Operando dynamics of trapped carriers in perovskite solar cells observed via infrared optical activation spectroscopy.

Autor: Pan J; Department of Chemistry and Centre for Processible Electronics, Imperial College London, London, W12 0BZ, UK., Chen Z; Department of Chemistry and Centre for Processible Electronics, Imperial College London, London, W12 0BZ, UK. z.chen@imperial.ac.uk., Zhang T; Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, SE-58183, Sweden., Hu B; Department of Chemistry and Centre for Processible Electronics, Imperial College London, London, W12 0BZ, UK., Ning H; Department of Chemistry and Centre for Processible Electronics, Imperial College London, London, W12 0BZ, UK., Meng Z; Department of Chemistry and Centre for Processible Electronics, Imperial College London, London, W12 0BZ, UK., Su Z; Department of Chemistry and Centre for Processible Electronics, Imperial College London, London, W12 0BZ, UK., Nodari D; Department of Chemistry and Centre for Processible Electronics, Imperial College London, London, W12 0BZ, UK., Xu W; Department of Chemistry and Centre for Processible Electronics, Imperial College London, London, W12 0BZ, UK., Min G; Department of Chemistry and Centre for Processible Electronics, Imperial College London, London, W12 0BZ, UK., Chen M; Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, SE-58183, Sweden., Liu X; Laboratory of Organic Electronics, ITN, Linköping University, Norrköping, SE-60174, Sweden., Gasparini N; Department of Chemistry and Centre for Processible Electronics, Imperial College London, London, W12 0BZ, UK., Haque SA; Department of Chemistry and Centre for Processible Electronics, Imperial College London, London, W12 0BZ, UK., Barnes PRF; Department of Physics, Imperial College London, London, SW7 2AZ, UK., Gao F; Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, SE-58183, Sweden., Bakulin AA; Department of Chemistry and Centre for Processible Electronics, Imperial College London, London, W12 0BZ, UK.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2023 Dec 04; Vol. 14 (1), pp. 8000. Date of Electronic Publication: 2023 Dec 04.
DOI: 10.1038/s41467-023-43852-5
Abstrakt: Conventional spectroscopies are not sufficiently selective to comprehensively understand the behaviour of trapped carriers in perovskite solar cells, particularly under their working conditions. Here we use infrared optical activation spectroscopy (i.e., pump-push-photocurrent), to observe the properties and real-time dynamics of trapped carriers within operando perovskite solar cells. We compare behaviour differences of trapped holes in pristine and surface-passivated FA 0.99 Cs 0.01 PbI 3 devices using a combination of quasi-steady-state and nanosecond time-resolved pump-push-photocurrent, as well as kinetic and drift-diffusion models. We find a two-step trap-filling process: the rapid filling (~10 ns) of low-density traps in the bulk of perovskite, followed by the slower filling (~100 ns) of high-density traps at the perovskite/hole transport material interface. Surface passivation by n-octylammonium iodide dramatically reduces the number of trap states (~50 times), improving the device performance substantially. Moreover, the activation energy (~280 meV) of the dominant hole traps remains similar with and without surface passivation.
(© 2023. The Author(s).)
Databáze: MEDLINE
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