Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

THE CHARGE CARRIER CAPTURE–EMISSION PROCESS – THE MAIN SOURCE OF THE LOW-FREQUENCY NOISE IN HOMOGENEOUS SEMICONDUCTORS
Vilius Palenskis
National Center for Physical Sciences and Technology, Faculty of Physics, Vilnius University, Saulėtekio 3, LT-10222 Vilnius, Lithuania
E-mail: vilius.palenskis@ff.vu.lt

Received 10 June 2016; revised 22 July 2016; accepted 23 September 2016

The possibility of determination of the number of localized capture centers of defects (relaxators) that cause low-frequency noise in a particular frequency range has been investigated. Here it is shown that a minimum number of relaxators is needed to generate 1/f type low-frequency noise only when relaxation times are arbitrarily distributed one-by-one in every two-octave range. The expression for estimation of the low-frequency noise level of the sample under test is presented. The presented expression for 1/f noise explains not only the noise level dependence both on the frequency and number of defects in the sample but also the observed noise intensity dependence on the mobility of free charge carriers. It is shown that the main source that causes low-frequency noise in homogeneous semiconductors is the charge carrier capture–emission process.

Keywords: low-frequency noise, capture and emission of charge carriers, defects, RTS, Lorentzian spectrum
PACS: 05.40.Ca, 07.50.Hp, 71.55.-i, 72.70.+m

KRŪVININKŲ PAGAVIMAS IR JŲ IŠLAISVINIMAS – PAGRINDINIS VIENALYČIŲ PUSLAIDININKIŲ ŽEMADAŽNIO TRIUKŠMO ŠALTINIS

Vilius Palenskis
Nacionalinis fizinių ir technologijos mokslų centras, Vilniaus universiteto Fizikos fakultetas, Vilnius, Lietuva

Atlikta detali homogeninių medžiagų žemadažnio (1/f) triukšmo analizė parodė, kad tiriamojo bandinio varžos fliuktuacijų spektrinio tankio atvirkštinis proporcingumas laisvųjų krūvininkų skaičiui bandinyje gali būti vertinamas tik kaip atvirkštinis proporcingumas bandinio tūriui. Matavimo ir skaičiavimo rezultatai rodo, kad žemadažnio triukšmo spektras vienareikšmiškai gali būti išreikštas Lorenco pavidalo spektrais, įskaitant atsitiktinai pasiskirsčiusias relaksacijų trukmes labai plačiame intervale.
Įvertintas mažiausias relaksatorių skaičius, galintis sukurti 1/f pavidalo triukšmo spektrą tam tikrame dažnių intervale. Parodyta, kad krūvininkų judrio fliuktuacijos gali pasireikšti tik kaip antrinis reiškinys, atsirandantis defektuose kintant sklaidos centrų skaičiui dėl krūvininkų pagavimo ir jų išlaisvinimo iš lokalizuotų centrų. Pateikta kiekybinė išraiška, leidžianti pagal išmatuotą žemadažnį triukšmą tam tikrame dažnių intervale įvertinti aktyvių pagavimo centrų skaičių bandinyje, lemiantį išmatuotą triukšmą.

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