GaSb / AlAsSb 'cais tawm thiab kev sib txig sib npaug' photodiodes (SAM-APDs) tuaj yeem siv los xaiv cov kev siv hluav taws xob xoo hluav taws xob thiab xiam hluav taws xob, raws li University of California, Los Angeles.
Cov pab pawg neeg tshawb fawb tau teeb tsa xws li cov duab xoo hluav taws xob thiab gamma-duab-peaks los ntawm americium 241 qhov chaw (1.55GBq) ntawm 59.5keV nrog tag nrho dav dav ib nrab-qhov siab tshaj 1.283keV.
Hauv SAM-APDs, lub teeb / hluav taws xob absorbing txheej yog cais tawm ntawm cov qhwv ntsej muag pn loj loj uas ua kom muaj kev sib koom ua kom pom tseeb, cia siab rau qhov av siab tau nce nrog tsawg tsawg ziag no.
"Peb tus qauv SAM yog ib qho zoo vim nws muab cov txiaj ntsim zoo dua-piv-nrov rau ntawm qhov nce," hais tias UCLA tshawb nrhiav Dr Dingkun Ren. "Qhov no tseem ceeb heev kom daws cov teeb meem hluav taws xob. Peb lub ntsuas yog cov thawj SAM-APDs los qhia cov npe tseeb ntawm gamma-rays> 50keV. "
Kev xaiv cov khoom siv semiconductor tseem ceeb.
"Peb siv GaSb siv Si, Ge los yog GaAs los ua kom thaj chaw nyob," hais ua qhov project Dr Bor-Chau Juang. "Qhov no yog vim tias GaSb tuaj yeem muab cov kev ua kom zoo dua qub thiab muab ntau dua qhov ua kom tsis txhob muaj cov fais fab loj vim yog nws tus lej tsawg dua."
Tus absorber GaSb yog khub nrog AlAsSb avalanche hlawv - cov heterostructures zus siv molecular beam epitaxy.
"Tus GaSb / AlAsSb heterostructure muaj ntau qhov kev sib txawv hauv ob leeg khub tsim hluav taws xob thiab kev ua haujlwm zoo. Qhov no yuav pab rau kev tshem tawm lub suab nrov ntawm cov duab-peaks uas tsim tawm sab nraud ntawm cov cheeb tsam Gigoric Ges ".
Cov hauj lwm tau raug luam tawm hauv Cov Khoom Siv Heev Zoo Siab Siv ua ' Energy-sensitive GaSb / AlAsSb cais kev nqus thiab kev sib txig sib npaug rau cov duab xoo hluav taws xob thiab gamma-ray nrhiav '.
Raws li nws cov paub daws teeb: "Spectroscopic characterisations qhia tau hais tias kev txhim kho ntawm kev ntsuas lub zog vim kev txo cov kab hluav taws xob tsawg zog hauv cov absorbers thiab suppressed non-radiative recombination ntawm cov chaw. Cov SAM-APDs tuaj yeem pom cov lus teb muaj zog txog li ntawm 59.5 keV. "
Cov kev ua tau zoo yuav zoo dua, raws li nws tau xav tias cov suab nrov ntawm cov ntawv nyeem tawm electronics yog qhov kev ntsuam xyuas.
Pab pawg UCLA nrhiav cov neeg koom tes nrog rau qhov yuav tsum tau pom thiab paub qhov sib txawv ntawm cov hluav taws xob, qhia tawm tias lwm yam kev ntsuas hluav taws xob siv los siv rau kev kuaj, tshuaj thiab kev ruaj ntseg.
