Van der Waals heterostructures incorporating graphene, perovskites and other 2D materials

在过去的十年中，卤化物钙钛矿一直受到材料科学界的极大兴趣，因为它们在高效太阳能电池和明亮发光器件中的潜在用途。这些钙钛矿材料的一些关键属性包括廉价的制造工艺、强吸收系数和低非辐射载流子复合率。最近，二维卤化物钙钛矿晶体的合成已经实现，显示出有前途的稳定性，以及大的载流子迁移率和强烈的光致发光和电致发光。二维材料引发了前所未有的动力，推动了对一类新材料的研究：货车德瓦尔斯异质结构，由不同的二维晶体堆叠在彼此的顶部。这些人工材料具有新的和令人感兴趣的电子性质，利用了长程有序、二维激子或多体不稳定性（如超导性）的缺失，并允许观察量子相对论现象。本项目旨在通过将二维卤化物钙钛矿晶体与石墨烯堆叠在异质结构中来创建货车德瓦尔斯异质结构，并研究该组装体的电子性质。预计新器件将具有许多技术上重要的特性，并具有为创新半导体技术做出贡献的现实潜力。

For the past decade, halide perovskites have been subject to tremendous interest from the material science community, due to their potential use in high efficiency solar cells and bright light-emitting devices. Some key attributes of these perovskite materials include cheap fabrication processes, strong absorption coefficients and low non-radiative carrier recombination rates. Recently, the synthesis of 2D halide perovskite crystals have been achieved, demonstrating promising stability properties, as well as large carrier mobilities and intense photo- and electro-luminescence.2D materials have triggered an unparalleled momentum, driving research on a new class of materials: van der Waals heterostructures, consisting in different 2D crystals stacked on top of each-others. These artificial materials present new and intriguing electronic properties, taking advantage of the absence of long-range order, 2D excitons or many-bodies instabilities such as superconductivity, and allowing observation of quantum relativistic phenomena.This project aims at creating van der Waals heterostructures by stacking 2D halide perovskite crystals in heterostructures with graphene and studying the electronic properties of the assembly. The new devices are expected to have a number of technologically important properties and have a realistic potential to contribute to innovative semiconductor technologies.