2D material photonic detectors and cameras

Here we present an MoS2 based photodetector array with a sub-10-micron pitch in both lateral directions with a maximum responsivity of 0.8 A/W that can be fabricated on nearly any substrate. The arrays are shown on a standard rigid substrate and on a flexible polymer substrate with operation continuing to a maximum bending radius of 1.25cm and less than 10% variation of device performance across repeated bending cycles. Also demonstrated is a post-fabrication tuning process to ensure that all devices in the system operate at the same level using a maximum of 2V. This achieved by careful design of the array electrodes and the usage of a specialized 2D material transfer to accurately transfer exfoliated flakes of MoS2 to designated areas on the electrode design. With the assistance of a semi-automated program an operator of the system can transfer flakes on to the design with an average rate of 1 per minute. We believe that these arrays can see potential usage in wearable devices by being resilient to bending conditions, having a high density, and reliable performance with tuning.