Photovoltaic Materials, Devices, and Technologies

Pentacene/K12 solar cells formed by organic vapor phase deposition

[+] Author Affiliations
Sebastian Axmann, Michael Brast, Andrei Vescan, Holger Kalisch

RWTH Aachen University, Device Technology, 52074 Aachen, Germany

Ajay Kumar Pandey, Paul Burn, Paul Meredith

University of Queensland, Centre for Organic Photonics & Electronics, Brisbane, Queensland 4072, Australia

Michael Heuken

RWTH Aachen University, Device Technology, 52074 Aachen, Germany

AIXTRON SE, Kaiserstraße 98, 52134 Herzogenrath, Germany

J. Photon. Energy. 4(1), 043092 (Aug 08, 2014). doi:10.1117/1.JPE.4.043092
History: Received May 14, 2014; Revised July 17, 2014; Accepted July 22, 2014
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Abstract.  This study reports on an organic solar cell structure utilizing K12 as a new low-temperature processable small-molecule acceptor material. Pentacene (PEN) and K12 were deposited onto indium tin oxide by means of organic vapor phase deposition (OVPD) as bilayer solar cells. The resulting solar cell was characterized electrically by current density-voltage (JV) measurements and optically by photocurrent and reflectivity measurements. The JV characteristic under AM 1.5 illumination indicates a short-circuit current of 0.45mA/cm2 (Jsc), a fill factor of 38% (FF), and an open-circuit (Voc) voltage of 0.71 V. Current generation is found to predominantly occur in the K12 layer, although strong light absorption in the PEN layer is detected. We suggest that either a dipole shift between the layers or the fission of singlet excitons in the PEN layer leads to this observation. Although the efficiency of the device is low in combination with PEN, our experiment successfully demonstrates the use of K12 as a low-temperature acceptor material in OVPD processes.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Sebastian Axmann ; Michael Brast ; Ajay Kumar Pandey ; Paul Burn ; Paul Meredith, et al.
"Pentacene/K12 solar cells formed by organic vapor phase deposition", J. Photon. Energy. 4(1), 043092 (Aug 08, 2014). ; http://dx.doi.org/10.1117/1.JPE.4.043092


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