Bidentate Ligand-Induced Oriented Transformation of CsPbBr3 Perovskite Nanocrystals into Nanowires for X-ray Photodetectors

Zhao, Chunyu; He, Zaozhen; Wangyang, Peihua; Tan, Jie; Shi, Chengyu; Pan, Aizhao; He, Ling; Liu, Yi

doi:10.1021/acsanm.2c00642

Title: Bidentate Ligand-Induced Oriented Transformation of CsPbBr₃ Perovskite Nanocrystals into Nanowires for X-ray Photodetectors

Journal Article · 28 March 2022 · ACS Applied Nano Materials

DOI: https://doi.org/10.1021/acsanm.2c00642 · OSTI ID:2328539

Zhao, Chunyu ^[1]; He, Zaozhen ^[1]; Wangyang, Peihua ^[2]; Tan, Jie ^[2]; Shi, Chengyu ^[1];

^[1];

^[3]

Xi'an Jiaotong University, Xi'an (China)
Guilin University of Electronic Technology, Guilin (China)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry

We report shape and dimensionality control by ligands is an efficient way to fabricate high-quality perovskite nanocrystals (NCs) with optoelectronic properties. Herein, to realize oriented transformations between different morphologies of CsPbBr₃nanocrystals, we conceived of the use of defects and bidentate ligands to synergistically drive the reorientation of CsPbBr3nanocrystals into CsPbBr₃nanowires (NWs). By employing aminocaproic acid as the bidentate ligand, CsPbBr₃NWs were reconstructed from the CsPbBr₃NCs (~7 nm) with 20-60 nm in width and several micrometers in length, as well as a 527 nm photoluminescence (PL) peak, 59% PL quantum yield, and 98.5 ns PL lifetime. The bidentate ligand-directed anisotropic shape evolution and growth of perovskite NWs from NCs was elucidated by transmission electronmicroscopy and PL studies. The photodetectors fabricated with the reconstructed CsPbBr₃NWs displayed a photocurrent enhancement (2.75 × 10^-11A) compared with that of the devices based on solution-synthesized NWs (2.28 × 10^-11A). The device also showed a short response time, indicating its more sensitive photoelectric response. This process provides a viable approach to engineering diverse morphologies of perovskite nanocrystals for optoelectronic applications.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China; National Key Research and Development Project

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2328539

Journal Information:: ACS Applied Nano Materials, Journal Name: ACS Applied Nano Materials Journal Issue: 10 Vol. 5; ISSN 2574-0970

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
anisotropic growth
bidentate ligands
CsPbX3 nanocrystal
nanowires
x-ray photodetector

Title: Bidentate Ligand-Induced Oriented Transformation of CsPbBr3 Perovskite Nanocrystals into Nanowires for X-ray Photodetectors

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Title: Bidentate Ligand-Induced Oriented Transformation of CsPbBr₃ Perovskite Nanocrystals into Nanowires for X-ray Photodetectors