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Suppressed Defects by Functional Thermally Cross-Linked Fullerene for High-Efficiency Tin-Lead Perovskite Solar Cells
Jinbo Zhao1, Zhenhuang Su2, Jorge Pascual3
1Key Lab for Special Functional Materials of Ministry of Education, National & Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, School of Nanoscience and Materials Engineering, and Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng, 475004, P. R. China.
Researchers developed a new method using [6,6]-phenyl-C61-butyric styryl dendron ester (C-PCBSD) to stabilize tin-lead perovskites. This enhances solar cell efficiency and durability by preventing oxidation and improving film quality.
Area of Science:
- Materials Science
- Chemistry
- Physics
Background:
- Mixed tin-lead (Sn-Pb) perovskites offer narrow bandgaps suitable for photovoltaic applications, particularly tandem solar cells.
- Key challenges include Sn2+ oxidation, rapid crystallization, and interfacial traps, limiting their performance and stability.
Purpose of the Study:
- To improve the stability and performance of Sn-Pb perovskite thin films.
- To suppress surface defects and enhance bulk crystallinity using a novel additive.
Main Methods:
- Introduction of cross-linkable [6,6]-phenyl-C61-butyric styryl dendron ester (C-PCBSD) during perovskite thin film processing.
- Utilizing C-PCBSD's coordination ability to manage crystallization and prevent Sn2+ oxidation.
- Evaluating the impact of C-PCBSD on film properties, device performance, and long-term stability.
Main Results:
- C-PCBSD addition successfully suppressed Sn2+ oxidation and improved both bulk and surface crystallinity.
- Films exhibited reduced nonradiative recombination and enhanced interface charge extraction.
- C-PCBSD imparted superior hydrophobicity and oxygen resistance to the perovskite surface.
- Devices achieved a power conversion efficiency (PCE) of up to 23.4% and maintained 97% of their initial efficiency after 2000 hours of storage.
Conclusions:
- C-PCBSD is an effective additive for stabilizing Sn-Pb perovskites.
- The developed method significantly enhances the efficiency and operational stability of perovskite solar cells.
- This approach offers a promising pathway for advancing perovskite photovoltaic technology.
