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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Poster Session III
CPP 50.17: Poster
Dienstag, 17. März 2020, 14:00–16:00, P1C
Unveiling the recombination processes of free carriers in high-efficient organic solar cells by steady-state photoinduced absorption and photocurrent spectroscopy — •Le Phuong1,2, Seyed Mehrdad Hosseini1, Chang Woo Koh3, Han Young Woo3, and Safa Shoaee1 — 1Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24-25, Potsdam-Golm 14476, Germany — 2Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam — 3Department of Chemistry, College of Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Republic of Korea
Coupling steady state photoinduced absorption (PIA) and photocurrent (PC) spectroscopy, we investigate the recombination dynamics of long-lived carriers in high-efficient PPDT2FBT/PC70BM bulk heterojunction (BHJ) solar cells. By comparing the PIA and PC data measured under open-circuit and short-circuit conditions, the absorption cross sections of free carriers can be evaluated. In addition, the excitation-fluence- and modulation-frequency-dependent PIA measurements enable to reveal the recombination mechanism of free carriers in the BHJ solar cells. Our results show that the PIAPC spectroscopy provides an alternative and versatile technique to understand the recombination and extraction processes of free carriers in BHJ solar cells [1].
[1]. L. Q. Phuong et al., J. Phys. Chem. C 123, 27417 (2019).