Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
All-inorganic perovskite CsPbX3 (X = Cl, Br, I) quantum dots (QDs) exhibit a high photoluminescence quantum yield, and is attracting attention due to the increasing demand for optoelectronic devices such as solar cells and light-emitting diodes (LEDs). In this study, we prepared a solution of CsPbBr3 QD synthesized by hot injection method and performed femtosecond transient absorption spectroscopy. In particular, we investigated the change in transient absorption during the process of improving luminous efficiency by water treatment.
To study the luminescence increment mechanism, a two-layer structure of oleylamine (OAm) aqueous solution (in the lower part) and CsPbBr3 QD hexane solution (in the upper part) was made, and transient absorption measurement under 400 nm excitation was performed for 8 hours.
As time passed, the OAm and/or water molecules moved up to the upper QD surface, and the increase in the photoluminescence occurred. Previous experiments have shown that the emission quantum yield increases from about 30% to about 70%. In the measurement of transient absorption, transient bleaching was confirmed to grow little by little 2 hours after the preparation of the two-layer structure. The bleaching reached its maximum amplitude after 3 or 4 hours, and gradually decreased till 8 hours. Since the bleaching intensity is proportional to the number of excitons generated, it was found that the excitation efficiency was increased by the water treatment. Ultrafast exciton quenching probably by the QD surface seems to be the main reason of the low emission quantum yield before the water treatment.
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