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Subsurface photoluminescence lifetime imaging of photovoltaic materials using multiphoton tomography
Author(s): Karsten König; Benedikt Ursprung; Edward S. Barnard; Hans Georg Breunig
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Paper 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.

Paper Details

Date Published: 22 February 2019
PDF: 6 pages
Proc. SPIE 10882, Multiphoton Microscopy in the Biomedical Sciences XIX, 108820F (22 February 2019); doi: 10.1117/12.2509458
Show Author Affiliations
Karsten König, JenLab GmbH (Germany)
Saarland Univ. (Germany)
Benedikt Ursprung, Lawrence Berkeley National Lab. (United States)
Edward S. Barnard, Lawrence Berkeley National Lab. (United States)
Hans Georg Breunig, JenLab GmbH (Germany)
Saarland Univ. (Germany)

Published in SPIE Proceedings Vol. 10882:
Multiphoton Microscopy in the Biomedical Sciences XIX
Ammasi Periasamy; Peter T. C. So; Karsten König, Editor(s)

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