Sotelo-Lerma Merida, Fernandez-Izquierdo Leunam, Ruiz-Molina Martin A, Borges-Doren Igor, Haroldson Ross, Quevedo-Lopez Manuel
Department of Research in Polymers and Materials, Universidad de Sonora, Blvd. Luis Encinas y Rosales S/N, Hermosillo 83000, Sonora, Mexico.
Materials Science and Engineering Department, University of Texas at Dallas, 2601 North Floyd Road, RL 10, Richardson, TX 75080, USA.
Materials (Basel). 2024 Oct 21;17(20):5123. doi: 10.3390/ma17205123.
This paper investigates the optoelectronic properties of CsPbBr, a lead-based perovskite, and CsAgBiBr, a lead-free double perovskite, in composite thick films synthesized using mechanochemical and hot press methods, with poly(butyl methacrylate) as the matrix. Comprehensive characterization was conducted, including X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), UV-visible spectroscopy (UV-Vis), and photoluminescence (PL). Results indicate that the polymer matrix does not significantly impact the crystalline structure of the perovskites but has a direct impact on the grain size and surface area, enhancing the interfacial charge transfer of the composites. Optical characterization indicates minimal changes in bandgap energies across all different phases, with CsPbBr exhibiting higher photocurrent than CsAgBiBr. This is attributed to the CsPbBr superior charge carrier mobility. Both composites showed photoconductive behavior, with CsAgBiBr also demonstrating higher-energy (X-ray) photon detection. These findings highlight the potential of both materials for advanced photodetector applications, with CsAgBiBr offering an environmentally Pb-free alternative.
本文研究了以聚（甲基丙烯酸丁酯）为基质，采用机械化学法和热压法合成的复合厚膜中铅基钙钛矿CsPbBr和无铅双钙钛矿CsAgBiBr的光电性能。进行了全面的表征，包括X射线衍射（XRD）、拉曼光谱、扫描电子显微镜（SEM）、紫外可见光谱（UV-Vis）和光致发光（PL）。结果表明，聚合物基质对钙钛矿的晶体结构没有显著影响，但对晶粒尺寸和表面积有直接影响，增强了复合材料的界面电荷转移。光学表征表明，所有不同相的带隙能量变化极小，CsPbBr的光电流高于CsAgBiBr。这归因于CsPbBr具有优异的电荷载流子迁移率。两种复合材料均表现出光电导行为，CsAgBiBr还展示了更高能量（X射线）光子检测能力。这些发现突出了这两种材料在先进光电探测器应用中的潜力，CsAgBiBr提供了一种环境友好的无铅替代品。
