Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 33: Poster Session III

CPP 33.7: Poster

Tuesday, March 13, 2018, 14:00–16:00, Poster C

Study on inner structure and carrier dynamics of colloidal quantum dots solids — •Wei Chen and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching

Colloidal quantum dots (CQDs) have attracted a lot of research interests in both optoelectronics and photovoltaics due to their unique properties, including tunable band-gap, solution processability and the high monodispersity. Due to the intensive investigations on their surface engineering, CQDs based homo-junction solar cells have achieved similar power conversion efficiency (PCE) as compared to top-class bulk heterojunction (BHJ) organic solar cells. The surface engineering is working on not only decreasing the trap states of CQDs* surface, but also optimizing the positions of each CQDs among the array, which is supposed to be the key factor to achieve higher charge mobility. We use inorganic and organic iodide ions sources to proceed the ligands exchanges on the surface of CQDs during the solids forming by spin coating in a layer by layer fashion. We use grazing incidence small angel x-ray scattering to confirm the inner structure changes of the films, including the inner dot spacing and the structures in larger scale, of CQDs solids under different ambient conditions. Moreover, the femtosecond pump-probe transient absorption spectroscopy (TA) is used to study the carrier dynamics of CQDs solids.