Synaptic　devices　of　optoelectronic　nature,　which　combine　light-detection　and　data-storage　capabilities,　hold　significant　promise　in　the　realm　of　neuromorphic　computing.　They　are　especially　beneficial　for　the　processing　of　visual　data　and　the　execution　of　intricate　cognitive　functions　akin　to　learning,　memory　retention,　and　logical　reasoning.　However,　current　research　is　mostly　confined　to　the　level　of　individual　devices,　with　corresponding　studies　on　synaptic　arrays　being　relatively　scarce.　Type　II　heterojunctions　are　widely　used　in　optoelectronics.　Bandgap　engineering　enables　efficient　separation　and　trapping　of　photogenerated　excitons　in　selected　materials,　reducing　carrier　recombination.　This　prolongs　carrier　retention　in　the　channel,　delaying　photocurrent　decay,　crucial　for　artificial　optoelectronic　synapses.　We　designed　an　organic　nanowire/perovskite　Type　II　heterojunction　where　CsPbBr3　perovskite　films　and　TIPS　nanowires　serve　as　the　photosensitive　and　channel　layers,　respectively.　The　composite　synaptic　array　was　successfully　fabricated　by　in-situ　growth　of　TIPS　nanowires　on　the　surface　of　perovskite　thin　films.　It　was　further　used　to　fabricate　a　photonic　synapse　array　that　exhibits　characteristic　photocurrent　and　stable　optical　response.　Achieving　high-performance　photonic　synapses　was　facilitated　by　characteristics　such　as　high　mobility　and　high　on/off　ratios,　stemming　from　the　formation　of　complete　single-crystal　nanowires　on　the　perovskite　films.　Exhibiting　synaptic　behaviors　such　as　photo-induced　enhancements　and　paired-pulse　facilitation,　the　device　enabled　a　visual　sensing　system　with　a　5　×　5　pixel　array　for　simulating　memory　processes　and　restoring　associative　memories.　A　novel　photocurrent　model　was　established　for　understanding　device　characteristics.　This　work　provides　valuable　insights　for　future　utilization　of　composite　organic　nanowire　arrays　in　simulating　brain-like　computations　and　realizing　large-scale　intelligent　visual　sensing　systems.　©　2024　Elsevier　B.V.