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However, conventional visual signals are predominantly confined to the visible (Vis) wavelength range, which significantly restricts the potential applications of bipolar cells. Here, a germanium (Ge)\u2010based floating\u2010gate tungsten diselenide (WSe\n                    <jats:sub>2<\/jats:sub>\n                    ) phototransistor capable of mimicking broad\u2010spectrum bipolar cell functionality is proposed, which extend the utility from artificial retinal systems to advanced image processing applications. The floating gate of the phototransistor can non\u2010volatilely storage electrons\/holes, modulating the WSe\n                    <jats:sub>2<\/jats:sub>\n                    channel to exhibit bipolar characteristics. Under distinct bottom gate voltage pulse modulations, the bipolar WSe\n                    <jats:sub>2<\/jats:sub>\n                    channel interfaces with multilayer graphene (MLG) to form Schottky built\u2010in electric fields with opposing directions, enabling bipolar photoresponse under visible light illumination. Meanwhile, by leveraging the near\u2010infrared (NIR) light absorption of Ge and the photogating effect, the device demonstrates NIR bipolar photoresponse. Based on the unique dual\u2010band bipolar photoresponse characteristics of this single phototransistor, the neural biological functions of bipolar cells in the human retina are successfully emulated, and an image sharpening processing based on convolutional operation is demonstrated. This advancement significantly enhances the potential of visual bionic chips for applications in vehicles or robots.\n                  <\/jats:p>","DOI":"10.1002\/advs.202512649","type":"journal-article","created":{"date-parts":[[2025,9,19]],"date-time":"2025-09-19T19:57:18Z","timestamp":1758311838000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Ge\u2010Based Visible\u2010Infrared Bipolar Floating\u2010Gate Phototransistor for Broad\u2010Spectrum Retinal Bionics"],"prefix":"10.1002","volume":"12","author":[{"given":"Qiancui","family":"Zhang","sequence":"first","affiliation":[{"name":"Key Laboratory of Analog Integrated Circuits and Systems (Ministry of Education) School of Integrated Circuits Xidian University  Xi'an 710071 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yichi","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Analog Integrated Circuits 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