Reversible and Irreversible Degradation of CdS/ZnSe Nanocrystals Capped with Oleic Acid,Physica Status Solidi-Rapid Research Letters

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Reversible and Irreversible Degradation of CdS/ZnSe Nanocrystals Capped with Oleic Acid
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-05-06 , DOI: 10.1002/pssr.202000167
Mikhail Sergeevich Zabolotskii _{1,

2} , Alexey Victorovich Katsaba _{1,

2} , Sergey Aleksandrovich Ambrozevich _{1,

2,

3} , Alexei Grigorievich Vitukhnovsky _{1,

2} , Roman Borisovich Vasiliev ₄

Affiliation

Single‐photon processes of optically induced degradation of the photoluminescence intensity in CdS/ZnSe nanocrystals (NCs) are investigated, and the mechanisms of this degradation are established. It is demonstrated that three processes contribute to the photodegradation of the NCs. The corresponding characteristic times are of about 9.9 s, 260 s, and 2 h. In these experiments, it is found that the short‐term process in the degradation is caused by the activation of Auger recombination when a photoinduced hole is captured in a surface trap, and the long‐term process can be associated with the temperature‐induced detachment of the ligand (oleic acid) from the NC surface and activation of the non‐radiative relaxation channel. The hole detrapping time is calculated to be 135 s.

中文翻译：

油酸包覆的CdS / ZnSe纳米晶体的可逆和不可逆降解

研究了光诱导CdS / ZnSe纳米晶体（NCs）中光致发光强度降解的单光子过程，并建立了这种降解机理。结果表明，三个过程有助于NC的光降解。相应的特征时间约为9.9 s，260 s和2 h。在这些实验中，发现降解的短期过程是由于在表面陷阱中捕获光致空穴时，俄歇复合体的活化引起的，而长期过程可能与温度诱导的脱离有关。来自NC表面的配体（油酸）和非辐射弛豫通道的活化。计算出的空穴脱陷时间为135 s。

更新日期：2020-05-06

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