Quantum Dot Applications in Photovoltaic Devices
Summary
Quantum dots (QDs) are nanometre-scale semiconductor particles whose size-dependent electronic and optical properties arise from quantum confinement. In photovoltaic devices, QDs provide tunable absorption across the visible and near-infrared spectrum, high extinction coefficients and the potential for multiple exciton generation. These features have inspired diverse device architectures, including quantum dot-sensitised solar cells, organic photovoltaics and bulk heterojunction devices. Integration of QDs can extend light harvesting, facilitate directional charge transfer through engineered energy levels and improve photostability via surface passivation. Metal-free carbon QDs further enable environmentally benign ‘green’ photovoltaics. Recent advances centre on precision surface engineering, heteroatom doping and composite nanostructures to suppress recombination, enhance interfacial coupling and drive power conversion efficiencies towards commercially relevant levels. Collectively, these developments underscore the global significance of QDs in next-generation solar energy conversion.
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Quantum Dot Applications in Photovoltaic Devices publication trend
The graph below shows the total number of articles in quantum dot applications in photovoltaic devices across all publications each year (not limited to Nature Index journals).
Technical terms
Quantum dot: A nanometre-scale semiconductor particle exhibiting size-dependent optical and electronic properties due to quantum confinement.
Exciton: A bound electron–hole pair generated by photon absorption within a semiconductor.
Band gap: The energy difference between the valence band and conduction band that determines the threshold for photon absorption.
Power conversion efficiency: The ratio of electrical power output to incident solar power input in a photovoltaic device.
Dye-sensitised solar cell: A device in which a photosensitiser, such as a dye or QD, absorbs photons on a semiconductor scaffold, generating excitons for charge separation.
Förster resonance energy transfer (FRET): A non-radiative mechanism of energy transfer between a donor and an acceptor chromophore via dipole–dipole coupling.
References
- Nitrogen-Doped Carbon Dots for “green” Quantum Dot Solar Cells. Discover Nano (2016).
- Environmentally friendly nitrogen-doped carbon quantum dots for next generation solar cells. Sustainable Energy & Fuels (2017).
- Enhancing the short-circuit current and power conversion efficiency of polymer solar cells with graphene quantum dots derived from double-walled carbon nanotubes. NPG Asia Materials (2013).
- The Role of Carbon Quantum Dots in Organic Photovoltaics: A Short Overview. Coatings (2021).
- Precise Surface State Control of Carbon Quantum Dots to Enhance Charge Extraction for Solar Cells. Nanomaterials (2020).
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