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Title: Capillary-bridge controlled patterning of stable double-perovskite microwire arrays for non-toxic photodetectors
Authors: Pi, Yueyang
Zhao, Jinjin
Zhao, Yingjie
Feng, Jiangang
Zhang, Chi
Gao, Hanfei
Wu, Yuchen
Jiang, Lei
Keywords: Science::Chemistry
Issue Date: 2020
Source: Pi, Y., Zhao, J., Zhao, Y., Feng, J., Zhang, C., Gao, H., . . . Jiang, L. (2020). Capillary-bridge controlled patterning of stable double-perovskite microwire arrays for non-toxic photodetectors. Frontiers in Chemistry, 8, 632-. doi:10.3389/fchem.2020.00632
Journal: Frontiers in Chemistry
Abstract: Single-crystalline lead halide perovskites with remarkable physical properties offer great potential in integrated optoelectronic applications but are restricted by their instability and toxicity. To address these problems, various strategies including lead-free halide double perovskites with high stabilities of heat, light, and moisture have been developed. However, it still requires an efficient method to pattern single-crystalline, double-perovskite micro-/nanostructures with strict alignment and ordered orientation for the integration of optoelectronic devices. Here, our solution-processing approach employs capillary bridges to control the dewetting dynamics and confine the crystallization in the assembly of non-toxic Cs2AgBiBr6 microwire arrays. We demonstrate the strict alignment, high crystallinity, eliminated grain boundary, and ordered orientation of these as-prepared single-crystalline, double-perovskite microwire arrays. Based on these high-quality microwire arrays, we fabricate high-performance photodetectors with a responsivity of 1,625 A W−1, on/off ratio of 104, and fast response speed of τdecay = 0.04 ms and τrise = 0.28 ms. The long-term crystallographic and spectroscopic stability of Cs2AgBiBr6 microwire arrays has also been demonstrated through the 1 month exposure to air conditioning. Our strategy provides a new perception to fabricate stable perovskite microarrays for the integration of non-toxic optoelectronic devices.
ISSN: 2296-2646
DOI: 10.3389/fchem.2020.00632
Schools: School of Physical and Mathematical Sciences 
Rights: © 2020 Pi, Zhao, Zhao, Feng, Zhang, Gao, Wu and Jiang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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