Interface Trap States in Organic Photodiodes
Please always quote using this URN: urn:nbn:de:bvb:20-opus-131507
- Organic semiconductors are attractive for optical sensing applications due to the effortless processing on large active area of several \(cm^2\), which is difficult to achieve with solid-state devices. However, compared to silicon photodiodes, sensitivity and dynamic behavior remain a major challenge with organic sensors. Here, we show that charge trapping phenomena deteriorate the bandwidth of organic photodiodes (OPDs) to a few Hz at low-light levels. We demonstrate that, despite the large OPD capacitances of similar to 10 nF \(cm^{-2}\), aOrganic semiconductors are attractive for optical sensing applications due to the effortless processing on large active area of several \(cm^2\), which is difficult to achieve with solid-state devices. However, compared to silicon photodiodes, sensitivity and dynamic behavior remain a major challenge with organic sensors. Here, we show that charge trapping phenomena deteriorate the bandwidth of organic photodiodes (OPDs) to a few Hz at low-light levels. We demonstrate that, despite the large OPD capacitances of similar to 10 nF \(cm^{-2}\), a frequency response in the kHz regime can be achieved at light levels as low as 20 nW \(cm^{-2}\) by appropriate interface engineering, which corresponds to a 1000-fold increase compared to state-of-the-art OPDs. Such device characteristics indicate that large active area OPDs are suitable for industrial sensing and even match medical requirements for single X-ray pulse detection in the millisecond range.…
Author: | Francesco Arca, Sandro F. Tedde, Maria Sramek, Julia Rauh, Paolo Lugli, Oliver Hayden |
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URN: | urn:nbn:de:bvb:20-opus-131507 |
Document Type: | Journal article |
Faculties: | Fakultät für Physik und Astronomie / Physikalisches Institut |
Language: | English |
Parent Title (English): | Scientific Reports |
Year of Completion: | 2013 |
Volume: | 3 |
Pagenumber: | 1324 |
Source: | Scientific Reports 3, 1324; DOI:10.1038/srep01324 (2013). |
DOI: | https://doi.org/10.1038/srep01324 |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 541 Physikalische Chemie |
Tag: | electrical and electronic engineering; materials for optics; polymers; ultrafast photonics |
Release Date: | 2016/05/18 |
Licence (German): | CC BY-NC-ND: Creative-Commons-Lizenz: Namensnennung, Nicht kommerziell, Keine Bearbeitung |