Surface passivation is an effective method to protect the surfaces and improve the luminescence properties of perovskite (PS) films. CdSe/ZnS core-shell quantum dots (QDs) have been employed for surface passivation of PS films because of their size-dependent tunable bandgaps. Herein, the energy transfer (ET) behavior of CH3NH3PbI2Br PS films covered with CdSe/ZnS QDs (QD/PS hybrid structures) is characterized by using photoluminescence (PL) and time-resolved PL spectroscopy. The PL decay time and the integrated PL intensity of the QD/PS hybrid structure increase compared with those of the bare PS films, owing to ET from the QDs to the PS and reduced charge traps. The ET efficiency increases from ~7% to 63% for the QD/PS hybrid structure when the core diameter of the QDs decreases from 6.5 to 2.7 nm, respectively. This can be explained by the charge transfer rate enhancement due to the control of energy level alignment of QDs. These results allow us to understand fundamental mechanisms such as ET from QDs to PS films as a function of the size of the QD.

译文

:表面钝化是保护表面并改善钙钛矿(PS)膜发光性能的有效方法。 CdSe / ZnS核-壳量子点(QDs)已被用于PS膜的表面钝化,因为它们的尺寸取决于可调带隙。在此,通过使用光致发光(PL)和时间分辨PL光谱来表征覆盖有CdSe / ZnS QDs(QD / PS杂化结构)的CH3NH3PbI2Br PS薄膜的能量转移(ET)行为。与裸PS膜相比,QD / PS杂化结构的PL衰减时间和积分PL强度增加,这是由于从QD到PS的ET以及电荷陷阱的减少。当QDs的芯径分别从6.5nm减小到2.7nm时,QD / PS混合结构的ET效率从7%增至63%。这可以通过控制QD的能级对齐来提高电荷传输速率来解释。这些结果使我们能够了解基本机制,例如从QD到PS薄膜的ET,它们是QD尺寸的函数。

+1
+2
100研值 100研值 ¥99课程
检索文献一次
下载文献一次

去下载>

成功解锁2个技能,为你点赞

《SCI写作十大必备语法》
解决你的SCI语法难题!

技能熟练度+1

视频课《玩转文献检索》
让你成为检索达人!

恭喜完成新手挑战

手机微信扫一扫,添加好友领取

免费领《Endnote文献管理工具+教程》

微信扫码, 免费领取

手机登录

获取验证码
登录