The Mn-doped CsPbCl₃ achieved more attention to improving the photophysical properties of CsPbCl₃ and dual emission. Mn-doping in CsPbCl₃ cannot match its PLQY with other inorganic lead halide perovskites. The PLQY of Mn-doped CsPbCl₃ improved by codoping other metal ions and mixing with other halides, but the postsynthesis surface passivation approach needs to be better explored. The current study explores the potential of TCA as a surface engineering agent for Mn-doped CsPbCl₃ perovskite films. The lone pair electrons of the sulfur atom in TCA interact with the under-coordinated Pb ions on the perovskite surface and passivate the surface defects in perovskites. The XRD pattern and TEM images confirmed that TCA passivation did not affect the crystallinity and particle size. The interaction of TCA is confirmed by XPS analysis. The introduction of TCA suppressed nonradiative recombination and enhanced the photophysical properties. Photoluminescence spectra and lifetime decay profiles confirm the passivation effect of TCA. The relative PLQY of Mn-doped CsPbCl₃ increased from 21% to 50%, and the lifetime increased from 8.70 to 9.56 ns. The TCA passivated Mn-CsPbCl₃ showed better photoresponsivity than the unpassivated one as the surface defect states were reduced.

中文翻译：

---

通过噻吩-2-羧酸表面工程制备锰掺杂 CsPbCl3 钙钛矿纳米晶体：对光响应研究的影响

Mn掺杂的CsPbCl _{3在改善CsPbCl 3}的光物理性能和双发射方面引起了更多关注。 CsPbCl ₃中的Mn掺杂其PLQY无法与其他无机卤化铅钙钛矿相匹配。通过共掺杂其他金属离子和与其他卤化物混合，Mn掺杂CsPbCl ₃的PLQY得到改善，但合成后表面钝化方法需要更好地探索。目前的研究探讨了 TCA 作为 Mn 掺杂 CsPbCl ₃钙钛矿薄膜表面工程剂的潜力。 TCA中硫原子的孤对电子与钙钛矿表面的欠配位Pb离子相互作用，钝化钙钛矿的表面缺陷。 XRD图谱和TEM图像证实TCA钝化不会影响结晶度和粒径。 XPS 分析证实了 TCA 的相互作用。 TCA的引入抑制了非辐射复合并增强了光物理性质。光致发光光谱和寿命衰减曲线证实了 TCA 的钝化效果。 Mn掺杂CsPbCl ₃的相对PLQY从21%增加到50%，寿命从8.70 ns增加到9.56 ns。由于表面缺陷态减少，TCA钝化的Mn-CsPbCl 3 比未钝化的Mn-CsPbCl _{3显示出更好的光响应性。}