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Point defects and their impact in next generation solar cells revealed by in-situ positron annihilation spectroscopy

Positron Annihilation Spectroscopy (PAS) is a very sensitive method to reveal the presence of vacancy-related point defects in thin film solar cells. Its depth-range and resolution matches various types of existing and emerging thin film solar cells. We apply Positron annihilation spectroscopy (PAS) to monitor environmental degradation of ZnO/CIGS and of perovskite solar cells. Furthermore, we examine the presence of point defects and near-surface oxidation of thermally annealed RF-sputtered BaSi2 thin films. We show that the positron is a very sensitive probe for the surfaces of semiconductor quantum dots in thin film QD photovoltaic systems. Ab-initio modelling in combination with Positron Annihilation Lifetime Spectroscopy (PALS) provided first-time proof of the presence of the positron surface state underlying the very high sensitivity of positrons to probe surfaces of CdSe quantum dots.

Seminar: Neutrons in Research and Industry

Date27.01.2020
Time14:30 - 15:30 h
PlaceGarching, Germany
RoomHS 3 (Physics Department)
SpeakerDr. Stephan Eijt (Delft University of Technology)
Organizer

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Contact

Contact person

Dr. Alexandros Koutsioumpas and Dr. Christian Franz

E-mail

a.koutsioumpas@fz-juelich.de

URL

https://indico.frm2.tum.de/event/206/

MLZ is a cooperation between:

Technische Universität München> Technische Universität MünchenHelmholtz-Zentrum Geesthacht> Helmholtz-Zentrum GeesthachtForschungszentrum Jülich> Forschungszentrum Jülich

MLZ is a member of:

LENS> LENSERF-AISBL> ERF-AISBL

MLZ on social media:

The MLZ App – now available here! (Android)

MLZ App> MLZ App