公开(公告)号：EP3240044A1

公开(公告)日：2017-11-01

申请号：EP16167252.2

申请日：2016-04-27

申请人： Emberion Oy

发明人： Astley, Michael Robert ,  Colli, Alan

IPC分类号： H01L31/02 ,  H01L31/0352 ,  H01L31/112

CPC分类号： H01L31/112 ,  H01L31/02019 ,  H01L31/035209 ,  H01L31/035218

摘要： Methods of reducing flicker noise in photodetectors are disclosed. A photodetector comprises a channel (303) made from a two-dimensional material like graphene and has a plurality of quantum dots (306) formed thereon for electron-hole pair (312, 313) generation from incident electromagnetic radiation (307). To a gate electrode (304) which is separated from the channel (303) by a dielectric material a time-varying voltage (311) is applied to modulate the response of the photodetector. From the resulting source-drain current, a signal is derived which is further processed to reduce flicker noise in the photodetector signal. The further signal processing is performed by a lock-in technique or by correlated double sampling. In a further embodiment, the time-varying voltage may be sufficiently large in magnitude to "reset" trapped charge states to a charged or discharged state each time the voltage is changed for further reduction of the flicker noise.

摘要翻译： 公开了减少光电探测器中的闪烁噪声的方法。 光电检测器包括由石墨烯等二维材料制成的通道（303），并且具有形成在其上的用于从入射电磁辐射（307）产生电子 - 空穴对（312,313）的多个量子点（306）。 对通过介电材料与沟道（303）分开的栅电极（304）施加时变电压（311）以调制光电检测器的响应。 从得到的源极 - 漏极电流导出信号，该信号被进一步处理以减少光电探测器信号中的闪烁噪声。 进一步的信号处理通过锁定技术或通过相关双采样来执行。 在另一个实施例中，每当电压改变时，时变电压的量值足够大以将捕获的电荷状态“重置”到充电或放电状态，以进一步减少闪烁噪声。