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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 36: Organic Electronics and Photovoltaics III

CPP 36.3: Talk

Thursday, March 21, 2024, 10:00–10:15, H 0110

Optimizing Thermal Annealing Sequences for Enhanced Photovoltaic Performance in Organic Solar Cells — •Haya Aldosari^1,2, Shahidul Alam¹, José Jurado¹, and Frédéric Laquai¹ — ¹King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Physical Sciences and Engineering Division (PSE), Material Science and Engineering Program (MSE), Thuwal 23955-6900, Kingdom of Saudi Arabia — ²Department of Physics, College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 383, 31113, Dammam, Saudi Arabia

Thermal annealing is a widely used approach in organic solar cell research aimed at enhancing the performance of these devices. Therefore, the bulk heterojunction of PBDB-T:IT-2F was subjected to thermal annealing at various phases of the fabrication process to examine the impact of annealing on the photovoltaic characteristics. Several optoelectronic methods were employed to investigate the kinetics of charge recombination and the process of charge extraction. Based on the results of our investigation, it has been observed that both post-annealing and 2-stage-annealing methods contribute to the enhancement of fill factor and power conversion efficiency. However, the latter method has even greater advantages. Further research explores the impact of annealing on the hole transport layer (MoOx). The work function of MoOx was enhanced during the annealing process, leading to an increase in the internal electric field and a higher rate of charge carrier extraction. Finally, field-dependent charge generation processes were investigated using time-delayed collection field measurements.

Keywords: Organic photovoltaic; Thermal annealing; bulk heterojunction organic solar cells; hole transport layer; charge recombination and extraction