We can in particular increase electron mobility in TPBi by up to a factor of 10 by diluting TPBi. This increase is due to a reduced electrostatic disorder in the mixed morphology. Using our predictive ab‐initio based modeling tools we can find the optimal mixture to maximize or pinpoint electron mobility in TPBi.