Repository logo

Electrochemical Impedance Spectroscopy of All-Perovskite Tandem Solar Cells.

Published version

Repository DOI

Change log


Dey, Krishanu 
Fitzsimmons, Melissa R 
Chiang, Yu-Hsien 
Cameron, Petra J 


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.


Publication status: Published


40 Engineering, 34 Chemical Sciences, 3406 Physical Chemistry

Is Part Of


American Chemical Society (ACS)
EPSRC (EP/T02030X/1)
Engineering and Physical Sciences Research Council (EP/V027131/1)
European Research Council (756962)
Royal Society (13196)
Royal Society (URF\R\221026 and RF\ERE\221004)
Engineering and Physical Sciences Research Council (2405021)
Engineering and Physical Sciences Research Council (EP/P007767/1)
Engineering and Physical Sciences Research Council (EP/P024947/1)
Engineering and Physical Sciences Research Council (EP/R00661X/1)
Engineering and Physical Sciences Research Council (EP/S022139/1)
The authors acknowledge the EPSRC (EP/T02030X/1, EP/V027131/1) for funding. SDS 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. MRF acknowledges funding from the EPSRC Centre for Doctoral Training in Connected Electronic and Photonic Systems (EP/S022139/1). Y-HC 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.