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However, achieving both fast response and high-sensitivity simultaneously in a single bipolar photodetector remains a challenge. In this study, we present a self-powered photodetector based on a MoS2\/SnBi2Te4 unipolar barrier van der Waals heterojunction, which exhibits a wavelength-dependent bipolar photoresponse. This unique behavior arises from the switching dominance of the two materials in the device photoresponse at different wavelengths. The device demonstrates a negative photoresponse in the wavelength range of 532\u2013808 nm, achieving a noise equivalent power (NEP) as low as 3.35 \u00d7 10\u201315 W\u00b7Hz\u20131\/2 at 635 nm, along with an impressive specific detectivity (D*) of 1.26 \u00d7 1011 Jones. Notably, it exhibits a positive photoresponse among the wavelengths of 980\u20131250 nm, with an NEP value of 3.06 \u00d7 10\u201314 W\u00b7Hz\u20131\/2 and a D* of 1.38 \u00d7 1010 Jones at 980 nm. Furthermore, we demonstrate the potential application of this detector in ternary optical logic devices. Additionally, the unipolar barrier band structure effectively suppresses carrier recombination, while the built-in electric field facilitates rapid charge separation. As a result, the device achieves an ultralow dark current and fast response speeds, with a rise time of 2.3 \u03bcs and a fall time of 4.2 \u03bcs. This study offers innovative material architectures and design strategies for constructing self-powered bipolar photodetectors with high sensitivity.<\/jats:p>","DOI":"10.1021\/acsami.6c10312","type":"journal-article","created":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T09:02:29Z","timestamp":1788944549000},"page":"52530-52542","source":"Crossref","is-referenced-by-count":0,"title":["Self-Powered Bipolar Response Photodetector Based on MoS2\/SnBi2Te4 Heterojunction"],"prefix":"10.1021","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-7837-2214","authenticated-orcid":true,"given":"Yurun","family":"Qu","sequence":"first","affiliation":[{"name":"Shanghai Maritime University , , ,","place":["Shanghai, P. R. China, 201306"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chengyu","family":"Leng","sequence":"additional","affiliation":[{"name":"Shanghai University , , ,","place":["Shanghai, P. R. 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