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2022 Adv. Mater., 22.26% Stable PCE! Reducing The Electronic Defects via Crystal Growth Regulation of Perovskite Films?

SS-X solar simulator makes the breakthrough possible!
Top-Notch Due to It’s Precision!

  How to reduce electronic defects in perovskite thin films? This question has become a major challenge to improve the photovoltaic performance of perovskite solar cells.

  On March 1st, 2022, Advanced Materials (IF 30.849) published a study on how to regulate the crystal growth of 2D/3D perovskite thin films for efficient and stable solar cells. The research team used a two-step deposition method to regulate crystal growth in 2D/3D perovskite films, introducing 2D (NpMA)2PbI4 perovskite and 1-naphthalenemethylammonium iodide (NpMAI) separately into a PbI2 precursor solution. The perovskite films modulated by (NpMA)2PbI4 greatly improved quality and enlarged grain size from ≈500 nm to >1000 nm. In addition, grain-boundary defects were also significantly reduced; charge carrier lifetime was improved; ionic diffusion was successfully hindered.

Perovskite Solar Simulator measurement J-V test result

  The research team used Enlitech’s SS-F5-3A solar simulator (now the SS-X Solar Simulator) to conduct the current density-voltage (J-V) test of all optical photovoltaic devices. The test was conducted under the illumination of the xenon light source AM 1.5G solar simulator and measured with forward and reverse scans. At the same time, the research team also used the QE-R quantum efficiency measurement system of Enlitech for external quantum efficiency (EQE) detection. The results showed that the 0.10 cm−2 small-area device exhibited a remarkable high power conversion efficiency (PCE) of 24.37%, and the 1.01 cm−2 large-area device exhibited an excellent 22.26% high power conversion efficiency (PCE). More importantly, observing the maximum power point (MPP) of the unencapsulated component under continuous illumination, the component still retained more than 98% of its initial efficiency after 1500 hours illumination, demonstrating operational stability.

  In addition to the EQE (External Quantum Efficiency) spectrum analysis of solar cells, the Quantum Efficiency Measurement System of Enlitech also provides Jsc (short-circuit current density) comparison for the short-circuit current of solar cells under the solar simulator to prove the authenticity of the experiment. The solar simulator and KA-6000 software of Enlitech also provide monitoring of the short-circuit current over time to prove the stability of the solar cell!

Perovskite quantum efficiency EQE measurement
Perovskite Solar Simulator measurement AM1.5G
Results of forward and reverse scan under the AM 1.5G 100 mW cm-2 solar simulator.

Keywords: Perovskite Films Regulation, solar simulator, sun simulator, quantum efficiency

Article link: https://doi.org/10.1002/adma.202200705

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