High-performance perovskite solar cells fabricated at high speed and low temperature.
Nanotechnology (Saitama University Research Seed Collection 2025-25 p.114)
High performance, self-organization, passivation, solution process, anti-solvent free, high durability, surface free energy, p-i bulk film formation.
Perovskite refers to a type of crystal structure composed of halogen elements such as lead or tin combined with iodine or bromine, along with organic alkyl ammonium ions. The perovskite structure is used as the light-absorbing layer in perovskite solar cells. The perovskite layer, which can be formed easily and at low temperatures through a solution process, has a thickness of 0.3 μm, which is about 1/500th the thickness of single and multicrystalline silicon solar cells that typically range from 150 to 200 μm, making it resource-efficient. By utilizing the electrostatic interactions between poly-electrolytes and nanoparticles, as well as self-assembled monolayers of phosphoric compounds, it becomes possible to fabricate high-performance perovskite solar cells quickly and easily on textured transparent conductive films at low temperatures. Additionally, by adding fluorine-based materials with low surface free energy to the perovskite precursor and simply applying and heating it, the materials can spontaneously segregate to the perovskite surface, allowing for passivation of the perovskite surface. This leads to enhanced performance of the solar cells and promises improved durability.
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Ryo Ishikawa, Assistant Professor Graduate School of Science and Engineering, Department of Mathematical and Electronic Information, Field of Electrical and Electronic Physics 【Recent Research Themes】 ● Enhancing the performance of perovskite solar cells using chelating compounds ● Fully coated solar cells using carbon electrodes ● Fabrication and application of highly oriented perovskite thin films by adding quasi-two-dimensional perovskite ● Doping organic semiconductors with fluorinated Lewis acids and applications in solar cells
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【Appeal Points to the Industry】 ● Utilizing polyelectrolytes enables the formation of electron transport layers on uneven substrates at high speed and low temperature. ● Although interface modification increases the number of processes and time, self-assembled passivation can be simplified and accelerated. ● p-i bulk film formation allows for easy uniform coating. ● There are expectations for applications in light-emitting devices and optical/X-ray detectors beyond solar cells. 【Examples of Practical Use, Applications, and Utilization】 ● High-speed, low-temperature electron transport layer formation on uneven substrates (Chem. Lett. 53(8), upae158, 2024). ● Enhancement of perovskite solar cells through the addition of fluorophenyl phosphate (Next Materials. 6,100283, 2025). ● High-performance inverted structure perovskite solar cells through p-i bulk film formation (85th Autumn Meeting of the Japan Society of Applied Physics, 19p-C302-3, 2024).
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p-i bulk film inverted structure perovskite solar cell
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.