Exploring new Chemically Processed, Scalable and Stable Bi-based Inorganic Photovoltaics Films

铅基混合钙钛矿的出现使光致发光领域发生了革命性变化。这些材料是高质量的半导体，可以在室温下从溶液中廉价沉积。然而，铅的毒性和这些钙钛矿的稳定性问题正在推动对更良性和稳定的替代品的新探索。在这个项目中，我们将尝试找到其他化学可加工的Bi基化合物，其类似于铅基钙钛矿的相同缺陷容限，但解决了前面提到的两个主要缺点。该项目将研究BiOI与硫属化物S和Se的系统掺杂对薄膜的光学和电子特性的影响。目的是在大面积化学生长薄膜中形成理想化的微观结构，并在这样做时优化物理性能和优化传输性能，以获得长的扩散长度。将进行不同的实验，并将深入了解路线，以改善传输性能和少数载流子寿命在生物氧化物和相关薄膜，并最大限度地提高设备接口的电荷提取，所有这些都应该提供一个更有效的光伏器件的路线。

The photovoltaics field has been revolutionized by the emergence of lead-based hybrid perovskites. These materials are high quality semiconductors that can be deposited cheaply, from solution, at room temperature. However, the toxicity of lead and stability issues for these perovskites are driving a new search for more benign and stable alternatives. In this project we will try to find other chemically processable Bi based compounds which resemble the same defect tolerance as Lead based perovskites, but tackling the two major drawbacks mentioned earlier. The project will study the effect of systematic doping of BiOI with chalcogenides S and Se on the optical and electronic properties of the films. The aim is to form idealized microstructures in large area, chemically grown thin films and in doing so optimize the physical properties and optimize transport properties to give long diffusion lengths. Different experiments will be conducted and will give insight into routes to improve the transport properties and minority-carrier lifetimes in BiOI and related films, and to maximize charge extraction at device interfaces, all of which should provide a route to more efficient photovoltaic devices.