Origin of the anisotropic-strain-driven photoresponse enhancement in inorganic halide-based self-powered flexible photodetectors

Da Bin Kim; Ju Han; Ye Seul Jung; Kwan Sik Park; Youngseo Park; Junseok Heo; Yong Soo Cho

doi:10.1039/d1mh02055b

Origin of the anisotropic-strain-driven photoresponse enhancement in inorganic halide-based self-powered flexible photodetectors

Da Bin Kim, Ju Han, Ye Seul Jung, Kwan Sik Park, Youngseo Park, Junseok Heo, Yong Soo Cho

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Strain engineering has been recognized as a critical strategy in modulating the optoelectronic properties of perovskite halide materials. Here, we demonstrate a self-powered, flexible photodetector based on CsPbBr₃ thin films with controllable compressive or tensile strain of up to ±0.81%, which was produced in situ via a sequential two-step deposition on bent polymer substrates. The best photoresponsivity of ∼121.5 mA W⁻¹ with a photocurrent of 5.15 μA was achieved at zero bias under a power intensity of 0.47 mW cm⁻² for the maximum tensile strain of +0.81%, which corresponds to a ∼100.2% increase relative to that of the unstrained case. The in situ tensile strain adjusted the band alignments, making them favorable for enhanced charge transport and thus a higher photoresponse. The structural origin of this superlative balanced photodetection performance was systematically revealed to be associated with the distortion of coupled PbBr₆ octahedra and the atomic displacement within the octahedron.

Original language	English
Pages (from-to)	1207-1215
Number of pages	9
Journal	Materials Horizons
Volume	9
Issue number	4
DOIs	https://doi.org/10.1039/d1mh02055b
Publication status	Published - 2022 Feb 26

Bibliographical note

Funding Information:
This work was financially supported by grants from the National Research Foundation of Korea (NRF-2021R1A2C2013501), the Creative Materials Discovery Program by the Ministry of Science and ICT (2018M3D1A1058536), and the Graduate School of 2020 Yonsei University Research Scholarship Grants.

Publisher Copyright:
© 2022 The Royal Society of Chemistry

All Science Journal Classification (ASJC) codes

Materials Science(all)
Mechanics of Materials
Process Chemistry and Technology
Electrical and Electronic Engineering

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title = "Origin of the anisotropic-strain-driven photoresponse enhancement in inorganic halide-based self-powered flexible photodetectors",

abstract = "Strain engineering has been recognized as a critical strategy in modulating the optoelectronic properties of perovskite halide materials. Here, we demonstrate a self-powered, flexible photodetector based on CsPbBr3 thin films with controllable compressive or tensile strain of up to ±0.81%, which was produced in situ via a sequential two-step deposition on bent polymer substrates. The best photoresponsivity of ∼121.5 mA W−1 with a photocurrent of 5.15 μA was achieved at zero bias under a power intensity of 0.47 mW cm−2 for the maximum tensile strain of +0.81%, which corresponds to a ∼100.2% increase relative to that of the unstrained case. The in situ tensile strain adjusted the band alignments, making them favorable for enhanced charge transport and thus a higher photoresponse. The structural origin of this superlative balanced photodetection performance was systematically revealed to be associated with the distortion of coupled PbBr6 octahedra and the atomic displacement within the octahedron.",

author = "Kim, {Da Bin} and Ju Han and Jung, {Ye Seul} and Park, {Kwan Sik} and Youngseo Park and Junseok Heo and Cho, {Yong Soo}",

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AU - Jung, Ye Seul

AU - Park, Kwan Sik

AU - Park, Youngseo

AU - Heo, Junseok

AU - Cho, Yong Soo

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PY - 2022/2/26

Y1 - 2022/2/26

N2 - Strain engineering has been recognized as a critical strategy in modulating the optoelectronic properties of perovskite halide materials. Here, we demonstrate a self-powered, flexible photodetector based on CsPbBr3 thin films with controllable compressive or tensile strain of up to ±0.81%, which was produced in situ via a sequential two-step deposition on bent polymer substrates. The best photoresponsivity of ∼121.5 mA W−1 with a photocurrent of 5.15 μA was achieved at zero bias under a power intensity of 0.47 mW cm−2 for the maximum tensile strain of +0.81%, which corresponds to a ∼100.2% increase relative to that of the unstrained case. The in situ tensile strain adjusted the band alignments, making them favorable for enhanced charge transport and thus a higher photoresponse. The structural origin of this superlative balanced photodetection performance was systematically revealed to be associated with the distortion of coupled PbBr6 octahedra and the atomic displacement within the octahedron.

AB - Strain engineering has been recognized as a critical strategy in modulating the optoelectronic properties of perovskite halide materials. Here, we demonstrate a self-powered, flexible photodetector based on CsPbBr3 thin films with controllable compressive or tensile strain of up to ±0.81%, which was produced in situ via a sequential two-step deposition on bent polymer substrates. The best photoresponsivity of ∼121.5 mA W−1 with a photocurrent of 5.15 μA was achieved at zero bias under a power intensity of 0.47 mW cm−2 for the maximum tensile strain of +0.81%, which corresponds to a ∼100.2% increase relative to that of the unstrained case. The in situ tensile strain adjusted the band alignments, making them favorable for enhanced charge transport and thus a higher photoresponse. The structural origin of this superlative balanced photodetection performance was systematically revealed to be associated with the distortion of coupled PbBr6 octahedra and the atomic displacement within the octahedron.

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Origin of the anisotropic-strain-driven photoresponse enhancement in inorganic halide-based self-powered flexible photodetectors

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