Abstract
This work explores electrochemical impedance spectroscopy to study recombination and ionic processes in all-perovskite tandem solar cells. We exploit selective excitation of each subcell to enhance or suppress the impedance signal from each subcell, allowing study of individual tandem subcells. We use this selective excitation methodology to show that the recombination resistance and ionic time constants of the wide gap subcell are increased with passivation. Furthermore, we investigate subcell-dependent degradation during maximum power point tracking and find an increase in recombination resistance and a decrease in capacitance for both subcells. Complementary optical and external quantum efficiency measurements indicate that the main driver for performance loss is the reduced capacity of the recombination layer to facilitate recombination due to the formation of a charge extraction barrier. This methodology highlights electrochemical impedance spectroscopy as a powerful tool to provide critical feedback to unlock the full potential of perovskite tandem solar cells.
| Original language | English |
|---|---|
| Pages (from-to) | 442-453 |
| Number of pages | 12 |
| Journal | ACS Energy Letters |
| Volume | 9 |
| Early online date | 11 Jan 2024 |
| DOIs | |
| Publication status | Published - 9 Feb 2024 |
Funding
The authors acknowledge the EPSRC (EP/T02030X/1, EP/V027131/1) for funding. S.D.S. acknowledges the Royal Society and Tata Group (grant no. UF150033). The work has received funding from the European Research Council under the European Union’s Horizon 2020 research and innovation program (HYPERION, grant agreement no. 756962). Part of this work was undertaken using equipment facilities provided by the Henry Royce Institute, via the grant Henry Royce Institute, Cambridge Equipment: EP/P024947/1 and EP/R00661X/1, with additional funding from the “Centre for Advanced Materials for Integrated Energy Systems (CAM-IES)” (EP/P007767/1). K.D. acknowledges the support of the Cambridge Trust for the Cambridge India Ramanujan Scholarship and Cambridge Philosophical Society for the research studentship. M.R.F. acknowledges funding from the EPSRC Centre for Doctoral Training in Connected Electronic and Photonic Systems (EP/S022139/1). Y.-H.C. acknowledges the Taiwan Cambridge Trust and Rank Prize fund. For the purpose of open access, the authors have applied a Creative Commons Attribution (CC BY) license to any Author Accepted Manuscript version arising from this submission.
| Funders | Funder number |
|---|---|
| EPSRC Centre for Doctoral Training in Connected Electronic and Photonic Systems | EP/S022139/1 |
| Horizon 2020 Framework Programme | 756962 |
| Henry Royce Institute | EP/P024947/1, EP/P007767/1, EP/R00661X/1 |
| Engineering and Physical Sciences Research Council | EP/T02030X/1, EP/V027131/1 |
| Royal Society | |
| European Research Council | |
| Gates Cambridge Trust | |
| Tata Sons | UF150033 |
ASJC Scopus subject areas
- Chemistry (miscellaneous)
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Energy Engineering and Power Technology
- Materials Chemistry
