Ortiz-Cervantes Carmen, Román-Román Priscila I, Vazquez-Chavez Josué, Hernández-Rodríguez Marcos, Solis-Ibarra Diego
Laboratorio de Fisicoquímica y Reactividad de Superficies (LaFReS), Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, CU, Coyoacán, 04510, Ciudad de México, México.
Instituto de Química, Universidad Nacional Autónoma de México, CU, Coyoacán, 04510, Ciudad de México, México.
Angew Chem Int Ed Engl. 2018 Oct 15;57(42):13882-13886. doi: 10.1002/anie.201809028. Epub 2018 Sep 27.
Two-dimensional (2D) organic-inorganic perovskites have rapidly become an attractive alternative to traditional three-dimensional (3D) perovskite solar-cell absorbers owing to their improved stability and processability. Despite their advantages, the insulating nature of the organic cations and diminished light absorption limit their overall performance. Herein, it is demonstrated that the incorporation of conjugated diynes in hybrid 2D perovskites, and subsequent thermal treatment results in the formation of 2D perovskites that incorporate polydiacetylenes in their structure. Furthermore, it is shown that oxygen or iodine doping results in the formation of stable radicals within the material alongside a drastic shift of the band gap from 3.0 to 1.4 eV and in-plane conductivity improvements of up to three orders of magnitude, which lead to record conductivities for 2D halide perovskites (n=1).
二维（2D）有机-无机钙钛矿由于其稳定性和可加工性的提高，迅速成为传统三维（3D）钙钛矿太阳能电池吸收剂的有吸引力的替代品。尽管它们具有优势，但有机阳离子的绝缘性质和光吸收的减弱限制了它们的整体性能。在此，证明了在混合2D钙钛矿中引入共轭二炔并随后进行热处理会导致形成在其结构中包含聚二乙炔的2D钙钛矿。此外，结果表明，氧或碘掺杂会导致材料中形成稳定的自由基，同时带隙从3.0 eV急剧转变为1.4 eV，面内电导率提高多达三个数量级，这导致2D卤化物钙钛矿（n = 1）的电导率达到创纪录水平。
