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2. Contributors

Author

Yaser Abdi, Irfan Ahmed, Jamilur R. Ansari, A. Arulraj, Fatemeh Behrouznejad, Cristina Besleaga, Rachel Elizabeth Brophy, Paulina Carmona-Monroy, Amreesh Chandra, Yonghua Chen, Faisal Islam Chowdhury, Towhid H. Chowdhury, Alejandro Cortés-Villena, Marina Cuzminschi, Sarah Derbali, Nicolae Filipoiu, Mihaela Florea, Raquel E. Galian, Somayeh Gholipour, Subrata Ghosh, G. Krishnamurthy Grandhi, Meenakshi Gussain, Mahboubeh Hadadian, Waseem Haider, Mohammad Hatamvand, Wei Huang, Neha Jain, Sakshi Kansal, Movaffaq Kateb, Mohammad Khalid, Dinesh Kumar, Maning Liu, Chung-Hsin Lu, R.V. Mangalaraja, Andrei Manolescu, Pandiyarajan Mariyappan, Mohan Lal Meena, Tudor Luca Mitran, Md. Farhan Naseh, George Alexandru Nemnes, Julia Pérez-Prieto, Ioana Pintilie, Shivam Porwal, Surbhi Priya, M. Atikur Rahman, C. Rajkumar, Bart Roose, Ignacio Rosa-Pardo, Mohammad Sajedi Alvar, T.S. Shyju, Anupriya Singh, Rajan Kumar Singh, Trilok Singh, Diego Solis-Ibarra, Sudipta Som, Viorica Stancu, Choudhary Arjun Sunilbhai, Radha Tamrakar, Andrei G. Tomulescu, Brenda Vargas, P. Vengatesh, Paola Vivo, Mozhgan Yavari, and Yiqiang Zhan

Published
2023
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3. Ab initio studies on perovskites

Author

Tudor Luca Mitran, Rachel Elizabeth Brophy, Marina Cuzminschi, Nicolae Filipoiu, Movaffaq Kateb, Ioana Pintilie, Andrei Manolescu, and George Alexandru Nemnes

Published
2023
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4. Capacitive and inductive effects in perovskite solar cells: the different roles of ionic current and ionic charge accumulation

Author

Nicolae Filipoiu, Amanda Teodora Preda, Dragos-Victor Anghel, Roxana Patru, Rachel Elizabeth Brophy, Movaffaq Kateb, Cristina Besleaga, Andrei Gabriel Tomulescu, Ioana Pintilie, Andrei Manolescu, and George Alexandru Nemnes

Subjects
Condensed Matter - Materials Science, General Physics and Astronomy, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences
Abstract

Dynamic hysteresis effects have been long known to occur in the J-V characteristics of perovskite solar cells (PSCs), with the ionic migration being identified as the primary factor. The hysteretic effects impacted early studies by the uncertainty in the evaluation of the power conversion efficiency, while currently, potential links to degradation mechanisms are in the focus. Therefore, understanding ion migration is a central goal, typically addressed by performing a combined large- and small signal analysis. The reported large capacitive and inductive effects created controversies with respect to the underlying mechanisms, yielding essentially two classes of models, one based on large accumulation capacitances and the other based on ionic modulation of the collected current. We introduce here an equivalent circuit model and interpret these phenomena in terms of recombination current modulation, identifying the distinct contributions from ion current and ionic charge accumulations. These contributions to the recombination current are associated with capacitive and inductive effects, respectively, and we corroborate the numerical simulations with electrochemical impedance spectroscopy (EIS) measurements. These show the role of the recombination currents of photogenerated carriers in producing both capacitive and inductive effects as the illumination is varied. Moreover, we provide a bridging point between the two classes of models and suggest a framework of investigation of defect states based on the observed inductive behavior, which would further aid the mitigation of the degradation effects., 20 pages

Published
2022

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