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

Abstract

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.

Molecularly Thin 2D Organic Single Crystals: A New Platform for High-Performance Polarization-Sensitive Phototransistors

“…This finding indicates that polarization-sensitive photodetection primarily originates from structure-induced polarization-dependent light absorption. Remarkably, both the P and LDR abs metrics outperform those reported in previous organic PSPs, to the best of our knowledge (refer to Figure a). ,,,− We have depicted a clear polarization dependency of the photocurrent in Figure S16, ESI, and have plotted the corresponding angle-resolved normalized photocurrent curve in polar coordinates (Figure b). The photocurrent exhibits a peak when the polarization aligns with the c axial direction of the DTT-8 crystals and diminishes with an increase in the polarization angle, reaching a valley when perpendicular to the b axial direction.…”

“…Polarization-sensitive photodetectors (PSPs), capable of distinguishing not only the wavelength and intensity of light but also its polarization state, have garnered significant attention owing to their broad applications in fields such as navigation, security surveillance, and information encryption. − Two main strategies are employed in constructing PSPs. ,− The first, a conventional method, utilizes optical filters and polarizers to isolate polarized light, a process that unfortunately results in light loss and necessitates complex device architectures. ,, The second, an emerging approach, leverages materials with intrinsic linear dichroism (LD) to achieve polarization sensitivity, circumventing the need for elaborate external polarization optics and preserving light intensity. − ,,− …”

Highly‐Polarized Solar‐Blind Ultraviolet Organic Photodetectors

“…[44,45] As shown in Figure 3f, benefiting from the intrinsic linear dichroism of the BPTTE single crystal, the DR of the BPTTE single crystal photodetector stands out among many representative polarizationsensitive photodetectors, being one of the highest values reported in the literature to date. [27,44,28,29,[46][47][48][49][50][51][52] Higher device performance can be achieved by optimizing the device surface and fine-tuning the device structure, such as introducing passivated buffer layers to reduce interface defects, constructing heterojunctions, or introducing gate modulation. [50,[53][54][55][56] Considering the highly polarized photoresponse characteristics and stability of the BPTTE single crystal photodetectors, they are utilized for polarimetric imaging of ultraviolet.…”

Recent advances in fabrication and functions of neuromorphic system based on organic field effect transistor

“…Noticeably, organic semiconductor materials have great advantages due to their easy processing, pollution-free, and suitability for large-area preparation, making them suitable for neuromorphic field effect transistors and applications [28][29][30][31][32][33]. Many natural organic materials, with the advantages of renewability, sustainability, biodegradability, and environmentally friendliness, are investigated [34][35][36][37].…”