Xianqi Wei,Jiayi Lu,Silong Zhang,Jiashu Tang,Shichao Wu,Tengbo Lv,Xiaoli Wang
CsPbBr 3 (CPB) perovskite has demonstrated unique advantages as a photoelectric material. However, its stability and optoelectronic properties exhibit significantly susceptibility to environmental conditions during practical applications. Additionally, the synthesis of CPB often involves complex procedures and stringent requirements for the experimental environment, resulting in low yield. In this study, we employed an aqueous-phase synthesis method to incorporate strontium into CPB, aiming to enhance the long-term stability of the perovskite in aqueous solutions. And the introduction of strontium (Sr) is expected to improve the photoluminescent properties of the perovskite. The results demonstrate that the synthesized perovskite remains stable in aqueous solution for up to 264 h, with enhanced photoluminescence intensity and a blue shift attributed to the incorporation of strontium. This approach significantly increases the potential value of CPB perovskite for applications in optoelectronic materials and devices.
Jiaqi Wang,Hongye Dong,Zhirui Chen,Jingjing Hui,Xiangning Xu,Zijin Qiao,wang Yao,Qi Li,Cheng Mu
Tin-based perovskite solar cells (TPSCs) have been recognized as a viable lead-free alternative in the field of solar energy technology; however, their development is significantly limited by the oxidation of Sn²⁺ to Sn⁴⁺, which introduces deep-level defects and accelerates non-radiative recombination. In this study, cesium trifluoroacetate (CsTFA) is employed as an antioxidant additive to address these challenges. CsTFA not only effectively suppresses Sn²⁺ oxidation but also passivates intrinsic defect and alleviates the p-type self-doping effect. Consequently, CsTFA-doped devices exhibit significant enhancements in open-circuit voltage (VOC) and fill factor (FF), leading to a 14% enhancement in power conversion efficiency (PCE), along with significantly improved storage stability. This work provides a facile and efficient approach to mitigate Sn2+ oxidation and suppress non-radiative losses, offering a viable pathway toward high-performance, stable tin-based perovskite optoelectronic devices.
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