Institute of Chemical Research of Catalonia-The Barcelona Institute of Science and Technology (ICIQ-BIST), Avda. Països Catalans 16, 43007, Tarragona, Spain.
Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel⋅lí Domingo s/n, 43007, Tarragona, Spain.
Chemphyschem. 2019 Oct 16;20(20):2702-2711. doi: 10.1002/cphc.201900068. Epub 2019 Jun 26.
Truxene derivatives, due to their molecular structure and properties, are good candidates for the passivation of defects when deposited onto hybrid lead halide perovskite thin films. Moreover, their semiconductor characteristics can be tailored through the modification of their chemical structure, which allows-upon light irradiation- the interfacial charge transfer between the perovskite film and the truxene molecules. In this work, we analysed the use of the molecules as surface passivation agents and their use in complete functional solar cells. We observed that these molecules reduce the non-radiative carrier recombination dynamics in the perovskite thin film through the supramolecular complex formation between the Truxene molecule and the Pb defects at the perovskite surface. Interestingly, this supramolecular complexation neither affect the carrier recombination kinetics nor the carriers collection but induced noticeable hysteresis on the photocurrent vs voltage curves of the solar cells under 1 sun illumination.
均三嗪衍生物由于其分子结构和性质，是沉积在混合卤化铅钙钛矿薄膜上钝化缺陷的理想选择。此外，通过修饰其化学结构可以调整其半导体特性，这使得在光照下钙钛矿薄膜和均三嗪分子之间可以发生界面电荷转移。在这项工作中，我们分析了这些分子作为表面钝化剂的用途以及它们在完整功能太阳能电池中的用途。我们观察到，这些分子通过均三嗪分子与钙钛矿表面的 Pb 缺陷之间的超分子配合物的形成，减少了钙钛矿薄膜中的非辐射载流子复合动力学。有趣的是，这种超分子配合物既不影响载流子复合动力学，也不影响载流子收集，但在 1 个太阳光照下会使太阳能电池的电流-电压曲线产生明显的滞后。
