Large-area aligned growth of single-crystalline organic nanowire arrays for high-performance photodetectors

Abstract

Due to their extraordinary properties, single-crystalline organic nanowires (NWs) are important building blocks for future low-cost and efficient nano-optoelectronic devices. However, it remains a critical challenge to assemble organic NWs rationally in an orientation-, dimensionality- and location-controlled manner. Herein, we demonstrate a feasible method for aligned growth of single-crystalline copper phthalocyanine (CuPc) NW arrays with high density, large-area uniformity and perfect crossed alignment by using Au film as a template. The growth process was investigated in detail. The Au film was found to have a critical function in the aligned growth of NWs, but may only serve as the active site for NW nucleation because of the large surface energy, as well as direct the subsequent aligned growth. The as-prepared NWs were then transferred to construct single NW-based photoconductive devices, which demonstrated excellent photoresponse properties with robust stability and reproducibility; the device showed a high switching ratio of ∼180, a fast response speed of ∼100 ms and could stand continuous operation up to 2 h. Importantly, this strategy can be extended to other organic molecules for their synthesis of NW arrays, revealing great potential for use in the construction of large-scale high-performance functional nano-optoelectronic devices.

Iron phthalocyanine nanorods for ethanol sensoring

“…MPc nanomaterials were found to have outstanding redox and electronic properties that were interesting in gas-sensors applications, active material for molecular electronic devices, photodetectors and photocatalytic catalyst [14][15][16][17][18]. It is found that the gas-sensor performance of MPc strongly depends on its microstructure [19][20][21].…”

Controllable preparation of copper phthalocyanine single crystal nano column and its chlorine gas sensing properties

“…Moreover, lattice fringes from high resolution TEM (HRTEM) image (Figure 2b) and electron diffraction spectroscopy (EDS) pattern (Figure 2c) reveal that the CuPc nano columns are α-phase single crystalline. The presence of lattice spacing of 1.295 nm indicates that the nano column has (010) planes, 6,14 while the growth orientation is determined to be [010]. According to these results, a representation of the crystal structure (inset in Figure 2c) can be drawn.…”

Heterogeneous Monolithic Integration of Single‐Crystal Organic Materials

“…These include (i) vapor‐grown ultrapure pentacene single crystal devices with field‐effect mobilities of 15–40 cm 2 V −1 s −1 ; (ii) vapor‐grown rubrene single crystal based OFETs with a mobility of 18 cm 2 V −1 s −1 , which utilized a chemically‐treated dielectric surface to reduce the charge trap density; (iii) a vacuum‐gap field‐effect transistor with a hole mobility of about 10 cm 2 V −1 s −1 by using platelet‐like, thin dinaphtho[2,3‐ b :2′,3′‐f]thieno[3,2‐ b ]thiophene (DNTT) single crystals grown by horizontal physical vapor transport in; and (iv) epitaxy‐grown, two‐dimensional C 8 ‐BTBT crystal‐based OFETs with a mobility of 10 cm 2 V −1 s −1 . Often, the vapor‐based growth process is combined with the template‐assisted approach to control the growth, alignment, and positioning of organic single crystals . Organic single crystals including pentacene, rubrene, tetracene, C 60 , F 16 CuPc, and tetracyanoquinodimethane (TCNQ), have been directly grown on octadecyltriethoxysilane (OTS)‐printed domains (Figure d) .…”

“…These approaches facilitated the fabrication of large arrays of high‐performance, single‐crystal OFETs for flexible device applications. In another study, Au film domains were introduced on a substrate to grow vertically‐aligned, single‐crystal copper phthalocyanine (CuPc) . As a result of the high surface energy, CuPc nanowire arrays were grown selectively on the Au film‐coated areas.…”