Regensburg 2025 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 3: Organic Electronics and Photovoltaics I
CPP 3.2: Talk
Monday, March 17, 2025, 09:45–10:00, H38
Evaluate the energy losses in non-fullerene based organic photovoltaic — •Maryam Alqurashi1, Shahidul Alam2, Jose Jurado1, Julien Gorenflot1, and Frederic Laquai1,2 — 1Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia — 2Physical Chemistry and Spectroscopy of Energy Materials, Department of Chemistry, Ludwig Maximilian University of Munich, D-81377 Munich, Germany
Organic photovoltaics that use non-fullerene acceptors are gaining popularity because they can potentially increase power conversion efficiency. However, they suffer from significantly higher total energy losses than inorganic photovoltaics, primarily due to non-radiative recombination, a process in which electron-hole pairs recombine without generating current. Electroluminescence spectroscopy helps evaluate charge transfer state energy, which is crucial in charge recombination. This study focused on three systems: PM6:Y6, PM6:IT-4F, and PM6:ITIC. The PM6:Y6-based device showed higher radiative recombination, while the PM6:IT-4F system exhibited the highest order of non-radiative recombination. The total open circuit voltage losses were 0.64 eV, 0.67 eV, and 0.56 eV for PM6:Y6, PM6:IT-4F, and PM6:ITIC, respectively. Despite PM6:Y6 achieving a higher power conversion efficiency, its open circuit voltage losses were comparable to that of the other two systems.
Keywords: Organic Photovoltaic; Non-fullerene Acceptors; Energy Losses; Charge Transfer States