Extremely Slow Spontaneous Electron Trapping in Photodoped n-Type CdSe Nanocrystals.

Extremely Slow Spontaneous Electron Trapping in Photodoped n-Type CdSe Nanocrystals.
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光电掺杂 n 型 CdSe 纳米晶体中极慢的自发电子捕获。

DOI:
10.1021/acs.chemmater.7b00839
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发表时间:
2017
期刊:
Chemistry of materials : a publication of the American Chemical Society
影响因子:
--
通讯作者:
Gamelin,DanielR
Gamelin,DanielR
中科院分区:
--
文献类型:
--
作者:
Tsui,EmilyY;Carroll,GerardM;Miller,Brigit;Marchioro,Arianna;Gamelin,DanielR

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采用直接光学方法研究了光化学还原法制备的胶体简并掺杂n-CdSe纳米晶的导带电子俘获动力学。纳米晶体显示出自发的电子捕获与分布式动力学,扩展到非常长的时间尺度。量子限制和表面离子化学计量引起的能带边缘电位的位移也测量光谱电化学技术,并讨论了它们与慢电子捕获的关系。在这些测量中观察到的非常长的电子捕获时间尺度与原子重排比与基本的电子转移过程更一致。这种缓慢和广泛分布的电子捕获动力学让人想起众所周知的分布式动力学的闪烁光致发光闪烁,并讨论了这两种现象之间的潜在关系。
The trapping dynamics of conduction-band electrons in colloidal degenerately dopedn-CdSe nanocrystals prepared by photochemical reduction (photodoping) were measured by direct optical methods. The nanocrystals show spontaneous electron trapping with distributed kinetics that extend to remarkably long time scales. Shifts in nanocrystal band-edge potentials caused by quantum confinement and surface ion stoichiometry were also measured by spectroelectrochemical techniques, and their relationship to the slow electron trapping is discussed. The very long electron-trapping time scales observed in these measurements are more consistent with atomic rearrangement than with fundamental electron-transfer processes. Such slow and broadly distributed electron-trapping dynamics are reminiscent of the well-known distributed dynamics of nanocrystal photoluminescence blinking, and potential relationships between the two phenomena are discussed.
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