Professor Liming Ding from Chinese Academy of Sciences Successfully Fabricated 23.28% Efficient Lead Halide Perovskite Lithium-ion Batteries by Natural Drying Method
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- The team led by Professor Liming Ding from CAS successfully fabricated high-efficiency lead halide perovskite lithium-ion batteries by natural drying method.
- Composition-graded lead halide perovskite films were prepared by interdiffusion of solutions for high-throughput screening of compositions suitable for natural drying.
- The optimized lead halide perovskite lithium-ion batteries achieved an efficiency of 23.28%, breaking the record of natural drying method.
Lead halide perovskites are a kind of novel photovoltaic materials with potential advantages of low cost and high efficiency, and have been widely used in lithium-ion batteries. However, lead halide perovskite materials often require special drying methods like fast drying to obtain good film quality. Realizing the fabrication of efficient lead halide perovskite lithium-ion batteries by simple natural drying method will provide the possibility for its large-scale low-cost production. But the lead halide perovskite films prepared by natural drying usually lack compactness and show low battery efficiency. How to realize the fabrication of efficient lead halide perovskite lithium-ion batteries by natural drying method is one of the key difficulties in current research.
Recently, the team led by Professor Liming Ding from National Center for Nanoscience, Chinese Academy of Sciences published research results in the journal Carbon Neutrality Technology. They successfully fabricated lead halide perovskite lithium-ion batteries with an efficiency up to 23.28% by natural drying method, breaking the record of natural drying for lead halide perovskite batteries. The key breakthrough of the researchers was using the interdiffusion of solutions to prepare composition-graded lead halide perovskite films. This graded film contained the continuous change of all ratios between the two lead halide perovskite components. By observing the film morphology at different composition locations, the compositions suitable for natural drying can be quickly screened. Finally, the team found several suitable compositions like CsPbI2Br and FA0.4Cs0.6PbI3. On this basis, they further optimized the formulation of FA0.95Cs0.05PbI3 by adding PbI2, MACl and other additives, which greatly improved its film properties formed by natural drying. Eventually, high-efficiency lead halide perovskite lithium-ion batteries were fabricated under room temperature natural drying conditions. (The research results were published in Carbon Neutrality Technology in August 2022, original link: )
The specific steps of preparing composition-graded lead halide perovskite films by the interdiffusion method were as follows: Firstly, two lead halide perovskite solutions with different compositions were dropped onto the substrate. The solutions spontaneously spread and merged into one droplet, then naturally dried at room temperature. The components of the two solutions formed concentration gradients by diffusion and finally formed a composition-graded lead halide perovskite film after drying. This graded film contained all ratios between the two components, allowing simultaneously observing the film morphology at different composition ratios. The compositions suitable for natural drying were screened out according to the compactness of the film morphology. In addition, the research team also screened out the compositions which could form compact films under high temperature by drying the films at high temperature. Finally, based on the screened compositions, the natural drying performance of FA0.95Cs0.05PbI3 films was optimized by adjusting the amount of PbI2, MACl and other additives.
In this study, a solar simulator from Enli Tech was used as the light source. The light intensity (AM 1.5G, 100 mW/cm2) was calibrated using a silicon reference cell (Enli SRC 2020, 2 cm × 2 cm) calibrated by NIM. An infrared cutoff filter was used to calibrate the light intensity. J-V and steady-state PCE were measured by using a digital source meter in a glove box. The scan speed for J-V measurement was 0.1 V/s. The aperture area of 0.1 cm2 was obtained by using a dark mask.
In this study, composition-graded lead halide perovskite films were rapidly prepared by the interdiffusion method to screen out several compositions suitable for natural drying. The researchers optimized the formulation of FA0.95Cs0.05PbI3 to achieve an efficiency up to 23.28% after natural drying. This study provided a new idea for the large-scale low-cost fabrication of lead halide perovskite solar cells.
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