高度对齐有机微线晶体阵列用于高性能偏振敏感光电探测器和图像传感器

Highly aligned organic microwire crystal arrays for high-performance polarization-sensitive photodetectors and image sensors

有机微纳晶体的图案化对于实现高度集成的有机光电子器件具有重要意义.然而在溶液法制备有机微纳晶体过程中,溶液流动的无序性会导致所制备的微纳晶体分布和排列具有高度无序性和不可控性,从而导致所制备的器件阵列中器件与器件之间的性能差异显著,不利于实现微纳器件的集成化.因此,本文提出一种模板控制溶液流动的方法,实现了有机微米线晶体可控图案化.基于有序排列的微米线晶体图案阵列,所制备的光电探测器不仅具有高性能,且器件-器件差异低至3.58%.结合微米线高度的结构各向异性,所制备的光电探测器阵列成功实现了偏振敏感成像功能.

Organic semiconductors with excellent optoelectronic properties are important building blocks for highperformance organic devices.Patterning organic crystals with high precision and accurately positioning them at the target position are major challenges for integrated devices.However,uncontrollable dewetting of the conventional solution method leads to as-prepared micro-nanocrystals with high defect-state density,low crystalline quality,and disordered distribution,which impair the uniformity of the device performance and limit integration.By regulating the solution position with a template and guiding the solution flow direction under gravity,aligned organic microwire arrays and polygonal patterns were fabricated.The polarization-sensitive photodetector exhibited responsivity up to 1234 A W^(-1),linear dynamic range of 148 dB,I_(photo)/I_(dark)of 10^(4),response time as low as 1.1 ms,and dichroic ratio up to 2.1.Given the homogeneity of microwire arrays,the device-to-device variation was reduced to 3.58%,resulting in high-quality imaging.This study provides new insights into organic micro/nanocrystal patterning and device integration.