Weak epitaxy growth of organic semiconductor thin films

et al. 2017

Mater. Trans.

A stable n-type semiconductor material, ZnPcF 16 , was synthesized and characterized by infrared (IR), UV-vis and uorescence spectra. ZnPcF 16 showed a monomer characteristic in 1, 2-dichlorobenzene (DCB) while exhibited an aggregation property in tetrahydrofuran (THF) and dimethylformamide (DMF). The ZnPcF 16 /p-6p (ZnPcF 16 on p-6p) organic thin lm transistors (OTFTs) using ZnPcF 16 as an active layer and p-6p as an inducing layer was fabricated by the physical vapor deposition technique. The ZnPcF 16 semiconductor lm was characterized by XRD and SEM. And the results showed that ZnPcF 16 molecules can be oriented after the employment of the p-6p inducing layer. Charge carrier eld-effect mobility (µ) and threshold voltage (V T ) of the ZnPcF 16 /p-6p OTFTs were 1.3 × 10 −2 cm 2 /V s and 22 V, respectively.

Section: Thermal Propertiesmentioning

confidence: 99%

Synthesis, Spectral Properties of Zinc Hexadecafluorophthalocyanine (ZnPcF<sub>16</sub>) and Its Application in Organic Thin Film Transistors

Sun

et al. 2017

Mater. Trans.

“…In addition to the morphology improvement of the interfaces, the presence of p-6P films, as reported extensively, [39] could benefit to promote the crystallinity and orientation of organic semiconductor films upon deposition. To verify the ordering information, we performed 2D grazing incidence X-ray diffraction (2D-GIXRD) to check the packing structures of the pentacene films.…”

Section: Resultsmentioning

confidence: 99%

“…Inserting an inducing layer has been widely applied in top contact transistors and received considerable attentions. [38][39][40] Herein, the organic layer which forms lamellar grains from the edge of the photolithographypatterned electrodes was deposited prior to depositing the active layer. The following organic semiconductor layer grown on the inducing layer formed lamellar films on the inducing layer, enabling a good contact between the electrodes and the organic semiconductor thin films.…”

Section: High-performance Bottom-contact Organic Thin-film Transistormentioning

confidence: 99%

See 1 more Smart Citation

High‐Performance Bottom‐Contact Organic Thin‐Film Transistors by Improving the Lateral Contact

Zhang

Zhou

et al. 2017

Adv Elect Materials

prepatterned electrodes on the substrates generate artificial steps that significantly affect the morphological uniformity and continuity of the organic active layer at the electrode/organic interfaces, causing large contact resistance. The most common solution is to modify the electrodes, e.g., chemical bonding of thiols on gold, inserting buffer layer on the electrodes, or applying conductive materials such as graphene, polypyrrole as electrodes. [2,10, These approaches could either realize a good energy level alignment or improve the interface morphology to decrease the contact resistance. Nevertheless, the performances of the BC transistors are still insufficient to match the application requirements.It is known that the resistance of the transistors consists of channel resistance and contact resistance. The latter is determined by the carrier injection from the interfaces of the organic/electrode: the top injection and the side injection. [22] With regard to the side injection, a major issue is the morphology discontinuity near the edge of the electrodes. Previously, Kudo and co-workers proposed a method that embedding electrodes into the dielectric layer to achieve a planar interface and obtained a mobility ≈0.48 cm 2 V −1 s −1 (in saturate regime) for pentacene, but this will induce relatively complicate patterning process. [33][34][35] Li et al. treated the electrodes with fluorine substituted benzene thiol and effectively improved the texture from the contacts extending to thwe channel, as well as the performance of corresponding solution casted BC transistors. [30,36,37] Here, we report a simple method to improve the continuity of organic films at the lateral interfaces of electrode/organic through incorporating an organic inducing layer. Inserting an inducing layer has been widely applied in top contact transistors and received considerable attentions. [38][39][40] Herein, the organic layer which forms lamellar grains from the edge of the photolithographypatterned electrodes was deposited prior to depositing the active layer. The following organic semiconductor layer grown on the inducing layer formed lamellar films on the inducing layer, enabling a good contact between the electrodes and the organic semiconductor thin films. As a result, a remarkable decrement of the contact resistance is achieved. Together with the improved film ordering by weak epitaxy on the inducing layer in the channel area, we achieved high performance bottom contact thin film transistors with the maximum mobility exceeding 1 cm 2 V −1 s −1 for pentacene in ambient condition, which is comparable to the top contact ones.One of the main challenges to achieve high-performance bottom-contact transistors involves the organic/electrodes contacts. This study provides a simple approach to address the contact issue by incorporating an inducing layer prior to the organic semiconductor deposition. The molecules of the inducing layer nucleate into lamellar grains from the edge to the channel, resulting in a good morphological contact to th...

“…We have done a lot of work on the growth of ordered organic semiconductor thin film and the control of interface morphology, as well as their applications in organic optoelectronic devices, which are summarized in the reviews [25][26][27]. Focusing on the interface issues of OSCs and PSCs, our group has been carrying out the research, and some interesting results have been obtained [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Interface modification for organic and perovskite solar cells

Yang

2016

Sci. China Mater.

Self Cite

Organic solar cells (OSCs) continuously attract much attention due to their potentials as the low-cost and lightweight sources of renewable energy, and the power conversion efficiency (PCE) of the state-of-the-art OSCs has reached over 10.0%. Especially, there has been an unexpected breakthrough and rapid evolution of highly efficient organic-inorganic hybrid perovskite solar cells (PSCs), and the PCE has been improved to over 20%. The interface plays a very important role on the performance of both OSCs and PSCs, as well as their stability. It is imperative to control the interface properties and understand the mechanisms for obtaining highly efficient OSCs and PSCs. In this review, we will summarize our research progress on the interface modification of OSCs and PSCs using the electron transport layer and hole transport layer, as well as the molecular template layer.