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Implementing Lattice and Energy Level Matching to Optimize Buried Interfaces for High-Performance Perovskite Solar
Yapeng Sun1, Jiankai Zhang2, Bo Yu1
1School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510640, China.
Small (Weinheim an Der Bergstrasse, Germany)
|October 23, 2024
Summary
Introducing a lead sulfide (PbS) interconnect layer in perovskite solar cells (PSCs) improves energy level alignment and crystal growth. This strategy enhances device performance and stability, achieving over 24% power conversion efficiency.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Interface engineering is crucial for high-performance perovskite solar cells (PSCs).
- Energy level and lattice mismatches at the buried interface significantly hinder device efficiency.
Purpose of the Study:
- To develop an in situ interconnect layer for improved interface contact in n-i-p PSCs.
- To investigate the role of a lead sulfide (PbS) layer in optimizing the SnO2/perovskite interface.
Main Methods:
- In situ growth of a thin PbS interconnect layer on SnO2.
- Theoretical calculations to analyze interface energy levels and lattice matching.
- In situ photoluminescence (PL) to study perovskite crystal growth.
- Device performance and stability testing.
Main Results:
- PbS forms an SnO2/PbS/Perovskite structure with matched energy levels and lattice.
- PbS increases SnO2 conductivity and upshifts Fermi energy levels, reducing open-circuit voltage loss.
- PbS acts as a template for bottom-up perovskite growth, improving crystallinity and interface contact.
- Achieved power conversion efficiency exceeding 24% with enhanced device stability.
Conclusions:
- PbS interconnect layers effectively resolve interface mismatches in PSCs.
- This strategy leads to efficient charge transfer, reduced voltage loss, and improved device performance.
- The in situ PbS approach offers a viable pathway for high-efficiency and stable perovskite solar cells.
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