Boosting the charge transport and stability of metal halide perovskite with boron nitride nanosheets for X-ray detection and imaging
Boosting the charge transport and stability of metal halide perovskite with boron nitride nanosheets for X-ray detection and imaging
复制标题
DOI：
10.1016/j.cej.2023.147945
复制
发表时间：
2023-12
影响因子：
15.1
通讯作者：
Fang Yao;Zhenglin Jia;JunQi Dong;Ruiming Li;Yujie Yang;Haitao Tang;Wusheng Zou;Jiangbin Zhao-Jiangbin-Z
中科院分区：
文献类型：
--
作者：
Fang Yao;Zhenglin Jia;JunQi Dong;Ruiming Li;Yujie Yang;Haitao Tang;Wusheng Zou;Jiangbin Zhao-Jiangbin-Z
金属卤化物钙钛矿材料具有优异的光电性能，在光电领域有着广泛的应用。然而，确保其在运行期间的稳定性仍然是一项重大挑战。在这项研究中，我们研究了钙钛矿薄膜和器件的载流子动力学，比较了在晶界上插入和不插入氮化硼的情况。结果表明，氮化硼纳米片在晶界上的存在，可以显着提高电荷传输和稳定性。氮化硼的掺入导致电荷载流子迁移率和寿命的实质性改善，而没有任何明显的相分离或光稳定性的变化。此外，掺入氮化硼的钙钛矿探测器表现出抑制的离子迁移和暗电流，同时表现出增强的光响应和辐射暴露能力。这些发现表明，添加绝缘氮化硼纳米片作为稳定剂，提高了钙钛矿薄膜和器件的稳定性。此外，氮化硼的掺入显著改善了受益于增强的电荷传输的器件性能，表明氮化硼纳米片增强的钙钛矿光电二极管具有用于X射线检测和成像的巨大潜力。
Metal halide perovskites have been widely used in optoelectronic applications due to their excellent optoelectronic properties. However, ensuring their stability during operation remains a significant challenge. In this study, we investigated the charge carrier dynamics of perovskite films and devices, comparing those with and without the insertion of boron nitride on the grain boundaries. It was revealed that the charge transport and stability could be significantly enhanced with the present of boron nitride nanosheets on the grain boundaries. The incorporation of boron nitride led to a substantial improvement in charge carrier mobility and lifetime, without any noticeable changes in phase segregation or photostability. Moreover, the perovskite detectors incorporating boron nitride exhibited suppressed ion migration and dark current, while demonstrating an enhanced photoresponse and radiation exposure capability. These findings indicate that the addition of insulating boron nitride nanosheets acts as a stabilizer, enhancing the stability of both the perovskite thin films and the devices. Additionally, the incorporation of boron nitride significantly improved the device performance benefiting from the enhanced charge transport, indicating that the boron nitride nanosheets enhanced perovskite photodiodes possess great potential for X-ray detection and imaging.