Sensitive Self-Driven Single-Component Organic Photodetector Based on Vapor-Deposited Small Molecules.
Year: 2024
Type: article
Abstract: Typically, organic solar cells (OSCs) and photodetectors (OPDs) comprise an electron donating and accepting material to facilitate efficient charge carrier generation. This approach has proven successful in achieving high-performance devices but has several drawbacks for upscaling and stability. This study presents a fully vacuum-deposited single-component OPD, employing the neat oligothiophene derivative DCV2-5T in the photoactive layer. Free charge carriers are generated with an internal quantum efficiency of 20 % at zero bias. By optimizing the device structure, a very low dark current of 3.4 · 10-11 A cm-2 at -0.1 V is achieved, comparable to the dark current of state-of-the-art bulk heterojunction OPDs. This optimization results in specific detectivities of 1· 1013 Jones (based on noise measurements), accompanied by a fast photoresponse (f-3dB = 200 kHz) and a broad linear dynamic range (> 150 dB). Ultrafast transient absorption spectroscopy unveils that charge carriers are already formed at very short time scales (< 1 ps). The surprisingly efficient bulk charge generation mechanism is attributed to a strong electronic coupling of the molecular exciton and charge transfer states. This work demonstrates the very high performance of single-component OPDs and proves that this novel device design is a successful strategy for highly efficient, morphological stable and easily manufacturable devices.
DOI: 10.48620/78582
Authors: Wolansky, Jakob, Hoffmann, Cedric, Panhans, Michel, Winkler, Louis Conrad, Talnack, Felix, Hutsch, Sebastian, Zhang, Huotian, Kirch, Anton, Yallum, Kaila M., Friedrich, Hannes, Kublitski, Jonas, Gao, Feng, Spoltore, Donato, Mannsfeld, Stefan C B, Ortmann, Frank, Banerji, Natalie, Leo, Karl, Benduhn, Johannes
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6929301581
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