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Open-circuit voltage of organic solar cells: interfacial roughness makes the difference

Engineering and Technology

Open-circuit voltage of organic solar cells: interfacial roughness makes the difference

C. Poelking, J. Benduhn, et al.

Discover how recent research by Carl Poelking and colleagues reveals an innovative electrostatic model that addresses the challenges of organic photovoltaics. Their findings highlight how electrostatic bias can diminish the photovoltaic gap, paving the way for enhanced efficiencies in solar power.

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Playback language: English
Abstract
Organic photovoltaics (PV) offer advantages like flexibility, low weight and cost, and environmentally benign materials. Despite power conversion efficiencies reaching around 19%, they lag behind inorganic PVs due to high open-circuit voltage (Voc) losses. This paper presents an electrostatic model of a rough donor-acceptor interface, experimentally tested on small molecule PV materials. The model links Voc, photovoltaic gap, charge-transfer state energy, and interfacial morphology, showing that electrostatic bias reduces the photovoltaic gap. However, this negative effect on Voc can be mitigated by adjusting the donor-acceptor interface morphology.
Publisher
Communications Physics
Published On
Nov 29, 2022
Authors
Carl Poelking, Johannes Benduhn, Donato Spoltore, Martin Schwarze, Steffen Roland, Fortunato Piersimoni, Dieter Neher, Karl Leo, Koen Vandewal, Denis Andrienko
Tags
Organic photovoltaics
Power conversion efficiency
Electrostatic model
Donor-acceptor interface
Voc losses
Charge-transfer state
Interfacial morphology

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