In this work, we improved the photocurrent of self-powered ultraviolet photodetector via doping manganese in CsPbCl3 perovskite nanocrystals light harvester. The doped manganese in nanocrystals has the following three features to assist electron transfer from CsPbCl3 nanocrystals to titanium dioxide: (i) the fast exciton-to-manganese energy transfer process benefits for competing electrons with perovskite exciton recombination, (ii) the charge carrier lifetime is very long for manganese d-states due to its spin and orbital forbidden transition, and (iii) the electrons can effectively transfer to the titanium dioxide layer from 4T1 of manganese d-states due to the smaller energy barrier. Based on the above, the self-powered photocurrent density of photodetectors has nearly twice enhancement from 0.08 mA·cm−2 to 0.14 mA·cm−2 and a high responsivity up to 7.3 mA·W−1 was achieved at 340 nm.

中文翻译：

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碳基完全可印刷自供电紫外钙钛矿光电探测器：锰辅助电子转移和增强光电流

在这项工作中，我们通过在 CsPbCl3 钙钛矿纳米晶体光收集器中掺杂锰来改善自供电紫外光电探测器的光电流。纳米晶体中掺杂的锰具有以下三个特性，可帮助电子从 CsPbCl3 纳米晶体转移到二氧化钛：（i）激子到锰的快速能量转移过程有利于与钙钛矿激子复合的竞争电子，（ii）电荷载流子寿命由于其自旋和轨道禁止跃迁，锰 d 态非常长，并且 (iii) 由于较小的能垒，电子可以有效地从锰 d 态的 4T1 转移到二氧化钛层。综上所述，光电探测器的自供电光电流密度从 0.08 mA·cm-2 到 0 提高了近两倍。