Inkjet-printed Filter-less narrowband colloidal Quantum Dot photodetectors and image sensors (IFQD)

在可预见的未来，“类眼睛”或“类皮肤”的软图像传感器有望在我们的日常生活中发挥重要作用。然而，目前的图像传感电子设备并不容易适合于面向人类的应用所需的大型柔性表面，因为它们是由刚性全色硅（CCD）或化合物半导体光电探测器（CMOS）制成的，并与一系列光学滤光片集成在一起用于颜色识别。彩色滤光片的使用也限制了探测器阵列的可折叠性和像素密度。胶体量子点（QDs）表现出优异的与衬底无关的柔韧性和探测能力。然而，它们广泛的光吸收意味着需要添加滤光片，以使它们特定于某种颜色的光。到目前为止，最成功的无滤波器模型是基于电荷收集变窄（CCN）光电二极管，这是一种将特定颜色的光转换为电流的半导体器件。然而，由于窄带响应是通过控制光产生的电荷收集效率来实现的，因此通常需要微米厚度的结，这导致阵列具有更大的像素间串扰和频率带宽限制的可能性。该IFQD博士研究生项目旨在全面研究使用无毒量子点(硒化锌碲化硫化物（ZnSeTeS）和磷化铟镓（InGaP），以有效地检测特定波长内的光，厚度仅为几百纳米。此外，我们将使用高反射率腔（例如增强光吸收）来减少结厚度，并使用喷墨打印机进行CCN光电探测器的微制造和多像素图像传感器集成。

In the foreseeable future, 'eye-like' or 'skin-like' soft image sensors are expected to play essential roles in our daily life. However, current image sensing electronics are not readily suited for the large flexible surfaces required for human-oriented applications because they are made of rigid panchromatic silicon (CCD) or compound semiconductor photodetectors (CMOS) and integrated with an array of optical filters for colour discrimination. The use of colour filters also limits the foldability and pixels density of the detector array. Colloidal quantum dots (QDs) have shown excellent substrate-agnostic flexibility and detectivity. However, their broad light absorption means filters need to be added to make them specific to a certain colour of light. So far, the most successful filter-less model is based on charge collection narrowing (CCN) photodiodes, which are semiconductor devices that convert the specific colour of light into an electrical current. However, since the narrowband response is delivered by controlling photogenerated charge collection efficiency, micrometres thickness junction is often required, which results in an array with a greater likelihood of interpixel cross-talk and frequency bandwidth limitations. This IFQD PhD studentship is designed as a comprehensive study on using non-toxic QDs (zinc selenide telluride sulphide (ZnSeTeS), and indium gallium phosphide (InGaP) to efficiently detect light within a specific wavelength of interest at thicknesses as little as a few hundred nanometres. In addition, we will use high reflectivity cavities (e.g. enhance light absorption) to reduce the junction thickness and use an inkjet printer for CCN photodetectors microfabrication and multiple pixel image sensor integrations.