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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: Poster III

CPP 28.5: Poster

Wednesday, March 20, 2024, 11:30–13:30, Poster C

Thickness and Temperature-Dependent Charge Carrier Mobility of Non-fullerene Acceptors in Single-Carrier Electron-Only Devices — •Khawla Alkhezaim, Shahidul Alam, and Frédéric Laquai — King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Physical Sciences and Engineering Division (PSE), Applied Physics Program (AP), Thuwal 23955-6900, Saudi Arabia.

The charge carrier mobility of organic semiconductors is crucial for high-efficiency organic solar cells. This study aims to investigate the charge carrier transport properties in disordered non-fullerene acceptors (NFAs), explicitly focusing on ITIC and its derivatives, namely, ITIC-4F and ITIC-4Cl. The charge carrier transport properties were investigated on single-carrier electron-only devices using the field-independent space-charge-limited-current (SCLC) method. To reveal the impact of order/disorder and halogenation, specifically fluorination or chlorination, thickness and temperature-dependent carrier mobilities were studied systematically. Furthermore, thermionic emission and Fowler-Nordheim tunneling models were applied to calculate the barrier heights at the metal/organic interfaces under forward and reverse bias conditions. Finally, different spectroscopic and microscopic techniques were used to further investigate the optical and morphological properties of the organic semiconductors.

Keywords: electron mobility; ITIC; Non fullerene; Fowler-Nordheim; KAUST