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Existing response\u2010engineering strategies mainly operate in the wavelength or intensity domains, but often increase source\u2010side complexity, power consumption, and sensitivity to optical\u2010path fluctuations. Here we introduce a frequency\u2010centric strategy for response modulation. By combining a time\u2010integrated\u2010charge\u2010based alternating\u2010current\u2010to\u2010direct\u2010current (AC\u2013DC) mapping with continuous tuning of the built\u2010in electric fields across heterojunction regions with antagonistic photoresponses, the transfer function becomes customizable in the frequency domain. Using lead\u2010halide perovskites as a model platform, we demonstrate bipolar responses for image\u2010processing, nonlinear responses for neuromorphic activation\u2010function emulation, and selective responses for anti\u2010interference free\u2010space optical communication. The selective\u2010response device suppresses stray illumination by more than three orders of magnitude, while the transmitter can be implemented using a conventional laser diode driven by a function generator. The extension of this strategy to PbS and PbI\n                    <jats:sub>2<\/jats:sub>\n                    \u2010based systems supports its material generality, indicating a general route to photodetectors with application\u2010defined response characteristics.\n                  <\/jats:p>","DOI":"10.1002\/adma.75093","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T13:42:48Z","timestamp":1789998168000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Perovskite Photodetectors With Customizable Frequency Response"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-7235-6029","authenticated-orcid":false,"given":"Siping","family":"Yang","sequence":"first","affiliation":[{"name":"School of Physical Science and Technology Jiangsu Key Laboratory of Frontier Material Physics and Devices Suzhou Key Laboratory of Intelligent Photoelectric Perception Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Center for Energy Conversion Materials &amp; Physics (CECMP) Soochow University  Suzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-8716-701X","authenticated-orcid":false,"given":"Jiaqing","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Physical Science and Technology Jiangsu Key Laboratory of Frontier Material Physics and Devices Suzhou Key Laboratory of Intelligent Photoelectric Perception Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Center for Energy Conversion Materials &amp; Physics (CECMP) Soochow University  Suzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4046-4104","authenticated-orcid":false,"given":"Haoxuan","family":"Sun","sequence":"additional","affiliation":[{"name":"School of Physical Science and Technology Jiangsu Key Laboratory of Frontier Material Physics and Devices Suzhou Key Laboratory of Intelligent Photoelectric Perception Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Center for Energy Conversion Materials &amp; Physics (CECMP) Soochow University  Suzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-6452-9351","authenticated-orcid":false,"given":"Yicheng","family":"Zhou","sequence":"additional","affiliation":[{"name":"School of Physical Science and Technology Jiangsu Key Laboratory of Frontier Material Physics and Devices Suzhou Key Laboratory of Intelligent Photoelectric Perception Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Center for Energy Conversion Materials &amp; Physics (CECMP) Soochow University  Suzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-4335-1436","authenticated-orcid":false,"given":"Chi","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Physical Science and Technology Jiangsu Key Laboratory of Frontier Material Physics and Devices Suzhou Key Laboratory of Intelligent Photoelectric Perception Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Center for Energy Conversion Materials &amp; Physics (CECMP) Soochow University  Suzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-7933-7766","authenticated-orcid":false,"given":"Tianrun","family":"Yang","sequence":"additional","affiliation":[{"name":"School of Physical Science and Technology Jiangsu Key Laboratory of Frontier Material Physics and Devices Suzhou Key Laboratory of Intelligent Photoelectric Perception Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Center for Energy Conversion Materials &amp; Physics (CECMP) Soochow University  Suzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-2829-2217","authenticated-orcid":false,"given":"Yongrong","family":"Huang","sequence":"additional","affiliation":[{"name":"School of Physical Science and Technology Jiangsu Key Laboratory of Frontier Material Physics and Devices Suzhou Key Laboratory of Intelligent Photoelectric Perception Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Center for Energy Conversion Materials &amp; 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