Interfacial charge generation and recombination in organic and perovskite photovoltaics

H. Ohkita

doi:10.1117/12.3027232

30 September 2024 Interfacial charge generation and recombination in organic and perovskite photovoltaics

H. Ohkita

Proceedings Volume 13127, Physical Chemistry of Semiconductor Materials and Interfaces XXIII; 1312707 (2024) https://doi.org/10.1117/12.3027232
Event: Organic Photonics + Electronics, 2024, San Diego, California, United States

Abstract

Herein, we have studied interfacial charge generation and recombination in polymer solar cells and perovskite solar cells. First, we focused on interfacial charge generation in ternary blend polymer solar cells based on a conjugated donor polymer, a fullerene derivative acceptor, and a near-IR dye molecule. On the basis of transient absorption analysis, we found rapid charge generation of polymer polarons and fullerene anions upon the photoexcitation of dye molecules. This finding shows that dye molecules should be located at the donor/acceptor interface in the ternary blend. We also discussed why dye molecules are spontaneously located at the interface. Next, we focused on interfacial charge recombination in perovskite solar cells. More specifically, we discussed how ambient-storage results in energy matching at the interface between perovskite and hole-transporting layers and hence can suppress interfacial charge recombination effectively. In addition, passivation to the interface also can suppress interfacial charge recombination even before the ambient-storage. In either case, open-circuit voltage is effectively improved because of suppressed interfacial charge recombination.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

H. Ohkita "Interfacial charge generation and recombination in organic and perovskite photovoltaics", Proc. SPIE 13127, Physical Chemistry of Semiconductor Materials and Interfaces XXIII, 1312707 (30 September 2024); https://doi.org/10.1117/12.3027232

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