{"id":224547,"date":"2025-11-05T05:29:58","date_gmt":"2025-11-05T11:29:58","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2025\/11\/optimizing-avalanche-photodiode-design-for-photodetection-in-the-ultraviolet-wavelength"},"modified":"2025-11-05T05:29:58","modified_gmt":"2025-11-05T11:29:58","slug":"optimizing-avalanche-photodiode-design-for-photodetection-in-the-ultraviolet-wavelength","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2025\/11\/optimizing-avalanche-photodiode-design-for-photodetection-in-the-ultraviolet-wavelength","title":{"rendered":"Optimizing avalanche photodiode design for photodetection in the ultraviolet wavelength"},"content":{"rendered":"<p><a class=\"aligncenter blog-photo\" href=\"https:\/\/lifeboat.com\/blog.images\/optimizing-avalanche-photodiode-design-for-photodetection-in-the-ultraviolet-wavelength.jpg\"><\/a><\/p>\n<p>Geiger-mode avalanche photodiodes (GM-APDs) are highly sensitive light detectors, capable of detecting single photons. Photons of certain wavelengths, when absorbed by photodiodes, generate electron-hole pairs in a process called impact ionization which can result in a multiplication of charges when occurring in an electric field.<\/p>\n<p>An avalanche photodiode is biased above its \u201c<a href=\"https:\/\/phys.org\/tags\/breakdown+voltage\/\" rel=\"tag\" class=\"\">breakdown voltage<\/a>,\u201d at which point impact ionizations reach a self-sustaining rate, resulting in a distinct electrical pulse that is readily detectable. To detect <a href=\"https:\/\/phys.org\/tags\/single+photons\/\" rel=\"tag\" class=\"\">single photons<\/a> in the presence of other mechanisms that generate impact ionization, the avalanche diode must simultaneously have a high probability to absorb incident photons of the desired wavelength, known as the unity-gain quantum efficiency (QE). Both being able to support high fields and having good QE at the desired wavelength are critical factors in determining the device\u2019s sensitivity.<\/p>\n<p>Certain GM-APDs based on 4H-silicon carbide (4H-SiC) have high single-photon detection efficiency in the deep-ultraviolet (DUV) wavelengths around 280 nanometers. To reliably detect photons at higher wavelengths where absorption is weaker, SiC GM-APDs need to improve their baseline photon capture efficiency, as indicated by its unity-gain QE. To accomplish this, researchers often employ APDs with much thicker absorber layers. However, this can often lead to design challenges.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Geiger-mode avalanche photodiodes (GM-APDs) are highly sensitive light detectors, capable of detecting single photons. Photons of certain wavelengths, when absorbed by photodiodes, generate electron-hole pairs in a process called impact ionization which can result in a multiplication of charges when occurring in an electric field. An avalanche photodiode is biased above its \u201cbreakdown voltage,\u201d at [\u2026]<\/p>\n","protected":false},"author":427,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1523,1617],"tags":[],"class_list":["post-224547","post","type-post","status-publish","format-standard","hentry","category-computing","category-quantum-physics"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/224547","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/427"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=224547"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/224547\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=224547"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=224547"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=224547"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}