Solid-State Lithium-Ion Batteries as a Method for Doping Halide Perovskites with an In Situ Optical Readout of Dopant Concentration.
American Chemical Society (ACS)
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Mathieson, A., Feldmann, S., & De Volder, M. (2022). Solid-State Lithium-Ion Batteries as a Method for Doping Halide Perovskites with an In Situ Optical Readout of Dopant Concentration.. JACS Au https://doi.org/10.1021/jacsau.2c00212
Controlled doping of halide perovskites is a longstanding challenge for efficient optoelectronic applications. Here, a solid-state lithium-ion battery (LIB) inspired device is used as a method of extrinsically doping a halide perovskite in a controlled and measurable fashion. The Burstein-Moss band gap shift induced by the electronic doping is measured using in situ optical spectroscopy to monitor the fraction of injected charges that successfully n-type dope the perovskite. By comparing the optical and electrochemical readouts of the charge density, we demonstrate a 96% doping efficiency during the insertion process. Subsequent charge removal steps demonstrate only a partial "undoping" of the perovskite, providing insights into the capacity degradation pathways in perovskite LIB electrodes.
perovskite, electrochemical, doping, LIB, Burstein-Moss, photoluminescence
Engineering and Physical Sciences Research Council (1944209)
European Commission Horizon 2020 (H2020) ERC (866005)
Engineering and Physical Sciences Research Council (EP/L016087/1)
External DOI: https://doi.org/10.1021/jacsau.2c00212
This record's URL: https://www.repository.cam.ac.uk/handle/1810/337495
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