DataVXACS Energy LettersPaper
journal article·2024-12-13

Ionic Lockdown: Sealing Migration Channels across Device Interfaces in Mixed Halide Perovskite Solar Cells

Altaf Pasha, Shubhangi Bhardwaj, Andrew Torma, Kaveramma A. B., Nagaraj S. Naik, Isaac Metcalf, Mukaddar S. K., Hao Zhang, Mahesh Padaki, Suman Kalyan Sahoo, Aditya D. Mohite, Sushobhan Avasthi, R. Geetha Balakrishna

ACS Energy Letters· Volume 9· Issue 12
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Source abstract

Abstract

Ion migration in mixed halide perovskite (MHP) absorber layers limits the long-term stability of wide-band gap (WBG) solar cells, posing a challenge to commercialization. We address this challenge with an “ionic lockdown” strategy using a vinyl imidazolium–iodine couple, [VIm][I], at the device interface. The iodine counterion effectively occupies surface iodide vacancies, suppressing ion migration. This treatment neutralizes native defects and locks volatile iodide and organic cations, as evidenced by an increase in defect formation energies by ∼0.8 eV and activation energy for ion migration by ∼0.59 eV. We demonstrate this with MAPb(I 0.5 Br 0.5 ) 3, a highly unstable MHP composition. In situ GIWAXS under AM1.5G at 85 °C shows no peak splitting, confirming the photostability. Devices treated with [VIm][I] retain 90% power conversion efficiency (PCE) under continuous illumination and recover 99% PCE in the dark. These results highlight the potential of [VIm][I] for enhancing the stability of WBG cells across different compositions, paving the way for more durable perovskite-based photovoltaic technologies.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Centre for Nano and Material Sciences, Jain (Deemed-to-be) University, Jain Global Campus, Kanakapura, Bangalore 562112, Karnataka, India

Department of Chemical and Biomolecular Engineering, Rice University, Houston, Texas 77005, United States

Centre for Nanoscience and Engineering, Indian Institute of Science Bangalore, Bengaluru 560012, Karnataka, India

Applied Physics Program, Smalley-Curl Institute, Rice University, Houston, Texas 77005, United States

Department of Physics, SRM University AP, Amaravati 522240, Andhra Pradesh, India

Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States

Funding

United States - India Educational Foundation · Department of Science and Technology, Ministry of Science and Technology · Q-Pragathi project, Quantum Research Park (QuRP), Karnataka Innovation and Technology Society

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