Related Experiment Video
Updated: Apr 21, 2026
08:12
Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
10.3K
Homogenizing Buried Interfacial Contact and Halide Distribution in Wide-Bandgap Perovskites for Efficient Tandem
Ze Li1, Tianhe Dong1, Haijin Li1
1School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China.
ACS Applied Materials & Interfaces
|April 20, 2026
Summary
A new benzylammonium thiocyanate (BnASCN) interlayer improves wide-bandgap perovskite solar cells by homogenizing interfaces and halide distribution. This boosts efficiency to 22.5% and enhances stability, enabling 30.9% efficient tandem cells.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Wide-bandgap perovskite solar cells are key for tandem devices but suffer from phase separation due to poor interfaces and uneven halide distribution.
- These issues cause nonradiative recombination, limiting device performance and stability.
Purpose of the Study:
- To introduce a benzylammonium thiocyanate (BnASCN) interlayer to improve wide-bandgap perovskite solar cells.
- To address phase separation by homogenizing interfacial contact and halide distribution.
Main Methods:
- Incorporation of a BnASCN interlayer at the buried interface of wide-bandgap perovskites.
- Analysis of interfacial contact uniformity, halide distribution, and film crystallinity.
- Fabrication and testing of single-junction and tandem perovskite solar cells.
Main Results:
- BnASCN suppressed aggregation of aluminum oxide nanoparticles, creating a uniform buried interface.
- BnASCN formed strong coordination with halide ions, leading to homogeneous halide distribution and enhanced perovskite film crystallinity.
- Single-junction devices achieved a 22.5% power conversion efficiency (PCE).
- BnASCN-modified devices retained 90% of their PCE after 150 hours of operation, significantly improving stability.
- Perovskite/silicon tandem cells reached a 30.9% PCE.
Conclusions:
- The BnASCN interlayer effectively optimizes wide-bandgap perovskite solar cells by improving interface and halide uniformity.
- This strategy enhances both the efficiency and operational stability of perovskite-based photovoltaic devices.
- The developed approach shows great promise for high-efficiency perovskite/silicon tandem solar cells.
