Quantifying electrochemical losses in perovskite solar cells

None Tulus, Junke Wang, Yulia Galagan, Elizabeth von Hauff (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

3 Citaten (Scopus)

Samenvatting

We quantify electrochemical losses in perovskite solar cells (PSCs) based on methylammonium lead triiodide (MAPbI3) films with impedance analysis. We focus on the characteristic signatures of impedance spectra taken from PSCs, in particular the negative capacitance hook widely observed in the low frequency regime. We elucidate the underlying physical origin for the negative capacitance by applying a generalized equivalent circuit model (ECM) for PSCs that accounts for fast electrical dynamics resulting in high frequency (HF) signatures due to electronic processes, and much slower electrochemical dynamics that result in low frequency (LF) signatures in the spectra. We observe relaxation times faster than 10−6 s in the HF regime that can be attributed to electrical dynamics, while relaxation times longer than 10−3 s in the LF regime that are consistent with electrochemical dynamics. The voltage-dependence and timescales of the electrochemical dynamics are consistent with MA+ and I migration in the MAPbI3 absorber layer. At higher applied voltages, we observe a highly non-linear response from the PSC which is consistent with irreversible chemical changes in the MAPbI3 absorber. We demonstrate how ECM modelling combined with the analysis of ECM fit quality is a useful approach for in situ monitoring and quantitative diagnosis of loss mechanisms in PSC.

Originele taal-2Engels
Pagina's (van-tot)2911-2920
Aantal pagina's10
TijdschriftJournal of Materials Chemistry C
Volume11
Nummer van het tijdschrift8
DOI's
StatusGepubliceerd - 28 feb. 2023
Extern gepubliceerdJa

Financiering

Tulus acknowledges the National Research and Innovation Agency (BRIN), the Republic of Indonesia for the scholarship Program for Research and Innovation in Science and Technology (RISET-Pro) World Bank Loan No. 8245-ID. Tulus, Elizabeth von Hauff and Yulia Galagan acknowledge the COST Action Stable Next Generation Photovoltaics (Grant No. MP1307) for support.

FinanciersFinanciernummer
Badan Riset dan Inovasi Nasional
European Cooperation in Science and Technology (COST)MP1307
Research and Innovation in Science and Technology Project8245-ID

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