Large-gain low-voltage and wideband organic photodetectors via unbalanced charge transport,Materials Horizons

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Large-gain low-voltage and wideband organic photodetectors via unbalanced charge transport
Materials Horizons ( IF 12.2 ) Pub Date : 2020-10-08 , DOI: 10.1039/d0mh01445a
Jianfei Huang _{1,

2,

3,

4,

5} , Jaewon Lee _{6,

7,

8,

9} , Max Schrock _{1,

2,

3,

4} , Alana L. Dixon _{1,

2,

3,

4} , Alexander T. Lill _{1,

2,

3,

4} , Kilwon Cho _{9,

10,

11,

12,

13} , Guillermo C. Bazan _{2,

4,

5,

14,

15} , Thuc-Quyen Nguyen _{1,

2,

3,

4,

5}

Affiliation

Gain photodetectors offer large photoresponse towards small optical signals. Despite having achieved high external quantum efficiency (EQE), current gain organic photodetectors (OPDs) generally suffer from narrow spectral sensitivity, slow response time and/or large operating voltage for achieving a favorable gain. So far, strategies tackling one of these issues have often meant sacrificing another parameter. Here, we present solution-processed all-rounder gain OPDs simultaneously featuring broadband activity (300–1200 nm), low-voltage operation and a fast response speed applicable in real-time heath monitoring. A systematic study shows that the gain mechanism stems from adding a small quantity of tetracyanoquinodimethane (TCNQ), which leads to unbalanced charge transport between holes and electrons. The strategy is also transferrable to other organic bulk heterojunction systems, indicating its promising versatility for further exploration.

中文翻译：

通过不平衡电荷传输的大增益低压宽带有机光电探测器

增益光电探测器可对小光信号提供较大的光响应。尽管已经实现了高外部量子效率（EQE），但是电流增益有机光电探测器（OPD）通常遭受光谱灵敏度窄，响应时间慢和/或用于获得良好增益的较大工作电压的困扰。到目前为止，解决这些问题之一的策略通常意味着牺牲另一个参数。在这里，我们展示了经过解决方案处理的全能增益OPD，同时具有宽带活动（300–1200 nm），低压运行和适用于实时健康监测的快速响应速度。一项系统的研究表明，增益机制源于添加少量的四氰基喹二甲烷（TCNQ），这会导致空穴与电子之间的电荷传输不平衡。

更新日期：2020-11-03

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