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Effect of Pelargonidin on carrier recombination lifetime of CTS quantum dots
Optik ( IF 3.1 ) Pub Date : 2020-01-21 , DOI: 10.1016/j.ijleo.2020.164275
Maya Mathew , Preetha KC

In the current work, we have prepared stacks of Copper tin sulphide (CTS)/Pelargonidin core/shell quantum dots on soda lime substrates by SILAR technique. Copper tin sulphide quantum dots were of tetragonal phase matching well with JCPDS 089-4714. The absorption coefficient of the core/shell quantum dots increased while the photoluminescence intensity decreased with increasing shell thickness. Decrease of charge carrier confinement energy due to leakage of wavefunction into the shell is the cause of fall in PL intensity. Three transitions were found in all the samples corresponding to 1Se-1Sh, 1Pe-1Ph and 1De-1Dh transitions using the non-interacting particle model. Charge carrier recombination lifetime of P state was found to be in the order of 100 ns, with lifetime increasing with shell thickness, probably due to the P state being the most occupied at room temperature and decrease of surface trap sites with increasing shell thickness. Owing to the high lifetime of CTS/Pelargonidin core/shell quantum dots, these can be used effectively in solar cells where recombination time is a deciding factor for efficiency and also in bioimaging of living cells and tissues.



中文翻译:

芹菜素对CTS量子点载流子复合寿命的影响

在目前的工作中,我们已经通过SILAR技术在钠钙基板上制备了硫化铜锡(CTS)/紫精素核/壳量子点的堆叠体。硫化锡铜量子点与JCPDS 089-4714具有很好的四方相匹配。随着壳厚度的增加,核/壳量子点的吸收系数增加,而光致发光强度降低。由于波函数泄漏到壳中而导致的载流子限制能量的降低是PL强度下降的原因。使用非相互作用粒子模型,在所有样品中发现了三个跃迁,分别对应于1Se-1Sh,1Pe-1Ph和1De-1Dh跃迁。发现P状态的载流子复合寿命约为100 ns,并且寿命随壳厚度的增加而增加,可能是由于P状态在室温下占据最多,并且随着壳厚度的增加表面陷阱的位置减少。由于CTS /紫精素核/壳量子点的使用寿命长,它们可以有效地用于太阳能电池,其中重组时间是效率的决定性因素,并且还可以用于活细胞和组织的生物成像。

更新日期:2020-01-21
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