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Published on: August 23, 2012
Ultrastable Silica-Confined CsSnI3 Perovskite Nanocrystals for Noncontact Near-Infrared Light Communication and
Xinjie Jiang1,2,3, Hanyan Huang1,2,3, Kehao Wang1,2,3
1School of Materials Science and Engineering, State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou 310027, P. R. China.
Abstract:
Conventional infrared photothermal materials (IR-PTMs) face significant challenges regarding environmental stability and complex synthesis, limiting their practical applications. In this work, we report silica-confined CsSnI3 perovskite nanocrystals (CsSnI3@silica NCs) via a simple solid-state calcination method. The silica-confined structure endows CsSnI3@silica NCs with a high near-infrared (NIR) photothermal performance and environmental stability. Accelerated aging tests under high humidity, high temperature, and intense NIR irradiation demonstrate the better stability of CsSnI3@silica NCs compared to unconfined CsSnI3 powders and commercial graphene IR-PTM. A noncontact NIR light communication system is designed by combining CsSnI3@silica NC-based photothermal imaging with machine learning. This system achieves 99.7% accuracy in recognizing symbol (letters and numbers) images written by NIR light and enables robotic arm manipulation for noncontact human-robot interaction. Furthermore, incorporating these CsSnI3@silica NCs as a light-absorption layer in a sunlight-thermal-electric conversion system can enhance the output voltage by over 350% throughout a continuous six-month outdoor exposure period.
