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Updated: Jun 22, 2025
Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
Highly oriented MAPbI3 crystals for efficient hole-conductor-free printable mesoscopic perovskite solar cells
Shuang Liu1, Deyi Zhang1, Yusong Sheng1
1Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
Researchers developed a new method to create highly crystalline perovskite films for efficient solar cells. This approach inhibits rapid nucleation and promotes crystal growth, enhancing performance and stability.
Area of Science:
- Materials Science
- Renewable Energy
Background:
- Efficient and stable perovskite solar cells require highly crystalline films with large grains and minimal grain boundaries.
- Current fabrication methods often lead to rapid nucleation and insufficient crystal growth, limiting device performance.
Purpose of the Study:
- To develop a novel method for crystallizing methylammonium lead iodide (MAPbI3) perovskite films within a triple mesoscopic scaffold.
- To inhibit nucleation and promote crystal growth for improved perovskite film quality and solar cell efficiency.
Main Methods:
- Modulating the precursor solution using N-methylformamide for high solubility and reduced colloid formation.
- Adding methylammonium chloride to further reduce potential nucleation sites.
- Controlling solvent evaporation speed to allow sufficient crystal growth time.
- Utilizing a TiO2/ZrO2/carbon triple mesoscopic scaffold with disordered pores.
Main Results:
- Obtained highly oriented MAPbI3 crystals with suppressed non-radiative recombination and enhanced charge transport.
- Fabricated hole-conductor-free, printable mesoscopic perovskite solar cells achieving a power conversion efficiency of 18.82%.
- Demonstrated excellent operational stability (1000 h at 55°C) and damp-heat stability (1340 h at 85°C/85% RH).
Conclusions:
- The developed method effectively controls perovskite crystallization for high-quality films.
- The resulting perovskite solar cells show high efficiency and promising long-term stability.
- This approach offers a pathway for fabricating stable and efficient perovskite solar devices.
