## 1 Introduction  
Organic semiconductors (OSCs) have gained significant attention in recent decades due to their unique advantages in solution processing, chemical versatility, and light weight, in addition to their mechanical flexibility. Owing to these potential advantages, organic semiconductors are now employed in many electronic applications as active layers, replacing traditional inorganic materials such as organic photovoltaics (OPVs) [1, 2, 3], organic field-effect transistors (OFETs) [4, 5], and bioelectronic devices [6, 7]. Among these applications, organic thin film transistors (OTFTs), used as bioelectronic devices, have progressively and currently become an important research topic focusing on the field of organic bioelectronics. One of the primary features of organic thin film transistors (OTFTs) is that they utilize organic compounds, which can be either polymers or small molecules, facilitating cost-effective and large-scale production. The flexible substrates, including fabric, foil, fiber, plastic, and paper, enable OTFTs to be effectively employed in environmental monitoring, biomedical applications, and chemical sensing. This versatility arises from their capability to detect a wide range of analytes, including gases, biomolecules, and ions. RFID tags for item-level tracking and inventory management can also be produced at a low cost and with flexibility. Additionally, organic thin film transistors (OTFTs) may be investigated for the development of low-power solutions suitable for Internet of Things (IoT) applications, including smart homes, industrial automation, and wearable technology [8]. Organic semiconductors (OSCs) are materials that possess the unique ability to transition between being effective conductors and efficient insulators. This transformation is primarily governed by the doping process or variations in the electric field, which dictate the material's conductive state [9]. This typically involves adding or removing electrons to change the charge carrier density and allow the material to conduct charge, with electron-transporting polymers being classified as n-type materials, while p-type materials transport holes [10, 11, 12, 13, 14]. Currently, p-type materials dominate the transistor logic circuits due to their high performance, especially in field-effect mobility; for example, the hole mobility (\(\mu_{p}=10^{-1}\)cm\({}^{2}\)/V.s) for pentacene is very large compared to that its electron mobility (\(\mu_{e}=5\times 10^{-3}\)cm\({}^{2}\)/V.s) [15, 16], although the development of electron transport materials (ETMs) has consistently lagged behind [17]. Progress in n-type materials for OTFTs is needed to enable complementary logic circuits assembled with matched p-type materials that reduce static power consumption, allowing faster circuit speeds, extra complex circuits, and improved operational stability [18]. P-type and n-type operation with well-matched electrical and thermal conductivities are also needed in OTE generators [19]. Among the n-type organic semiconductors widely used as ETMs, fullerene (C\({}_{60}\)) has been included in OFETs and organic electronics due to its high electron mobility [16]. Its spherical soccer ball shaped molecule and exceptional electronic properties, fullerenes constitute an important research topic in medicine and biology fields [20, 21, 22, 23]. C\({}_{60}\)-based nanomaterials have good prospects in cancer treatment [24], such as killing HeLa cells [25] and providing radioprotection to radiosensitive mammalian cells. An aqueous dispersion of C\({}_{60}\) fullerene has outstanding anti-inflammatory effect, which also acts as an antioxidant and an anti-aging medicine. Nearly all these applications are not yet available to the public [26]. In order to fabricate an OTFT, one needs first to choose the deposition technique suitable for the organic material (fullerene). Thermal sublimation of pure C\({}_{60}\) was first used in early 1900 [27] to deposit uniform fullerene films on sapphire and KBr substrates.