{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T13:01:34Z","timestamp":1790686894591,"version":"4.1.0"},"reference-count":58,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T00:00:00Z","timestamp":1790640000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T00:00:00Z","timestamp":1790640000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Small"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Phototransistors represent promising candidates for next\u2010generation photodetectors due to their inherent signal amplification capabilities. In this study, we present a DPP\u2010DTT\/FA\n                    <jats:sub>0.9<\/jats:sub>\n                    Cs\n                    <jats:sub>0.1<\/jats:sub>\n                    PbI\n                    <jats:sub>3<\/jats:sub>\n                    bilayer phototransistor that integrates R\/G\/B\/Near\u2010infrared (NIR) photodetection alongside photo\u2010memory functionality within a single device. The DPP\u2010DTT layer serves as a stable charge transport channel and a NIR\u2010responsive semiconductor, whereas the FA\n                    <jats:sub>0.9<\/jats:sub>\n                    Cs\n                    <jats:sub>0.1<\/jats:sub>\n                    PbI\n                    <jats:sub>3<\/jats:sub>\n                    layer functions as a visible\u2010light\u2010absorbing photoactive layer. Through optimization of the perovskite precursor molarity, a concentration of 0.10\u00a0M was determined to be optimal for balancing interfacial light absorption and leakage current suppression. Under these conditions, the bilayer device exhibited photosensitivity values of 1.50 \u00d7 10\n                    <jats:sup>4<\/jats:sup>\n                    and 2.35 \u00d7 10\n                    <jats:sup>5<\/jats:sup>\n                    , photoresponsivity values of 0.12 and 2.01 A\/W, and photo detectivity values of 1.09 \u00d7 10\n                    <jats:sup>12<\/jats:sup>\n                    and 1.71 \u00d7 10\n                    <jats:sup>13<\/jats:sup>\n                    Jones under 520 and 850\u00a0nm illumination, respectively, at an intensity of 5 mW cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    . The optimized device demonstrated distinct photoresponse to illumination wavelengths of R\/G\/B\/NIR. Furthermore, the device exhibited pulse\u2010dependent photo\u2010memory characterized by a short\u2010term memory (STM) to long\u2010term memory (LTM) transition. This work establishes a compact bilayer approach for the integration of multispectral sensing and optical memory in highly integrated multifunctional photodetectors.\n                  <\/jats:p>","DOI":"10.1002\/smll.76002","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T12:40:35Z","timestamp":1790685635000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Multifunctional Organic\u2010Perovskite Bilayer Phototransistor for R\/G\/B\/NIR Broadband Detection and Photo\u2010Memory"],"prefix":"10.1002","author":[{"given":"Dong Hyun","family":"Nam","sequence":"first","affiliation":[{"name":"School of Electrical and Computer Engineering Center for Smart Sensor System of Seoul (CS4) University of Seoul  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-8331-2155","authenticated-orcid":false,"given":"Yeon\u2010Woo","family":"Choi","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering and Center for Antibonding Regulated Crystals Sungkyunkwan University (SKKU)  Suwon Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-7219-8476","authenticated-orcid":false,"given":"Jae Won","family":"Park","sequence":"additional","affiliation":[{"name":"School of Electrical and Computer Engineering Center for Smart Sensor System of Seoul (CS4) University of Seoul  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-9168-4973","authenticated-orcid":false,"given":"Yongju","family":"Lee","sequence":"additional","affiliation":[{"name":"School of Electrical and Computer Engineering Center for Smart Sensor 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