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Updated: Aug 2, 2025
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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
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Inhibiting Interfacial Diffusion in Heterojunction Perovskite Solar Cells by Replacing Low-Dimensional Perovskite
Congcong Tian1, Anxin Sun1, Jianghu Liang1
1School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 20024, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|April 18, 2023
Summary
A novel amorphous ionic polymer (AIP) heterojunction enhances perovskite solar cell durability and efficiency. This polymer-based interface prevents degradation under thermal stress, unlike other heterojunctions, promising practical applications.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Surface heterojunctions are key to improving perovskite solar cell (PSC) efficiency.
- The long-term durability of PSCs with different heterojunctions under thermal stress remains a critical, understudied challenge.
- Understanding interfacial stability is crucial for advancing PSC technology.
Purpose of the Study:
- To investigate and compare the thermal stability of various heterojunctions in perovskite solar cells.
- To develop a novel heterojunction strategy for enhanced device durability and efficiency.
- To evaluate the performance and stability of a new three-dimensional perovskite/amorphous ionic polymer (3D/AIP) heterojunction.
Main Methods:
- Synthesized a quaternized polystyrene to create a three-dimensional perovskite/amorphous ionic polymer (3D/AIP) heterojunction.
- Constructed 3D/2D and 3D/1D heterojunctions using benzylammonium chloride and benzyltrimethylammonium chloride for comparison.
- Subjected devices to thermal aging (400 h) and wet aging (3000 h) to assess durability.
- Analyzed interfacial diffusion and cation volatility under thermal stress.
Main Results:
- 3D/2D and 3D/1D heterojunctions exhibited severe interfacial diffusion due to volatile organic cations.
- The 3D/AIP heterojunction demonstrated exceptional stability under thermal stress, attributed to strong ionic bonding and high polymer molecular weight.
- The AIP interface reduced voltage loss from nonradiative recombination by 0.088 V.
- Devices with 3D/AIP heterojunction achieved a 24.27% power conversion efficiency and retained 90% of initial efficiency after aging.
Conclusions:
- The 3D/AIP heterojunction offers superior thermal and environmental stability compared to traditional 2D and 1D heterojunctions.
- Amorphous ionic polymers provide a robust interface for perovskite solar cells, mitigating degradation pathways.
- The developed 3D/AIP heterojunction shows significant promise for the practical application of highly efficient and durable perovskite solar cells.
