Subsurface photoluminescence lifetime imaging of photovoltaic materials using multiphoton tomography

Karsten König; Benedikt Ursprung; Edward S. Barnard; Hans Georg Breunig

doi:10.1117/12.2509458

22 February 2019 Subsurface photoluminescence lifetime imaging of photovoltaic materials using multiphoton tomography

Karsten König, Benedikt Ursprung, Edward S. Barnard, Hans Georg Breunig

Proceedings Volume 10882, Multiphoton Microscopy in the Biomedical Sciences XIX; 108820F (2019) https://doi.org/10.1117/12.2509458
Event: SPIE BiOS, 2019, San Francisco, California, United States

Abstract

Multiphoton tomography based on tunable femtosecond near infrared 80 MHz laser radiation has been used to map twophoton- excited time-resolved photoluminescence with picosecond temporal resolution from in-bulk thin photovoltaic layers. The time-resolved photoluminescence reflects carrier lifetimes and is therefore an important measure for the efficiency of a solar cell. Conventional one-photon solar cell characterization methods are dominated by surface effects and cannot provide information on subsurface carrier dynamics. In contrast, by using two-photon excitation, subsurface carrier dynamics can be monitored in 3D, providing morphological and spatial information on local defects and crystalline grain boundaries We present results on time-resolved photoluminescence and second harmonic generation imaging in forward and backward directions of CdTe/CdS films by time-resolved single photon counting and false-color photoluminescence mapping. High-resolution two-photon optical sectioning was carried out with a modified multiphoton FLIM tomograph MPTflex employing near-infrared sensitive photodetectors.

Citation Download Citation

Karsten König, Benedikt Ursprung, Edward S. Barnard, and Hans Georg Breunig "Subsurface photoluminescence lifetime imaging of photovoltaic materials using multiphoton tomography", Proc. SPIE 10882, Multiphoton Microscopy in the Biomedical Sciences XIX, 108820F (22 February 2019); https://doi.org/10.1117/12.2509458

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