Led by Prof. Loh Kian Ping, the research team from the Department of Applied Physics at the Hong Kong Polytechnic University has made a significant advancement in the field of perovskites, a class of materials with diverse applications in solar cells, lighting, and catalysis. The team has achieved a groundbreaking accomplishment by successfully synthesizing all-organic two-dimensional perovskites, extending the field into the exciting realm of 2D materials.
Historically, the synthesis of all-organic three-dimensional perovskites has posed challenges due to the limited selection of organic molecules that can fit the crystal structure. To overcome this limitation, the researchers devised an innovative approach: they opted to synthesize all-organic perovskites in the form of two-dimensional layers instead of 3D crystals. This strategic shift enabled them to incorporate a broader range of organic ions, unlocking the emergence of novel and extraordinary properties.
The team developed a new class of layered organic perovskites, dubbed the "Choi-Loh-v phase" (CL-v), which comprise molecularly thin layers held together by van der Waals forces. These two-dimensional organic perovskites exhibit a fundamental difference from traditional three-dimensional minerals, as they are single-crystalline in two dimensions and can be easily exfoliated.
Notably, the CL-v phase demonstrated dielectric constants surpassing those of commonly used materials, presenting a promising pathway for their integration into two-dimensional electronic devices as a high-performance dielectric layer. The team successfully showcased the application of CL-v as the top gate dielectric in a transistor, achieving superior performance compared to conventional silicon oxide.
This breakthrough not only establishes a new class of all-organic perovskites but also highlights their potential to enhance the efficiency and versatility of electronic systems through advanced fabrication techniques.
Read the full research paper in Science.
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