Related Experiment Video
Updated: Jul 29, 2025
08:12
Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
9.6K
Pinhole-free 2D Ruddlesden-Popper perovskite layer with close packed large crystalline grains, suitable for
Parsa Darman1, Amin Yaghoobi1, Sara Darbari2
1Nano-Sensors and Detectors Lab., and Nano Plasmo-Photonic Research Group, Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran.
Scientific Reports
|May 24, 2023
Summary
We developed high-quality 2D Ruddlesden-Popper Perovskite (RPP) layers for fast-response photodetectors. Oxygen plasma treatment and controlled crystal growth enabled efficient, stable, and low-cost optoelectronic devices.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Physics
Background:
- 2D Ruddlesden-Popper Perovskites (RPP) show promise for optoelectronic applications due to their stability and light absorption.
- Developing high-quality RPP layers with controlled morphology is crucial for device performance.
- Existing fabrication methods like exfoliation face scalability and repeatability challenges.
Purpose of the Study:
- To achieve pinhole-free, close-packed 2D RPP (BA2PbI4) layers suitable for optoelectronic devices.
- To investigate the key parameters influencing the hot casting process for RPP layers.
- To develop a scalable and cost-effective fabrication method for RPP-based photodetectors.
Main Methods:
- Hot casting of BA2PbI4 precursor solutions.
- Oxygen plasma treatment prior to hot casting.
- Controlled substrate temperature and rotational speed to manage solvent evaporation.
- Varied precursor molarity to control layer thickness.
Main Results:
- Achieved pinhole-free, polycrystalline 2D RPP (BA2PbI4) layers with large crystalline grains (approx. 30x30 µm²).
- Demonstrated that oxygen plasma treatment significantly improves RPP layer quality at lower temperatures.
- Showcased control over crystal growth via solvent evaporation rate and layer thickness via precursor molarity.
- Fabricated RPP-based photodetectors with fast response (189 µs rise, 300 µs fall), high responsivity (119 mA/W), and detectivity (2.15x10^8 Jones) at 450 nm.
Conclusions:
- Oxygen plasma treatment is vital for high-quality RPP layer formation during hot casting.
- Crystal growth and thickness of 2D RPP layers can be precisely controlled by adjusting fabrication parameters.
- The developed method offers a simple, low-cost, and scalable approach for producing stable and high-performance RPP photodetectors.
- The fabricated photodetectors exhibit performance comparable to single-crystal counterparts but are suitable for mass production.
