Ye Junzhi, Byranvand Mahdi Malekshahi, Martínez Clara Otero, Hoye Robert L Z, Saliba Michael, Polavarapu Lakshminarayana
Cavendish Laboratory, University of Cambridge, 19, JJ Thomson Avenue, Cambridge, CB3 0HE, UK.
Institute for Photovoltaics (ipv), University of Stuttgart, Pfaffenwaldring 47, 70569, Stuttgart, Germany.
Angew Chem Int Ed Engl. 2021 Sep 27;60(40):21636-21660. doi: 10.1002/anie.202102360. Epub 2021 May 28.
Lead-halide perovskites (LHPs), in the form of both colloidal nanocrystals (NCs) and thin films, have emerged over the past decade as leading candidates for next-generation, efficient light-emitting diodes (LEDs) and solar cells. Owing to their high photoluminescence quantum yields (PLQYs), LHPs efficiently convert injected charge carriers into light and vice versa. However, despite the defect-tolerance of LHPs, defects at the surface of colloidal NCs and grain boundaries in thin films play a critical role in charge-carrier transport and nonradiative recombination, which lowers the PLQYs, device efficiency, and stability. Therefore, understanding the defects that play a key role in limiting performance, and developing effective passivation routes are critical for achieving advances in performance. This Review presents the current understanding of defects in halide perovskites and their influence on the optical and charge-carrier transport properties. Passivation strategies toward improving the efficiencies of perovskite-based LEDs and solar cells are also discussed.
在过去十年中，卤化铅钙钛矿（LHP）以胶体纳米晶体（NC）和薄膜的形式，已成为下一代高效发光二极管（LED）和太阳能电池的主要候选材料。由于其高光致发光量子产率（PLQY），LHP能有效地将注入的电荷载流子转化为光，反之亦然。然而，尽管LHP具有缺陷容忍性，但胶体NC表面的缺陷和薄膜中的晶界在电荷载流子传输和非辐射复合中起着关键作用，这降低了PLQY、器件效率和稳定性。因此，了解在限制性能方面起关键作用的缺陷，并开发有效的钝化途径对于实现性能提升至关重要。本综述介绍了目前对卤化物钙钛矿中缺陷及其对光学和电荷载流子传输特性影响的理解。还讨论了提高基于钙钛矿的LED和太阳能电池效率的钝化策略。
