Highly Efficient and Air-Stable Heterostructured Perovskite Quantum Dot Solar Cells Using a Solid-State...

Area of Science:

• Materials Science
• Nanotechnology
• Renewable Energy

Background:

• Perovskite quantum dots (PQDs) offer tunable optoelectronic properties but face challenges in defect control due to large surface areas.
• Improving the performance and stability of PQDs is crucial for their application in photovoltaics and optoelectronics.

Purpose of the Study:

• To develop a heterostructured PQD solar cell combining CsPbI3 and FAPbI3 for enhanced performance and stability.
• To investigate the effect of a multinary PQD layer formed via solid-state cation exchange on device efficiency and charge extraction.

Main Methods:

• Fabrication of a heterostructured solar cell using CsPbI3 and FAPbI3 PQD layers.
• Implementation of a solid-state A-site cation-exchange strategy to create a multinary PQD layer.
• Characterization of device performance, including power conversion efficiency (PCE), hysteresis, and stability.

Main Results:

• The heterostructured PQD solar cell achieved a power conversion efficiency (PCE) of 16.07% with negligible hysteresis.
• The internally graded heterojunction formed by solid-state diffusion facilitated more efficient charge extraction.
• The device demonstrated significantly enhanced stability, retaining 96% of its PCE after 1000 hours of ambient storage.

Conclusions:

• The developed heterostructured PQD solar cell architecture effectively addresses defect control challenges.
• This approach leads to improved charge extraction, higher efficiency, and remarkable operational stability.
• The findings pave the way for scalable and stable perovskite quantum dot-based solar cells.