Oriented Alignment of CsPbBr<sub>3</sub> Single-Crystal Arrays for Flexible X-ray Imaging
Jianglei Zhang, Jianglei Zhang, Weijun Li, Yifan Yang, Yuhong He, Zigao Tang, Haotong Wei, Junhu Zhang, Junhu Zhang, Bai Yang
Abstract
The utilization of perovskite materials in flexible optoelectronics is experiencing distinct diversification including X-ray detection applications. Here, we report the oriented alignment of cesium lead bromide (CsPbBr 3 ) single-crystal arrays on flexible polydimethylsiloxane (PDMS) substrates. By precisely confining the crystallization process within spatially delimited precursor droplets, we achieve a well-oriented crystal alignment through the spontaneous rotation of the CsPbBr 3 microcuboids. This approach allows for precise control over the microcuboid morphologies by varying the growth temperature. We design flexible X-ray detector arrays by seamlessly integrating CsPbBr 3 microcuboids with electrode arrays. The flexible X-ray detector can output a high sensitivity of 1.97 × 10 5 μC·Gy air –1 ·cm –2 and a low detection limit of 89 nGy air ·s –1 after the surface passivation process. The excellent mechanical properties, outstanding X-ray detection capabilities, and high pixel uniformity are also demonstrated in conformal X-ray imaging of curved surfaces.