近日德國埃爾朗根-紐倫堡大學(xué)研究團(tuán)隊(duì)于物理化學(xué)快報(bào)期刊上發(fā)表了一篇關(guān)于CsPbBr3單晶表面、體電流和離子空間電荷效應(yīng)的研究文章(https://pubs.acs.org/doi/10.1021/acs.jpclett.2c00804#)。CsPbBr3單晶在電離輻射領(lǐng)域具有廣闊的應(yīng)用前景由于其最佳光電性能的檢測(cè)器件。然而,它們的混合離子?電子導(dǎo)電性產(chǎn)生不穩(wěn)定性和遲滯偽象,阻礙了器件的長期運(yùn)行。這篇文章中作者報(bào)告了CsPbBr3單晶的電特性,其工作時(shí)間可達(dá)數(shù)小時(shí)??焖亠w行時(shí)間測(cè)量顯示遷移率為13-26 cm2 V-1 s-1,電壓偏置為負(fù)。電流瞬變和阻抗譜實(shí)驗(yàn)表明了幾種空間電荷限制電流(SCLC)的形成。與類似于普爾-弗倫克爾電離陷阱輔助輸運(yùn)的機(jī)制有關(guān)。作者認(rèn)為,離子-SCLC似乎是這種鹵化鉛鈣鈦礦的一種運(yùn)行模式,盡管事實(shí)是可以在實(shí)驗(yàn)設(shè)計(jì)中移動(dòng)離子對(duì)輸運(yùn)的貢獻(xiàn)可以忽略不計(jì)。
韓國NEXTRON公司帕爾貼變溫微探針系統(tǒng)MPS-PT(-40℃-200℃)為文章中電流瞬變和阻抗譜實(shí)驗(yàn)提供了精準(zhǔn)的溫度環(huán)境及變溫條件,確保了實(shí)驗(yàn)數(shù)據(jù)的可靠性及準(zhǔn)確性。(For the measurement of dark continuous current (DC)
mode J?V curves, a Keithley 236 was utilized at room conditions. Several protocols of impedance spectroscopy (IS)characterizations were used in this work by means of a bipotentiostat PGSTAT302N-FRA32M, from Metrohm His- pania AUTOLAB. The alternating current (AC) mode voltage perturbation was 150 mV. The GR connection was via an AUTOLAB’s BA unit, which provides a second working electrode. The temperature was controlled with a microprobe system with a Peltier device heating and a cooling sample stage, from Nextron.)
帕爾貼變溫微探針系統(tǒng)的基本參數(shù)如下:
溫度范圍:-40℃ – 200℃
加熱方式:帕爾貼變溫
樣品臺(tái)尺寸:19 X 19mm
探針數(shù)量:4/6/8個(gè)可選
測(cè)試環(huán)境:氣氛、真空、濕度、光照
探針移動(dòng)方式:手動(dòng)/壓電驅(qū)動(dòng)
還可以根據(jù)實(shí)驗(yàn)需求進(jìn)行特殊定制
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