Understanding and Countering Illumination-Sensitive Dark Current: Toward Organic Photodetectors with Reliable High Detectivity
Understanding and Countering Illumination-Sensitive Dark Current: Toward Organic Photodetectors with Reliable High Detectivity
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DOI：
10.1021/acsnano.0c09426
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发表时间：
2021-01-13
期刊：
影响因子：
17.1
通讯作者：
Nguyen, Thuc-Quyen
中科院分区：
文献类型：
--
作者：
Huang, Jianfei;Lee, Jaewon;Nguyen, Thuc-Quyen
不断增强的光响应性和抑制暗/噪声电流coinbinatorially导致最近开发的高探测率的有机光电探测器与宽带传感能力。尽管取得了这些成就，但由有机光电探测器（OPD）实现的可靠光敏仍然面临挑战。在此，我们呼吁注意在高性能倒置OPD中暗电流对照明历史的有害敏感性的普遍现象。这种现象，不利于实现高灵敏度和一致的数字的优点，显示从曝光的OPD中常用的电子传输层的高能量光子和其随之而来的损失的电荷选择性通过系统的研究。为了解决这个普遍存在的问题，“双层”氧化锡作为替代的电子传输层被证明，这不仅消除了初始和照射后的暗电流特性之间的不一致性，而且保持了暗电流的低幅度，良好的外量子效率，和快速的瞬态响应。
Continuously enhanced photoresponsivity and suppressed dark/noise current coinbinatorially lead to the recent development of high-detectivity organic photodetectors with broadband sensing competence. Despite the achievements, reliable photosensing enabled by organic photodetectors (OPDs) still faces challenges. Herein, we call for heed over a universal phenomenon of detrimental sensitivity of dark current to illumination history in high-performance inverted OPDs. The phenomenon, unfavorable to the attainment of high sensitivity and consistent figures-of-merit, is shown to arise from exposure of the commonly used electron transport layer in OPDs to high-energy photons and its consequent loss of charge selectivity via systematic studies. To solve this universal problem, "double" layer tin oxide as an alternative electron transport layer is demonstrated, which not only eliminates the inconsistency between the initial and after-illumination dark current characteristics but also preserves the low magnitude of dark current, good external quantum efficiency, and rapid transient response.