Morphology-Dependent Ambient-Condition Growth of Perovskite Nanocrystals for Enhanced Stability in Photoconversion Device.

The Journal of Physical Chemistry Letters
Thanh-Hai LeHyeonseok Yoon

Abstract

CsPbBr3 perovskite nanocrystals with two different dimensionalities were synthesized at different temperatures and then integrated as optoelectronic transducers into transistor-type photoconversion devices. Postsynthesis transformation was observed for two-dimensional (2D) nanoplatelets, while the transformation was rarely found in 3D nanocubes. At ambient temperature and pressure, neighboring nanoplatelets made facet-to-facet contact and then fused into larger 2D nanoplatelets (2-5 times) without defects. The coalescence of 2D nanoplatelets at the ambient condition lowered the density of defects at the surface of the nanocrystals and thus could facilitate effective and stable photoconversion behavior in the nanocrystal film integrated into the device. Consequently, the ambient-condition aging of 2D nanoplatelets on device substrate led to 3 times higher retention in photoconversion performance. Importantly, these results provide a new concept of how perovskite nanocrystals can be integrated into a device for enhanced stability in device performance.

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Jan 9, 2020·Journal of Colloid and Interface Science·Thanh-Hai LeHyeonseok Yoon
Feb 25, 2020·The Journal of Physical Chemistry Letters·Junfu LengZhi-Kuang Tan
Apr 23, 2020·The Journal of Physical Chemistry Letters·Gopal Krishnamurthy GrandhiWon Bin Im
Sep 18, 2020·The Journal of Physical Chemistry Letters·Lin ZhuNana Wang
Dec 12, 2020·The Journal of Physical Chemistry Letters·Adedayo M Sanni, Aaron S Rury

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