Dark excitons and long-lived, light-induced defect states in (EPEA)2PbI4

Varun Mapara; Shashi Sourabh; Tielyr Creason; Hadi Afshari; Bayram Saparov; Ian R. Sellers; Madalina I. Furis

doi:10.1117/12.3003258

9 March 2024 Dark excitons and long-lived, light-induced defect states in (EPEA)₂PbI₄

Varun Mapara, Shashi Sourabh, Tielyr Creason, Hadi Afshari, Bayram Saparov, Ian R. Sellers, Madalina I. Furis

Proceedings Volume PC12881, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XIII; PC1288105 (2024) https://doi.org/10.1117/12.3003258
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

The 2D Ruddlesden- Popper perovskite (EPEA)2PbI4 was investigated using temperature - and power -dependent PL and TA spectroscopy. This endeavor revealed the presence of multiple excitonic complexes in these materials, with signatures of carrier redistribution mediated by power and/or temperature, and the presence of extremely long-lived dark states in TA. These states appear to be light -induced defects which heal after illumination ceases. As such, they bring new insight into failure mechanisms and material design approaches in perovskite photovoltaics

Conference Presentation

Citation Download Citation

Varun Mapara, Shashi Sourabh, Tielyr Creason, Hadi Afshari, Bayram Saparov, Ian R. Sellers, and Madalina I. Furis "Dark excitons and long-lived, light-induced defect states in (EPEA)₂PbI₄", Proc. SPIE PC12881, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XIII, PC1288105 (9 March 2024); https://doi.org/10.1117/12.3003258

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