Yu Bingcheng, Shi Jiangjian, Tan Shan, Cui Yuqi, Zhao Wenyan, Wu Huijue, Luo Yanhong, Li Dongmei, Meng Qingbo
Key Laboratory for Renewable Energy, Chinese Academy of Sciences (CAS), Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Beijing, 100190, China.
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.
Angew Chem Int Ed Engl. 2021 Jun 7;60(24):13436-13443. doi: 10.1002/anie.202102466. Epub 2021 May 6.
Besides widely used surface passivation, engineering the film crystallization is an important and more fundamental route to improve the performance of all-inorganic perovskite solar cells. Herein, we have developed a urea-ammonium thiocyanate (UAT) molten salt modification strategy to fully release and exploit coordination activities of SCN to deposit high-quality CsPbI film for efficient and stable all-inorganic solar cells. The UAT is derived by the hydrogen bond interactions between urea and NH from NH SCN. With the UAT, the crystal quality of the CsPbI film has been significantly improved and a long single-exponential charge recombination lifetime of over 30 ns has been achieved. With these benefits, the cell efficiency has been promoted to over 20 % (steady-state efficiency of 19.2 %) with excellent operational stability over 1000 h. These results demonstrate a promising development route of the CsPbI related photoelectric devices.
除了广泛使用的表面钝化之外，调控薄膜结晶是提高全无机钙钛矿太阳能电池性能的一条重要且更具根本性的途径。在此，我们开发了一种尿素-硫氰酸铵（UAT）熔盐改性策略，以充分释放并利用SCN的配位活性来沉积高质量的CsPbI薄膜，用于高效稳定的全无机太阳能电池。UAT是由尿素与NH₄SCN中的NH₄通过氢键相互作用衍生而来。借助UAT，CsPbI薄膜的晶体质量得到显著提高，并实现了超过30 ns的长单指数电荷复合寿命。得益于这些优势，电池效率提升至超过20%（稳态效率为19.2%），并在超过1000小时的时间内具有出色的运行稳定性。这些结果展示了CsPbI相关光电器件一条很有前景的发展路线。
