Converting light into electrical signals is essential for a number of future applications including imaging, optical communication and biomedical sensing. Researchers from the University of Münster have now developed a new molecular device enabling to detect light and translate it with high efficiency to detectable electronical current. Their work has been published in the latest issue of the journal “Nature Communications”.
Phototransistors are important electronic building units enabling to capture light and convert it to electrical signal. For future applications such as foldable electronic devices, organic phototransistors (OPTs) attract a lot of attentions due to their attractive properties including flexibility, low cost, light weight, ease of large-area processing and precise molecular engineering.
So far the development of OPTs has still lagged behind that of inorganic or hybrid materials, mainly because the low mobility of most organic photoresponsive materials limits the efficiency of transporting and collecting charge carriers.
Researchers from the Physical Institute and Center for Nanotechnology (CeNTech) in Münster headed by Prof. Dr. Harald Fuchs, have now developed together with collogues from China a novel thin-film OPT arrays.
Their approach is based on a small-molecule - 2, 6-diphenylanthracene (DPA), which has a strong fluorescence anthracene as the semiconducting core and phenyl groups at 2 and 6 positions of anthracene to balance the mobility and optoelectronic properties.
The fabricated small-molecule OPT device shows high photosensitivity, photoresponsivity and detectivity. “The reported values are all superior to state-of-the-art OPTs and among the best results of all previously reported phototransistors to date.
At the same time, our DPA-based OPTs also show high stability in the air”, says Dr. Deyang Li. Dr. Saeed Amirjalayer adds: “By combining our experimental data with atomistic simulation, we are, in addition, able to explain the high performance of our device, which is important for a rational development of these devices.”
The WWU researchers believe that, therefore, DPA offers great opportunity towards high-performance OPTs for both fundamental research and practical applications such as sensor technology or data transfer.
The work was funded by the German Research Foundation (SFB 858 und TRR 61).
Prof. Dr. Harald Fuchs
Wilhelm-Klemm Str. 10
Tel: Tel.: +49 (0)251 83-33621
Fax: Fax : +49 (0)251 83-33602
Deyang Ji, Tao Li, Jie Liu, Saeed Amirjalayer, Mianzeng Zhong, Zhao-Yang Zhang, Xianhui Huang, Zhongming Wei, Huanli Dong, Wenping Hu and Harald Fuchs: Band-like transport in small-molecule thin films toward high mobility and ultrahigh detectivity phototransistor arrays. Nature Communications 10, Article number: 12 (2019). doi: 10.1038/s41467-018-07943-y.
Dr. Kathrin Kottke | idw - Informationsdienst Wissenschaft
Nature's magnifying glass reveals unexpected intermediate mass exoplanets
09.01.2019 | W. M. Keck Observatory
Quantum scientists demonstrate world-first 3D atomic-scale quantum chip architecture
08.01.2019 | University of New South Wales
Research opens doors in photonic quantum information processing, optical signal processing and microwave photonics
Researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have developed a new integrated photonics platform that can...
A team of experimentalists at the U.S. Department of Energy's Ames Laboratory and theoreticians at University of Alabama Birmingham discovered a remarkably long-lived new state of matter in an iron pnictide superconductor, which reveals a laser-induced formation of collective behaviors that compete with superconductivity.
"Superconductivity is a strange state of matter, in which the pairing of electrons makes them move faster," said Jigang Wang, Ames Laboratory physicist and...
Some patients with breast cancer receive chemotherapy before the tumor is removed with surgery. This approach, called 'neoadjuvant' therapy, helps to reduce the size of the tumor to facilitate breast-conserving surgery, and can even eradicate the tumor, leaving few or no cancerous cells for the surgeon to remove. In those cases, the patients are very likely to remain cancer-free for life after surgery.
But not all tumors shrink under chemotherapy. If the tumor resists neoadjuvant therapy, there can be a higher risk of developing metastatic disease, meaning...
During the conversion of light into electricity, such as in solar cells, a large part of the input light energy is lost. This is due to the behaviour of...
In order to analyse climate change or provide information about natural hazards, it is important to gather knowledge about the rain. Better knowledge of precipitation and its distribution could, for example, help protect against river flooding. A new approach uses, for the first time, information contained in radar signals from navigation satellites to detect rain over the sea. The technology could help to monitor atmospheric precipitation better than before.
In order to analyse climate change or provide information on natural hazards, for example, it is important for researchers to gather knowledge about rain.
12.12.2018 | Event News
10.12.2018 | Event News
06.12.2018 | Event News
09.01.2019 | Health and Medicine
09.01.2019 | Interdisciplinary Research
09.01.2019 | Health and Medicine