期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 31, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202102087
关键词
charge trapping; core– shell quantum dots; organic photodetectors; photomultiplication; response speed
类别
资金
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT, Korea [2020R1A2C3004477]
- National Research Foundation of Korea [2020R1A2C3004477] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A novel photomultiplication-type organic photodiode with fast response and high bandwidth is demonstrated by introducing quantum dots as a photomultiplication-inducing interlayer. The response speed of the device is closely related to the charge trapping/detrapping dynamics of the quantum dots, offering a new concept in the design of fast-responding photomultiplication-type organic photodiodes and comprehensive understanding of the underlying device physics.
A novel photomultiplication (PM)-type organic photodiode (OPD) that responds much faster (109 kHz bandwidth) than conventional PM-type OPDs is demonstrated. This fast response is achieved by introducing quantum dots (QDs) as a PM-inducing interlayer at the interface between the electrode and the photoactive layer. When the device is illuminated, the photogenerated electrons within the photoactive layer are rapidly transferred and trapped in the trap states of the QD interlayer. The electron trapping subsequently leads to charging of the QD and a consequent shift of the QD energy levels, thereby inducing hole injection from the electrode. This PM mechanism is distinct from that of conventional PM-type OPDs, whose PM usually requires a long time to induce hole (or electron) injection because of the slow transport and accumulation of electrons (or holes) within the photoactive layer. Because of its PM mechanism, the proposed QD-interlayer PM-type OPD achieves high bandwidth and high specific detectivity. In addition, it is demonstrated that the response speed of the proposed device is closely related to the charge trapping/detrapping dynamics of the QDs. This work not only offers a new concept in the design of fast-responding PM-type OPDs but also provides comprehensive understanding of the underlying device physics.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据