Inexpensive circuit for the measurement of capture cross section of deep level defects in semiconductors

Abstract

A simple and inexpensive circuit to facilitate the direct measurement of capture cross section, when synchronized with a deep level transient spectroscopy system, is described. It avoids the most commonly encountered problem of loading and distortion of the bias ͑trap filling͒ pulses of nanosecond duration in the capture cross-section measurement. The capacitance meter, whose internal circuitry is responsible for the distortion, is connected and disconnected from the rest of the apparatus with the help of simple and low-cost reed relay switches featuring high operating speed and low contact resistance. Sharp bias pulses as small as 30 ns can successfully be applied to the sample with no observable distortion. Finally, a representative measurement is shown to demonstrate the simplicity and high performance of the circuit.

Artificial Neural Networks Method Fitting for Deep-Level Transient Spectroscopy Signals Analysis

“…Основою для побудови алгоритмів проведення вимірювань та обчислень було взято тод використання імпульсів заповнення різної тривалості [4,11]. Зокрема для діапазону ротких імпульсів (як правило -до 500 нс), де функція заповнення рівня виражається …”

To a Question on the Determination of Charge Carriers Capture Cross Section by DLTS Method

“…Åêñïåðèìåíòàëüíèì ï³äòâåðäaeåííÿì ³ñ-íóâàííÿ òàêèõ îáëàñòåé ìîaeóòü ñëóãóâàòè ðå-çóëüòàòè äîñë³äaeåííÿ EL-öåíòðó òîãî ae òàêè GaAs, ïðèâåäåí³ ó ðîáîò³ [12] (ðèñ. 4).…”

“…Ó öüîìó âèïàäêó àíàë³ç çàëåaeíîñò³ âèñîòè ï³êó DLTS (S) â³ä äîâaeèíè çàïîâíþþ÷èõ ³ìïóëüñ³â (t p ) [3,12,13] äຠäîñèòü ïðîñòó ê³íöåâó ôîðìóëó äëÿ çíàõîäaeåííÿ σ Ðèñ. 4.…”

“…Çàëåaeí³ñòü âèñîòè ï³êó DLTS â³ä äîâaeèíè çàïîâíþþ÷èõ ³ìïóëüñ³â äëÿ äåôåêòó EL6 â n -GaAs. [12]. Íà âñòàâö³ ïðèâåäåíî ãðàô³ê çàëåaeíîñò³ (6) Ñêëàäí³ñòü ðåàë³çàö³¿ ïðèâåäåíîãî ñïîñîáó ïîâ'ÿçàíà ç àïàðàòíèì àñïåêòîì, áî ç îãëÿäó íà äîâaeèíó çàïîâíþþ÷èõ ³ìïóëüñ³â, ùî âèêîðèñ-òîâóþòüñÿ ïðè âèì³ðþâàíí³ ïåðåð³çó çàõîïëåí-íÿ íîñ³¿â, ñàìå àïàðàòíå çàáåçïå÷åííÿ ³ ìîaeå áóòè äaeåðåëîì âåëèêèõ ïîõèáîê.…”

“…Ïðîòå ºìíîñò³ ï³äêëþ÷åíèõ äî ãåíåðàòîðà ³ìïóëüñ³â äîñë³äaeóâàíîãî çðàçêà òà âèì³ðþâàëüíîãî êîëà ïðèçâîäèòü äî çãëàäaeóâàííÿ ôðîíò³â ³ìïóëüñó. ßêùî âèì³ðþâàëüíå êîëî íà ÷àñ ïîäà÷³ çàïîâ-íþþ÷îãî ³ìïóëüñó ìîaeíà â³äêëþ÷èòè â³ä çðàç-êà [12], òî îáìåaeåííÿ ùîäî ïàðàìåòð³â çðàçêà îá³éòè íåìîaeëèâî. Òîìó äëÿ ïîä³áíèõ âèì³ðþ-âàíü ïðèäàòí³ ëèøå íèçüêîºìí³ñí³ âèñîêî÷àñ-òîòí³ ñòðóêòóðè, ùî ñóòòºâî çíèaeóº óí³âåðñàëü-í³ñòü ïðèâåäåíîãî ñïîñîáó.…”