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Environmental photostability of SF_6-etched silicon nanocrystals

机译:SF_6刻蚀的硅纳米晶体的环境光稳定性

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We report on the long-term environmental stability of the photoluminescent (PL) properties of silicon nanocrystals (SiNCs). We prepared sulfur hexafluoride (SF_6) etched SiNCs in a two-stage plasma reactor and investigated their PL stability against UV irradiation in air. Unlike SiNCs with hydrogen-passivated surfaces, the SF_6-etched SiNCs exhibit no photobleaching upon extended UV irradiation despite surface oxidation. Furthermore, the PL quantum yield also remains stable upon heating the SF_6-etched SiNCs up to 160°C. The observed thermal and UV stability of SF_6-etched SiNCs combined with their PL quantum yields of up to 50% make them attractive candidates for UV downshifting to enhance the efficiency of solar cells. Electron paramagnetic spin resonance indicates that the SF_6-etched SiNCs have a lowered density of defect states, both as-formed and after room temperature oxidation in air.
机译:我们报告了硅纳米晶体(SiNCs)的光致发光(PL)特性的长期环境稳定性。我们在两步等离子体反应器中制备了六氟化硫(SF_6)蚀刻的SiNC,并研究了它们在空气中对紫外线辐射的PL稳定性。与具有氢钝化表面的SiNC不同,经SF_6蚀刻的SiNC尽管经过表面氧化处理,但在长时间的紫外线照射下仍不会出现光致漂白。此外,在将经SF-6蚀刻的SiNC加热至160°C时,PL量子产率也保持稳定。观察到的被SF-6腐蚀的SiNC的热稳定性和UV稳定性以及高达50%的PL量子产率使它们成为UV下移以提高太阳能电池效率的有吸引力的候选者。电子顺磁自旋共振表明,SF-6腐蚀的SiNC的缺陷态密度降低,无论是初态还是在室温下在空气中氧化之后。

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