Review—Charge Carrier Mobility of Organic Thin Film Transistor: Intrinsic and Extrinsic Influencing Factors Based on Organic Semiconducting Materials

Wahab, Nur Zuraihan Abd; Abdulhameed, Abdullah; Ismail, Ahmad Ghadafi; Ramli, Muhammad Mahyiddin; Sidek, Roslina Mohd; Shafie, Suhaidi; Mohtar, Mohd Nazim

doi:10.1149/2162-8777/acc75c

Cited by 4 publications

(1 citation statement)

References 221 publications

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“…Fabrication of solution-processed polymer FETs is a low-cost solution for applications like flexible displays, healthcare and large-area electronics but this method increases the level of polymer disorder. Furthermore, device mobility strongly depends upon solvent, solution concentration, deposition temperature, post-deposition annealing temperature and deposition method [16,[21][22][23]. All these factors affect the molecular packing of deposited material.…”

Section: Introductionmentioning

confidence: 99%

Long-range polymer ordering by directional coating to remarkably enhance the charge carrier mobility in PCDTPT-based organic field-effect transistors

Iqbal,

Saghir,

Afzal

et al. 2024

R. Soc. Open Sci.

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With the wide potential of organic field-effect transistors in all the modern electronic circuitries, researchers are grappling with the challenge of poor charge transport and hence lower mobility in organic polymers. Low-charge carrier mobility is mainly due to disorder in the molecular packing of organic semiconductors along with other factors, such as impurities, defects and interactions between molecules. The current research work has been conducted to align the molecular chains of poly[4-(4,4-dihexadecyl-4H-cyclopenta[1,2-‌‌‌b:5,4-‌b′]‌dithiophen-2-yl)-alt-[1,2,5]thiadiazolo-[3,4-c]pyridine] (PCDTPT) using directional coating techniques such as dip coating and brush coating on nano-grooved substrates. Long-range order of polymer chains was clearly observed along the direction of brush coating and nanogrooves in optical and atomic force microscope (AFM) images while transmission spectra confirmed decreased pi–pi stacking for the polymer films deposited by this technique. By comparing the mobility performance of brush-coated devices with other techniques, we found a remarkable mobility enhancement of 90 times that of conventional spin-coated device and 24 times enhancement compared with the dip-coated device for the case when the alignment of polymer chains was parallel to the channel. All the fabrication and characterizations were performed in the ambient environment. This study demonstrates a potential approach to align the polymers on long and short ranges hence providing a route for high-performing devices in ambient conditions.

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Section: Introductionmentioning

confidence: 99%

Long-range polymer ordering by directional coating to remarkably enhance the charge carrier mobility in PCDTPT-based organic field-effect transistors

Iqbal,

Saghir,

Afzal

et al. 2024

R. Soc. Open Sci.

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Performance Improvement of Formamidinium‐Based Perovskite Photodetector by Solution‐Processed C8‐BTBT Modification

Huang,

Ding,

Liu

et al. 2024

Advanced Optical Materials

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Organic–inorganic hybrid perovskite has attracted extensive research due to its excellent optoelectronic properties and is a competitive candidate material for a new generation of photodetectors. However, lateral structure photodetectors based only on perovskite active materials still present moderate performance and poor stability. Herein, lateral structure formamidinium‐based perovskite FA0.9Cs0.1PbI3 photodetectors are reported which are modified by a solution‐processed organic semiconductor 2,7‐dioctyl[1]benzothieno[3,2‐b][1]benzothiophene (C8‐BTBT) layer for improved photosensitive performance and ambient/flexibility stability. High‐mobility organic semiconductor C8‐BTBT serves as an efficient hole transport layer that fills the grain boundaries and gaps of the FA0.9Cs0.1PbI3 film, enabling rapid extraction and transport of the photo‐generated carriers from the perovskite to the electrodes, resulting in enhanced photosensitive performance of the photodetector. Compared with the original device, the C8‐BTBT‐modified photodetector exhibits dramatically improved performance with a best responsivity of 1278 mA W−1, specific detectivity of 1.58 × 1012 Jones, external quantum efficiency of 298%, and fall time of 14.09 ms, which is 10.84 times less than 152.76 ms of the pure perovskite device. Moreover, the C8‐BTBT film acts as a protective layer for the FA0.9Cs0.1PbI3 film because of its good air stability and effective coverage, which significantly improves the ambient stability of the perovskite photodetector compared with the original device, increasing photocurrent retention from 2.5% to 61.5% or 81.5% at different humidity after 6 days. Furthermore, the C8‐BTBT‐modified perovskite photodetector exhibits outstanding flexibility performance, with only a 5% reduction in photocurrent under bending and almost no change after 200 bending cycles, while those of the pristine perovskite device have degraded to ≈80% and ≈75% under the same conditions, respectively. This study provides a facile and effective solution‐processed‐based strategy for constructing high‐performance and stable perovskite photodetectors.

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Film-Depth-Dependent Charge Mobilities in Organic Semiconductor Films

Wang,

Wei,

Qin

et al. 2024

Chemical Engineering Journal

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Review—Charge Carrier Mobility of Organic Thin Film Transistor: Intrinsic and Extrinsic Influencing Factors Based on Organic Semiconducting Materials

Cited by 4 publications

References 221 publications

Long-range polymer ordering by directional coating to remarkably enhance the charge carrier mobility in PCDTPT-based organic field-effect transistors

Long-range polymer ordering by directional coating to remarkably enhance the charge carrier mobility in PCDTPT-based organic field-effect transistors

Performance Improvement of Formamidinium‐Based Perovskite Photodetector by Solution‐Processed C8‐BTBT Modification

Film-Depth-Dependent Charge Mobilities in Organic Semiconductor Films

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