Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202305310
Keywords
Halide Perovskite; Photodetection; Photoferroelectric Solid Solution; Pyroelectricity; Solid Solution Bulk Crystal
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A homogeneous solid solution of halide perovskite photoferroelectric PA(2)FA(x)MA(1-x)Pb(2)Br(7) has been developed, demonstrating tunable Curie temperature and excellent optoelectrical features. By adjusting the component to x=0.7, the crystal shows ultrahigh pyroelectric coefficient and achieves a self-powered and sensitive photodetector with boosted responsivity and detectivity.
Photoferroelectrics, especially emerging halide perovskite ferroelectrics, have motivated tremendous interests owing to their fascinating bulk photovoltaic effect (BPVE) and cross-coupled functionalities. However, solid solutions of halide perovskite photoferroelectrics with controllable structure and enhanced performance are scarcely explored. Herein, through mixing cage cation, a homogeneous halide perovskite photoferroelectric PA(2)FA(x)MA(1-x)Pb(2)Br(7) solid solution (PA, FA and MA are CH3CH2CH2NH3+, NH2CHNH2+ and CH3NH3+, 0 & LE;x & LE;1) has been developed, which demonstrates tunable Curie temperature in a wide range of 263-323 K and excellent optoelectrical features. As the component adjusted to x=0.7, the bulk crystal demonstrates ultrahigh pyroelectric coefficient up to 1.48 & mu;C cm(-2) K-1 around room temperature. Strikingly, benefiting from the light-induced pyroelectricity and remarkable BPVE, a self-powered and sensitive photodetector based solid solution crystals with boosted responsivity and detectivity over than 1300 % has been achieved. This pioneering work sheds light on the exploration of photoferroelectric solid solutions towards high-performance photoelectronic devices.
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