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Operation Limits of Integrated Photo-Rechargeable Batteries
Byung-Man Kim1, Arvind Pujari1,2, Hooman Abbasi1
1Institute for Manufacturing, Department of Engineering, University of Cambridge, Cambridge, UK.
Advanced Materials (Deerfield Beach, Fla.)
|July 17, 2026
Summary
Monolithic photo-rechargeable batteries (PRBs) have charging limitations. This study reveals that hole transport decay and cathode delithiation potential are key factors affecting PRB performance, offering design insights.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Monolithic photo-rechargeable batteries (PRBs) are crucial for autonomous off-grid systems.
- Understanding the fundamental limitations of light-charging processes in PRBs is essential for performance optimization.
Purpose of the Study:
- To investigate the factors limiting light-charging efficiency in integrated PRB devices.
- To correlate photo-charging current decay with underlying photo-induced charge kinetics.
Main Methods:
- Development of an integrated PRB model system capable of charging under various illuminances.
- Analysis of photo-induced charge kinetics and their relationship with device performance.
- Correlation of charging current decay with state of charge and material properties.
Main Results:
- Photo-induced hole transport deteriorates with increasing state of charge due to anion-coupled hole accumulation in the cathode.
- A critical potential gap between the hole transport layer and cathode is required for efficient photo-induced delithiation.
- Rapid decay in photo-charging current occurs if the cathode delithiation potential exceeds the hole transport level, even with sufficient charging voltage.
Conclusions:
- The device physics of monolithic PRBs differ significantly from systems with separate solar cells and batteries.
- Anion-coupled hole accumulation and cathode delithiation potential are critical parameters for PRB design.
- Findings provide new insights into PRB working mechanisms and offer guidelines for future device development.
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