Epitaxial growth of horizontally aligned single-crystal arrays of perovskite

Oriented semiconductor nanostructures and thin films exhibit many advantageous properties, such as directional exciton transport, efficient charge transfer and separation, and optical anisotropy, and hence these nanostructures are highly promising for use in optoelectronics and photonics. The controlled growth of these structures can facilitate device integration to improve optoelectronic performance and benefit in-depth fundamental studies of the physical properties of these materials. Halide perovskites have emerged as a new family of promising and cost-effective semiconductor materials for next-generation highpower conversion efficiency photovoltaics and for versatile high-performance optoelectronics, such as light-emitting diodes, lasers, photodetectors, and high-energy radiation imaging and detectors. In this Review, we summarize the advances in the fabrication of halide perovskite nanostructures and thin films with controlled dimensionality and crystallographic orientation, along with their applications and performance characteristics in optoelectronics. We examine the growth methods, mechanisms, and fabrication strategies for several technologically relevant structures, including nanowires, nanoplates, nanostructure arrays, single-crystal thin films, and highly oriented thin films. We highlight and discuss the advantageous photophysical properties and remarkable performance characteristics of oriented nanostructures and thin films for optoelectronics. Finally, we survey the remaining challenges and provide a perspective regarding the opportunities for further progress in this field.

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Section: Random Nanowiresmentioning

confidence: 99%

“…Parallel arrays of halide perovskite NWs can also be grown by physical confinement using patterned substrates, such as ST-cut quartz (Figure 15c,d) 137 and PDMS rectangular groove templates (Figure 15e,f). 138 Using these methods, perovskite crystals are physically constrained during crystallization.…”

Section: Random Nanowiresmentioning

confidence: 99%

Oriented Halide Perovskite Nanostructures and Thin Films for Optoelectronics

et al. 2021

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“…Single crystals are widely used in semiconductor devices due to their potential for studying the relationship between molecular structure and charge transport [1][2][3]. Two-dimensional crystals of organic semiconductors (2DCOSs) have attracted wide attention because of the unique advantages of organic materials [4][5][6][7] as a new research issue of organic electronics and two-dimensional crystals in recent years [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional organic single-crystalline p-n junctions for ambipolar field transistors

Wang

Zheng

et al. 2019

Sci. China Mater.

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Two-dimensional single-crystalline p-n junctions of organic semiconductors (pn-2DCOSs) show great potential in organic logic circuits due to their single crystal nature and excellent ambipolar charge transport. However, there are only few reports on pn-2DCOSs because it is difficult to obtain such highly ordered structure in p-n junction. Herein, a novel and effective solution processing method of secondary transfer technology based on the facile drop casting is used to fabricate devices of pn-2DCOSs based on C 8-BTBT (p-type) and TFT-CN (n-type) successfully. The high-performance ambipolar field transistors based on such ultrathin pn-2DCOSs with several molecular layers thickness show wellbalanced ambipolar charge transport behaviors with hole mobility as high as 0.43 cm 2 V −1 s −1 and electron mobility up to 0.11 cm 2 V −1 s −1 , respectively. This work is essential for studying the intrinsic properties of organic p-n junctions and achieving high performance in organic complementary circuits.

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