Deformation-Tailored MoS<sub>2</sub> Optoelectronics: Fold-Induced Band Reconstruction for Programmable Polarity Switching
This study proposes an innovative design strategy for molybdenum disulfide (MoS<sub>2</sub>) optoelectronic devices based on three-dimensional folded configurations. A “Z”-shaped folded MoS<sub>2</sub> device was fabricated through mechanical exfoliation combined with a pre-s...
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MDPI AG
2025-05-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/15/10/727 |
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| author | Bo Zhang Yaqian Liu Zhen Chen Xiaofang Wang |
| author_facet | Bo Zhang Yaqian Liu Zhen Chen Xiaofang Wang |
| author_sort | Bo Zhang |
| collection | DOAJ |
| description | This study proposes an innovative design strategy for molybdenum disulfide (MoS<sub>2</sub>) optoelectronic devices based on three-dimensional folded configurations. A “Z”-shaped folded MoS<sub>2</sub> device was fabricated through mechanical exfoliation combined with a pre-strain technique on elastic substrates. Experimental investigations reveal that the geometric folding deformation induces novel photocurrent response zones near folded regions beyond the Schottky junction area via band structure reconstruction, achieving triple polarity switching (negative–positive–negative–positive) of photocurrent. This breakthrough overcomes the single-polarity separation mechanism limitation in conventional planar devices. Scanning photocurrent microscopy demonstrates a 40-fold enhancement in photocurrent intensity at folded regions compared to flat areas, attributed to the optimization of carrier separation efficiency through a pn junction-like built-in electric field induced by the three-dimensional configuration. Voltage-modulation experiments show that negative bias (−150 mV) expands positive response regions, while +200 mV bias induces a global negative response, revealing a dynamic synergy between folding deformation and electric field regulation. Theoretical analysis identifies that the band bending and built-in electric field in folded regions constitutes the physical origin of multiple polarity reversals. This work establishes a design paradigm integrating “geometric deformation-band engineering” for regulating optoelectronic properties of two-dimensional materials, demonstrating significant application potential in programmable photoelectric sensing and neuromorphic devices. |
| format | Article |
| id | doaj-art-0a9d61f5950544478ddb1439cc3e8bdb |
| institution | OA Journals |
| issn | 2079-4991 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj-art-0a9d61f5950544478ddb1439cc3e8bdb2025-08-20T01:56:42ZengMDPI AGNanomaterials2079-49912025-05-01151072710.3390/nano15100727Deformation-Tailored MoS<sub>2</sub> Optoelectronics: Fold-Induced Band Reconstruction for Programmable Polarity SwitchingBo Zhang0Yaqian Liu1Zhen Chen2Xiaofang Wang3Department of Physics, Shanghai Normal University, Shanghai 200234, ChinaState Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, ChinaSchool of Microelectronics, Shanghai University, Shanghai 200444, ChinaSchool of Arts and Sciences, Shanghai Dianji University, Shanghai 201306, ChinaThis study proposes an innovative design strategy for molybdenum disulfide (MoS<sub>2</sub>) optoelectronic devices based on three-dimensional folded configurations. A “Z”-shaped folded MoS<sub>2</sub> device was fabricated through mechanical exfoliation combined with a pre-strain technique on elastic substrates. Experimental investigations reveal that the geometric folding deformation induces novel photocurrent response zones near folded regions beyond the Schottky junction area via band structure reconstruction, achieving triple polarity switching (negative–positive–negative–positive) of photocurrent. This breakthrough overcomes the single-polarity separation mechanism limitation in conventional planar devices. Scanning photocurrent microscopy demonstrates a 40-fold enhancement in photocurrent intensity at folded regions compared to flat areas, attributed to the optimization of carrier separation efficiency through a pn junction-like built-in electric field induced by the three-dimensional configuration. Voltage-modulation experiments show that negative bias (−150 mV) expands positive response regions, while +200 mV bias induces a global negative response, revealing a dynamic synergy between folding deformation and electric field regulation. Theoretical analysis identifies that the band bending and built-in electric field in folded regions constitutes the physical origin of multiple polarity reversals. This work establishes a design paradigm integrating “geometric deformation-band engineering” for regulating optoelectronic properties of two-dimensional materials, demonstrating significant application potential in programmable photoelectric sensing and neuromorphic devices.https://www.mdpi.com/2079-4991/15/10/727MoS<sub>2</sub>band structure engineeringstructure engineeringelectric field modulation |
| spellingShingle | Bo Zhang Yaqian Liu Zhen Chen Xiaofang Wang Deformation-Tailored MoS<sub>2</sub> Optoelectronics: Fold-Induced Band Reconstruction for Programmable Polarity Switching Nanomaterials MoS<sub>2</sub> band structure engineering structure engineering electric field modulation |
| title | Deformation-Tailored MoS<sub>2</sub> Optoelectronics: Fold-Induced Band Reconstruction for Programmable Polarity Switching |
| title_full | Deformation-Tailored MoS<sub>2</sub> Optoelectronics: Fold-Induced Band Reconstruction for Programmable Polarity Switching |
| title_fullStr | Deformation-Tailored MoS<sub>2</sub> Optoelectronics: Fold-Induced Band Reconstruction for Programmable Polarity Switching |
| title_full_unstemmed | Deformation-Tailored MoS<sub>2</sub> Optoelectronics: Fold-Induced Band Reconstruction for Programmable Polarity Switching |
| title_short | Deformation-Tailored MoS<sub>2</sub> Optoelectronics: Fold-Induced Band Reconstruction for Programmable Polarity Switching |
| title_sort | deformation tailored mos sub 2 sub optoelectronics fold induced band reconstruction for programmable polarity switching |
| topic | MoS<sub>2</sub> band structure engineering structure engineering electric field modulation |
| url | https://www.mdpi.com/2079-4991/15/10/727 |
| work_keys_str_mv | AT bozhang deformationtailoredmossub2suboptoelectronicsfoldinducedbandreconstructionforprogrammablepolarityswitching AT yaqianliu deformationtailoredmossub2suboptoelectronicsfoldinducedbandreconstructionforprogrammablepolarityswitching AT zhenchen deformationtailoredmossub2suboptoelectronicsfoldinducedbandreconstructionforprogrammablepolarityswitching AT xiaofangwang deformationtailoredmossub2suboptoelectronicsfoldinducedbandreconstructionforprogrammablepolarityswitching |