Stability enhancement of lead-free CsSnI3 perovskite photodetector with reductive ascorbic acid additive
Stability enhancement of lead-free CsSnI3 perovskite photodetector with reductive ascorbic acid additive
复制标题
还原性抗坏血酸添加剂增强无铅 CsSnI3 钙钛矿光电探测器的稳定性
作者：
Cao Fengren;Tian Wei;Wang Meng;Wang Min;Li Liang
无铅锡基钙钛矿由于其无毒和潜在的商业化而吸引了广泛的研究兴趣。然而，由于其高密度的本征缺陷和Sn 2+在环境中易氧化，限制了其实际应用。为了解决这些问题，我们展示了一种基于CsSnI 3钙钛矿的环境友好的稳定宽带光电探测器，具有传统的SnF 2和还原剂抗坏血酸添加剂。通过优化抗坏血酸的浓度，最佳器件显示出高响应度（0.257 A W−1）、快速响应速度（0.35/1.6 ms）和优异的稳定性。其性能与大多数先前报道的无铅钙钛矿光电探测器相当。抗坏血酸促进了晶体生长，抑制了Sn ~（4+）的形成，使其具有良好的介电性，而不是金属性。
Lead‐free tin‐based perovskites have attracted widespread research interest due to their nontoxicity and potential commercialization. However, their practical application is limited by high density of intrinsic defects and easy oxidation of Sn2+in ambient environment. To address these issues, we demonstrate an environment‐friendly stable broadband photodetector based on CsSnI3perovskite with conventional SnF2and reducing agent ascorbic acid additive. Through optimizing the concentration of ascorbic acid, the optimal device reveals high responsivity (0.257 A W−1), fast response speed (0.35/1.6 ms), and excellent stability. The properties are comparable to most previously reported lead‐free perovskite photodetectors. The enhanced performance is mainly due to the fact that ascorbic acid promotes the crystal growth, suppresses the formation of Sn4+, and makes it have good semiconductivity rather than metallicity.