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In Situ Epitaxial Quantum Dot Passivation Enables Highly Efficient and Stable Perovskite Solar Cells
Yahya A Alzahrani1, Raghad M Alqahtani2, Raghad A Alqarni2
1Future Energy Technologies Institute, King Abdulaziz City for Science and Technology (KACST), Riyadh 11442, Saudi Arabia.
Nanomaterials (Basel, Switzerland)
|July 12, 2025
Summary
This study introduces core-shell perovskite quantum dots (PQDs) to passivate perovskite solar cells (PSCs). This advanced passivation strategy significantly boosts power conversion efficiency (PCE) and device stability.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Perovskite solar cells (PSCs) face challenges with efficiency limitations and stability due to surface defects and grain boundaries.
- Non-radiative recombination at these defects hinders optimal charge transport and reduces overall device performance.
Purpose of the Study:
- To develop an advanced passivation strategy for PSCs using core-shell structured perovskite quantum dots (PQDs).
- To investigate the impact of PQDs on PSC performance, including power conversion efficiency (PCE), open-circuit voltage (Voc), short-circuit current density (Jsc), and fill factor (FF).
- To evaluate the enhanced photoresponse and long-term stability of PSCs modified with PQDs.
Main Methods:
- Introducing core-shell structured PQDs (MAPbBr3 cores, tetra-OAPbBr3 shells) during the antisolvent-assisted crystallization of PSCs.
- Optimizing PQD concentration for maximum performance enhancement.
- Characterizing device performance using techniques such as current-voltage (J-V) measurements and incident photon-to-current efficiency (IPCE) spectroscopy.
- Conducting long-term stability tests under ambient conditions.
Main Results:
- The optimized PQD passivation increased PSC power conversion efficiency (PCE) from 19.2% to 22.85%.
- Key device metrics improved: Voc rose from 1.120 V to 1.137 V, Jsc from 24.5 mA/cm2 to 26.1 mA/cm2, and FF from 70.1% to 77%.
- PQD-modified devices showed enhanced photoresponse (400-750 nm) and retained over 92% of their initial PCE after 900 hours, significantly outperforming control devices (~80% retention).
Conclusions:
- In situ integrated core-shell PQDs offer an effective passivation strategy for PSCs by minimizing defects and non-radiative recombination.
- This method enhances charge transport, leading to substantial improvements in device efficiency and operational stability.
- The findings highlight the potential of PQD passivation for developing next-generation, high-performance, and stable perovskite solar cells.
