Berlin 2024 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 13: Poster I
HL 13.21: Poster
Montag, 18. März 2024, 15:00–18:00, Poster E
Effect of trap states on the performance of organic photodetectors — •Anncharlott Kusber, Jakob Wolansky, Karl Leo, and Johannes Benduhn — Institute of Applied Physics, Technische Universität Dresden, Nöthnitzer Str. 61, 01187 Dresden, Germany
In recent years, the scientific community has increasingly investigated novel semiconductors for solar energy conversion. Recently, this field has seen rapid development, and, for example, organic solar cells achieve power conversion efficiencies close to 20 %. Additionally, similar systems have been employed in organic photodetectors (OPDs), showing very competitive specific detectivities D* > 1013 Jones. However, these OPDs, operated under reverse bias, are still limited due to the shot noise, which is proportional to the high dark reserve current [1]. Therefore, a complete understanding of the dark reverse current is necessary. Recent research has revealed a negative impact of mid-gap trap states on the reverse dark current in OPDs [1]. To understand this impact, studies investigated the influence of charge-transfer excitons and trap states using ultrasensitive external quantum-efficiency measurements as well as impedance spectroscopy. We use the techniques as mentioned above on a model system where we intentionally introduce trap states within the active layer. We find a clear trend between the device performance and the presence and quantity of trap states. [1]: Kublitski, Jonas, et al., Nature Communications 12.1 (2021): 551.
Keywords: photodetector; organic; traps; EQE; IS