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Open AccessDecreasing exciton dissociation rates for reduced voltage losses in organic solar cells
Enhancing the device electroluminescence quantum efficiency (EQEEL) is a critical factor in mitigating non-radiative voltage losses (VNR) and further improving the performance of organic solar cells (OSCs). While...
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Article
Open AccessOrigins of the open-circuit voltage in ternary organic solar cells and design rules for minimized voltage losses
The power conversion efficiency of ternary organic solar cells (TOSCs), consisting of one host binary blend and one guest component, remains limited by large voltage losses. The fundamental understanding of th...
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Article
Open AccessMid-gap trap state-mediated dark current in organic photodiodes
Photodiodes are ubiquitous in industry and consumer electronics. Constantly emerging new applications for photodiodes demand different mechanical and optoelectronic properties from those provided by convention...
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Article
Open AccessOpen-circuit voltage of organic solar cells: interfacial roughness makes the difference
Organic photovoltaics (PV) is an energy-harvesting technology that offers many advantages, such as flexibility, low weight and cost, as well as environmentally benign materials and manufacturing techniques. De...
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Article
Open AccessElectron-donating amine-interlayer induced n-type do** of polymer:nonfullerene blends for efficient narrowband near-infrared photo-detection
Inherently narrowband near-infrared organic photodetectors are highly desired for many applications, including biological imaging and surveillance. However, they suffer from a low photon-to-charge conversion e...
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Open AccessIncreasing donor-acceptor spacing for reduced voltage loss in organic solar cells
The high voltage losses ( \({V}_{{loss}}\) V ...
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Article
Open AccessEnhancing sub-bandgap external quantum efficiency by photomultiplication for narrowband organic near-infrared photodetectors
Detection of electromagnetic signals for applications such as health, product quality monitoring or astronomy requires highly responsive and wavelength selective devices. Photomultiplication-type organic photo...
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Article
Open AccessReverse dark current in organic photodetectors and the major role of traps as source of noise
Organic photodetectors have promising applications in low-cost imaging, health monitoring and near-infrared sensing. Recent research on organic photodetectors based on donor–acceptor systems has resulted in na...
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Article
Open AccessThe role of spin in the degradation of organic photovoltaics
Stability is now a critical factor in the commercialization of organic photovoltaic (OPV) devices. Both extrinsic stability to oxygen and water and intrinsic stability to light and heat in inert conditions mus...
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Article
Open AccessOrientation dependent molecular electrostatics drives efficient charge generation in homojunction organic solar cells
Organic solar cells usually utilise a heterojunction between electron-donating (D) and electron-accepting (A) materials to split excitons into charges. However, the use of D-A blends intrinsically limits the p...
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Open AccessAuthor Correction: Molecular vibrations reduce the maximum achievable photovoltage in organic solar cells
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
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Article
Open AccessMolecular vibrations reduce the maximum achievable photovoltage in organic solar cells
The low-energy edge of optical absorption spectra is critical for the performance of solar cells, but is not well understood in the case of organic solar cells (OSCs). We study the microscopic origin of excito...
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Article
Open AccessSub-picosecond charge-transfer at near-zero driving force in polymer:non-fullerene acceptor blends and bilayers
Organic photovoltaics based on non-fullerene acceptors (NFAs) show record efficiency of 16 to 17% and increased photovoltage owing to the low driving force for interfacial charge-transfer. However, the low dri...
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Article
Open AccessStrong light-matter coupling for reduced photon energy losses in organic photovoltaics
Strong light-matter coupling can re-arrange the exciton energies in organic semiconductors. Here, we exploit strong coupling by embedding a fullerene-free organic solar cell (OSC) photo-active layer into an op...
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Open AccessImpact of molecular quadrupole moments on the energy levels at organic heterojunctions
The functionality of organic semiconductor devices crucially depends on molecular energies, namely the ionisation energy and the electron affinity. Ionisation energy and electron affinity values of thin films ...
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Article
Emissive and charge-generating donor–acceptor interfaces for organic optoelectronics with low voltage losses
Intermolecular charge-transfer states at the interface between electron donating (D) and accepting (A) materials are crucial for the operation of organic solar cells but can also be exploited for organic light...
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Article
Open AccessDegradation pathways in standard and inverted DBP-C70 based organic solar cells
Achieving long-term stability in organic solar cells is a remaining bottleneck for the commercialization of this otherwise highly appealing technology. In this work, we study the performance and stability diff...
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Article
Molecular parameters responsible for thermally activated transport in doped organic semiconductors
Doped organic semiconductors typically exhibit a thermal activation of their electrical conductivity, whose physical origin is still under scientific debate. In this study, we disclose relationships between mo...
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Open AccessPublisher Correction: Elementary steps in electrical do** of organic semiconductors
The original version of this Article contained an error in Equation 1. A factor of ‘c’ was included in the right-hand term. This has been corrected in the PDF and HTML versions of the Article.
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Article
Open AccessElementary steps in electrical do** of organic semiconductors
Fermi level control by do** is established since decades in inorganic semiconductors and has been successfully introduced in organic semiconductors. Despite its commercial success in the multi-billion OLED d...
