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wu心love木蟲 (小有名氣)
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[求助]
為什么測(cè)光電流時(shí)在打開和關(guān)閉燈源的瞬間光電流會(huì)突然增大呢?
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| 為什么測(cè)光電流時(shí)在打開和關(guān)閉燈源的瞬間光電流會(huì)突然增大呢? 最好能給出相關(guān)文獻(xiàn),有鏈接也可以 謝謝了!! |
木蟲 (正式寫手)
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這個(gè)應(yīng)該是由載流子發(fā)生復(fù)合所致:以alpha-Fe2O3為例,瞬間開始光照時(shí)光電流會(huì)由暗電流值激增到一個(gè)較高值而后銳減至一穩(wěn)態(tài)值;瞬間停止光照時(shí),光電流會(huì)由穩(wěn)態(tài)值急降至一比暗電流還低的值,而后又回升至暗電流值;文獻(xiàn)稱呼這個(gè)叫暫態(tài)光電流“transient photocurrent”,對(duì)其解釋為:The instantaneous current when the light is switched on is a measure of the flux of holes into the surface. The subsequent decay towards the steady state current results from the capture of build-up holes in surface states inducing an electron flux associated with recombination. The cathodic current overshoot observed when the light is switched off is due to the continuing flux of electrons into the surface as holes remaining in the surface states recombine. 文獻(xiàn)出處:Cummings, C. Y.; Marken, F.; Peter, L. M.; Tahir, A. A.; Wijayantha, K. G. U. Chemical Communications 2012, 48, (14), 2027-2029. |
木蟲 (小有名氣)
木蟲 (正式寫手)
木蟲 (小有名氣)
木蟲 (正式寫手)
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這里有篇TiO2/SnO2的,里面提及到了transient photocurrent。 http://144.206.159.178/ft/637/86931/1472251.pdf |
木蟲 (小有名氣)
木蟲 (正式寫手)
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