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Interface Engineering in a CdS-Modified PbS Nanosheet-FAPbI3 Heterostructure Enabling High-Performance Perovskite
Xuanling Liu1, Han Zhong1, Xuanyu Wang1
1State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China.
ACS Applied Materials & Interfaces
|July 29, 2025
Summary
CdS-modified PbS nanosheets improve perovskite solar cell performance and stability by passivating interfaces and inducing beneficial strain. This CdS-modified PbS approach enhances power conversion efficiency and device longevity.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Perovskite solar cells require high performance and stability.
- Heterointerfaces in perovskite solar cells are critical for efficiency and stability.
- Mismatched crystal and energy band structures at interfaces create recombination sites.
Purpose of the Study:
- To regulate strain in perovskite films using solid-phase materials (SPMs) for improved solar cell performance.
- To investigate and manipulate heterointerfaces between perovskites and SPMs.
- To enhance the power conversion efficiency and stability of perovskite solar cells.
Main Methods:
- Preparation of CdS-modified PbS nanosheets (CPS) via cation exchange with (200)-preferred PbS nanosheets.
- Fabrication of FAPbI3-CPS heterostructures (FAPI-CPS).
- Characterization of interface passivation and strain effects.
Main Results:
- CdS-modified PbS nanosheets effectively passivated heterointerfaces in FAPbI3-CPS.
- CdS layer suppressed carrier recombination and potentially blocked carrier transportation.
- FAPI-CPS devices exhibited enhanced power conversion efficiency.
- CPS nanosheets induced compressive strain in FAPbI3, improving device stability.
- Unencapsulated FAPI-CPS solar cells retained 92% of initial PCE after 2500 hours of storage.
Conclusions:
- CdS modification of PbS nanosheets is an effective strategy for passivating perovskite solar cell heterointerfaces.
- The induced compressive strain and interface passivation significantly enhance device performance and stability.
- This approach offers a promising route for developing highly efficient and durable perovskite solar cells.
