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Processing Induced Distinct Charge Carrier Dynamics of Bulky Organic Halide Treated Perovskites by Dou, Benjia Dak; deQuilettes, Dane W.; Laitz, Madeleine; Brenes, Roberto; Wang, Lili; Wassweiler, Ella L; Swartwout, Richard; Yoo, Jason J.; Sponseller, Melany; Hartono, Noor Titan Putri; Sun, Shijing; Buonassisi, Tonio; Bawendi, Moungi G; Bulovic, Vladimir is a scholarly article available to read on EtoBox.

What is Processing Induced Distinct Charge Carrier Dynamics of Bulky Organic Halide Treated Perovskites about?

State-of-the-art metal halide perovskite-based photovoltaics often employ organic ammonium salts, AX, as a surface passivator, where A is a large organic cation and X is a halide. These surface treatments passivate the perovskite by forming layered perovskites (e.g., A2PbX4) or by AX itself serving as a surface passivation agent on the perovskite photoactive film. It remains unclear whether layered perovskites or AX is the ideal passivator due to an incomplete understanding of the interfacial impact and resulting photoexcited carrier dynamics of AX treatment. In the present study, we use TRPL measurements to selectively probe the different interfaces of glass/perovskite/AX to demonstrate the vastly distinct interfacial photoexcited state dynamics with the presence of A2PbX4 or AX. Coupling the TRPL results with X-ray diffraction and nanoscale microscopy measurements, we find that the presence of AX not only passivates the traps at the surface and the grain boundaries, but also induces an {\alpha}/{\delta}-FAPbI3 phase mixing that alters the carrier dynamics near the glass/perovskite interface and enhances the photoluminescence quantum yield. In contrast, the passivation with A2PbI4

Author

Dou, Benjia Dak; deQuilettes, Dane W.; Laitz, Madeleine; Brenes, Roberto; Wang, Lili; Wassweiler, Ella L; Swartwout, Richard; Yoo, Jason J.; Sponseller, Melany; Hartono, Noor Titan Putri; Sun, Shijing; Buonassisi, Tonio; Bawendi, Moungi G; Bulovic, Vladimir

Published

2022

Language

EN