{"cited_by_count":132725,"description":"This cluster of papers focuses on the development and optimization of high-efficiency photocathodes for electron sources, with a particular emphasis on materials such as GaN and GaAs. The research covers topics such as quantum efficiency, negative electron affinity, surface photovoltage, microchannel plates, spin polarization, and the application of these photocathodes in ultraviolet detectors.","display_name":"Photocathodes and Microchannel Plates","domain_id":"3","external_ids":{"openalex":"https://openalex.org/T13418","wikipedia":"https://en.wikipedia.org/wiki/Photocathode"},"field_id":"22","id":"T13418","keywords":[{"display_name":"photocathodes","id":"photocathodes","score":0.3201,"url":"https://openalex.org/keywords/photocathodes"},{"display_name":"microchannel plates","id":"microchannel-plate","score":0.5073,"url":"https://openalex.org/keywords/microchannel-plate"},{"display_name":"negative electron affinity","id":"negative-electron-affinity","score":0.6069,"url":"https://openalex.org/keywords/negative-electron-affinity"},{"display_name":"GaAs photocathode","id":"gaas-photocathode","score":0.7888,"url":"https://openalex.org/keywords/gaas-photocathode"},{"display_name":"microchannel plate detector","id":"microchannel-plate-detector","score":0.2545,"url":"https://openalex.org/keywords/microchannel-plate-detector"},{"display_name":"cold cathode","id":"cold-cathode","score":0.2103,"url":"https://openalex.org/keywords/cold-cathode"},{"display_name":"field emitter arrays","id":"field-emitter-arrays","score":0.2016,"url":"https://openalex.org/keywords/field-emitter-arrays"},{"display_name":"electron multiplier","id":"electron-multiplier","score":0.3162,"url":"https://openalex.org/keywords/electron-multiplier"},{"display_name":"photocathode lifetime","id":"photocathode-lifetime","score":0.7959,"url":"https://openalex.org/keywords/photocathode-lifetime"},{"display_name":"photocathode materials","id":"photocathode-materials","score":0.6584,"url":"https://openalex.org/keywords/photocathode-materials"},{"display_name":"multialkali photocathodes","id":"multialkali-photocathodes","score":0.7241,"url":"https://openalex.org/keywords/multialkali-photocathodes"},{"display_name":"negative electron affinity photocathodes","id":"negative-electron-affinity-photocathodes","score":0.9111,"url":"https://openalex.org/keywords/negative-electron-affinity-photocathodes"},{"display_name":"microchannel plate photomultiplier","id":"microchannel-plate-photomultiplier-tubes","score":0.2226,"url":"https://openalex.org/keywords/microchannel-plate-photomultiplier-tubes"},{"display_name":"CsI photocathode","id":"csi-photocathode","score":0.2827,"url":"https://openalex.org/keywords/csi-photocathode"},{"display_name":"cesium activation","id":"cesium-activation","score":0.8999,"url":"https://openalex.org/keywords/cesium-activation"},{"display_name":"polarized electron source","id":"polarized-electron-source","score":0.2969,"url":"https://openalex.org/keywords/polarized-electron-source"},{"display_name":"semiconductor photocathodes","id":"semiconductor-photocathodes","score":0.6894,"url":"https://openalex.org/keywords/semiconductor-photocathodes"},{"display_name":"channel electron multiplier","id":"channel-electron-multiplier","score":0.3764,"url":"https://openalex.org/keywords/channel-electron-multiplier"},{"display_name":"GaN photocathode","id":"gan-photocathode","score":0.9303,"url":"https://openalex.org/keywords/gan-photocathode"},{"display_name":"photocathode stability","id":"photocathode-stability","score":0.435,"url":"https://openalex.org/keywords/photocathode-stability"},{"display_name":"image tubes","id":"image-tubes","score":0.2006,"url":"https://openalex.org/keywords/image-tubes"},{"display_name":"transmission-mode photocathode","id":"transmission-mode-photocathodes","score":0.9743,"url":"https://openalex.org/keywords/transmission-mode-photocathodes"},{"display_name":"cesium telluride","id":"cesium-telluride","score":0.5032,"url":"https://openalex.org/keywords/cesium-telluride"},{"display_name":"electron beam brightness","id":"electron-beam-brightness","score":0.2354,"url":"https://openalex.org/keywords/electron-beam-brightness"},{"display_name":"silicon field emitters","id":"silicon-field-emitters","score":0.34,"url":"https://openalex.org/keywords/silicon-field-emitters"}],"legacy_keywords":["Photocathodes","Electron Sources","Quantum Efficiency","Negative Electron Affinity","GaN","GaAs","Surface Photovoltage","Microchannel Plates","Spin Polarization","Ultraviolet Detectors"],"openalex_id":"https://openalex.org/T13418","source_created_date":"2024-01-23T15:27:18","source_updated_date":"2026-10-17T03:02:00","subfield_id":"2204","url":"/topics/T13418","works_api_url":"https://api.openalex.org/works?filter=topics.id:T13418","works_count":18867,"label":"Photocathodes and Microchannel Plates","provider":"openalex","revision":"ac9568d79a494346","taxonomy_revision":"f050b5d4780b1289","title":"Photocathodes and Microchannel Plates","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"38359762886641329","address_version":"morton4x16-v1","coordinates":[3,22,2204,13418],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}