Hybrid Field-Effect Transistors and Photodetectors Based on Organic Semiconductor and CsPbI3 Perovskite Nanorods Bilayer Structure

Abstract

The outstanding performances of nanostructured all-inorganic CsPbX3 (X = I, Br, Cl) perovskites in optoelectronic applications can be attributed to their unique combination of a suitable bandgap, high absorption coefficient, and long carrier lifetime, which are desirable for photodetectors. However, the photosensing performances of the CsPbI3 nanomaterials are limited by their low charge-transport efficiency. In this study, a phototransistor with a bilayer structure of an organic semiconductor layer of 2,7-dioctyl [1] benzothieno[3,2-b] [1] benzothiophene and CsPbI3 nanorod layer was fabricated. The high-quality CsPbI3 nanorod layer obtained using a simple dip-coating method provided decent transistor performance of the hybrid transistor device. The perovskite layer efficiently absorbs light, while the organic semiconductor layer acts as a transport channel for injected photogenerated carriers and provides gate modulation. The hybrid phototransistor exhibits high performance owing to the synergistic function of the photogating effect and field effect in the transistor, with a photoresponsivity as high as 4300 A W−1, ultra-high photosensitivity of 2.2 × 106, and excellent stability over 1 month. This study provides a strategy to combine the advantages of perovskite nanorods and organic semiconductors in fabrication of high-performance photodetectors.Electronic supplementary materialThe online version of this article (10.1007/s40820-018-0210-8) contains supplementary material, which is available to authorized users.

Self‐assembled core‐shell structured organic nanofibers fabricated by single‐nozzle electrospinning for highly sensitive ammonia sensors

“…Past decades have witnessed an increasing demand for highly sensitive chemical sensors, as one of the key parts in advanced organic electronics, in environmental monitoring, healthcare, national security, and industrial applications . Therefore, great attention has been paid in improving the output performance of chemical sensors by designing novel structures or selecting highly active materials for trace sensing .…”

“…Past decades have witnessed an increasing demand for highly sensitive chemical sensors, as one of the key parts in advanced organic electronics, in environmental monitoring, healthcare, national security, and industrial applications. [1][2][3][4][5][6][7] Therefore, great attention has been paid in improving the output performance of chemical sensors by designing novel structures or selecting highly active materials for trace sensing. [8][9][10][11] Organic semiconductors (OSCs), as a kind of active semiconducting material, have a great potential in detecting a wide range of poisonous and flammable analytes, such as ammonia (NH 3 ), nitrogen dioxide (NO 2 ), and dimethyl methylphosphonate (DMMP), due to the intrinsic environmental sensitivity of the OSCs.…”

Recent developments in flexible photodetectors based on metal halide perovskite

“…gold, silver and aluminum, etc.) thin films have been widely employed as electrode materials owing to their simple vacuum thermal deposition process and superior compatibility with the most substrate materials . Among the metallic film materials, Au and Ag were reported more than other metals in PDs because of their excellent ductility and conductivity.…”

“…and inorganic materials (carbon nanotubes, metal oxides, transition‐metal dichalcogenides etc.) have been widely researched …”

CsPbI3 Nanotube Photodetectors with High Detectivity

“…To date, 1D nanomaterials of CsPbI 3 are prepared typically through hot‐injection, room‐temperature reprecipitation, solvothermal, anion exchange, microwave strategy, vapor deposition, and so on. In terms of the morphology‐dependent performance, 1D CsPbI 3 nanomaterials have been grown in various morphologies, including nanowires, and nanorods . The conductive channel of 1D CsPbI 3 nanostructured materials could confine the active area of charge carriers and shorten the carrier transit time, making them be advantageous for exploring high‐performance PDs .…”