Nicola Gasparini

Imperial College London

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Derya Baran

King Abdullah University of Science and Technology

Christoph J. Brabec

Friedrich-Alexander-Universität Erlangen-Nürnberg

Iain McCulloch

University of Oxford

Andrew Wadsworth

University of Oxford

Tayebeh Ameri

Ludwig-Maximilians-Universität München

Martin Heeney

King Abdullah University of Science and Technology

Christos L. Chochos

National Hellenic Research Foundation

Francesco Furlan

Imperial College London

James R. Durrant

Imperial College London

Zhuoran Qiao

Imperial College London

Cooperative Institutions

Imperial College London

173

King Abdullah University of Science and Technology

138

Georgia Institute of Technology

134

Royal Society of Chemistry

121

Northwestern University

116

Cambridge Consultants (United Kingdom)

112

Institut de Recherche Interdisciplinaire de Grenoble

110

University of London

108

Pohang University of Science and Technology

103

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A universal solution processed interfacial bilayer enabling ohmic contact in organic and hybrid optoelectronic devices

Energy & Environmental Science (2019)

Joel Troughton Marios Neophytou Nicola Gasparini Akmaral Seitkhan Furkan H. Isikgor

A bilayer of Nb-TiO₂ and bathocuproine forms a highly ohmic contact between a wide variety of semiconducting materials and metal electrodes. This enables performance and stability improvements in a range of electronic devices.

Ohmic contact

Contact resistance

10.1039/c9ee02202c

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Citations (54)

Dual Sensitizer and Processing-Aid Behavior of Donor Enables Efficient Ternary Organic Solar Cells

Joule (2019)

Xin Song Nicola Gasparini Masrur Morshed Nahid Sri Harish Kumar Paleti Jin‐Liang Wang

10.1016/j.joule.2019.01.009

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Citations (85)

Octupole Moment Driven Free Charge Generation in Efficient Planar Heterojunction Organic Photodetectors

Aniket Rana Song-Yi Park Chiara Labanti Yifan Dong Emily Yang

Octupole Moment Driven Free Charge Generation in Efficient Planar Heterojunction Organic PhotodetectorsAniket Rana a, Song-Yi Park b, Chiara Labanti b, Yifan Dong d, Emily Yang b, Nicola Gasparini a, Ji-Seon Kim b, James R Durrant a, ca Department of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, UKb Department of Physics and Centre for Processable Electronics, Imperial College London, London SW7 2AZ, UKc SPECIFIC, Faculty of Science and Engineering, Swansea University, Swansea, SA1 8EN, UK.d National Renewable Energy Laboratory, 15013 Denver W Pkwy, Golden, CO 80401, United StatesMaterials for Sustainable Development Conference (MATSUS)Proceedings of MATSUS Spring 2024 Conference (MATSUS24)#NextGenPD - Next Generation Photo-and-radiation detectorsBarcelona, Spain, 2024 March 4th - 8thOrganizers: Ardalan Armin and Nicola GaspariniOral, Aniket Rana, presentation 229DOI: https://doi.org/10.29363/nanoge.matsus.2024.229Publication date: 18th December 2023Planner hetero-junction (PHJ) structure is one of the key device fabrication strategies to increase specific detectivity by reducing dark current in organic photodiodes (OPDs). We demonstrated that efficient free charge generation in partially chlorinated subphthalocyanine molecules (Cl6-SubPc) can assist PHJ OPDs to achieve detectivity up to 1013 Jones and dark current below 10-7 A cm-2 up to -5 V. The photophysical analysis of Cl6-SubPc based devices clearly show that device photocurrent is primarily generated through direct charge generation within the Cl6-SubPc layer, rather than exciton separation at layer interfaces. Molecular modelling suggests that direct charge generation is facilitated by Cl6-SubPc's high octupole moment which generates a shift in molecular energetics [1,2] (Fig(1(a)). Also, lower trap densities analysed from capacitance-frequency response [3] in thick PHJ device helps in further minimising leakage currents as shown in Fig(1(b)). In summary, this study provides clear indication that Cl6-SubPc is promising material for single component OPD devices. References:[1] Dong, Y. et al. Orientation dependent molecular electrostatics drives efficient charge generation in homojunction organic solar cells. Nature Communications. 2020 11, 1–9.[2] Fu, Y. et al. Molecular orientation-dependent energetic shifts in solution-processed non-fullerene acceptors and their impact on organic photovoltaic performance. Nature Communications 2023,14, 1–12.[3] Rana, A., Kumar, A., Chand, S. & Singh, R. K. Exploring deep defect state impact on open circuit voltage of conventional and inverted organic solar cells. J Appl Phys. 2018,124, 10310.Acknowledgements:We thank Samsung Electronics for the project funding and the UK EPSRC for ATIP program grant (EP/T028513/1) and Centre for Doctoral Training in Plastic Electronics (EP/L016702/1). © FUNDACIO DE LA COMUNITAT VALENCIANA SCITOnanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.nanoGe Fall MeetingnanoGe Fall Meeting (NFM) is a multiple symposia conference celebrated yearly and focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.nanoGe Spring MeetingThis conference is a unique series of symposia focused on advanced materials preparation and fundamental properties and their applications, in fields such as renewable energy (photovoltaics, batteries), lighting, semiconductor quantum dots, 2-D materials synthesis and semiconductors fundamentals, bioimaging, etc.International Conference on Hybrid and Organic PhotovoltaicsInternational Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and OptoelectronicsThe main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and OptoelectronicsThe International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

10.29363/nanoge.matsus.2024.229

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Improved charge carrier dynamics in polymer/perovskite nanocrystal based hybrid ternary solar cells

Physical Chemistry Chemical Physics (2018)

Rezvan Soltani Bianka M. D. Puscher Ali Asghar Katbab Ievgen Levchuk Negar Kazerouni

Here, brand new ternary hybrid solar cells comprising perovskite nanocrystals (NCs) with a complementary absorption profile of the organic host matrix are reported. In particular, NH2CH[double bond, length as m-dash]NH2PbI3 (FAPbI3) perovskite NCs are implemented in bulk heterojunction organic solar cells based on the pDPP5T-2 electron donating polymer and a [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) acceptor at various loading amounts and the fabricated hybrid photovoltaics are thoroughly studied by employing different optoelectrical characterization methods. Current-voltage measurements and photoinduced charge carrier extraction by linear increasing voltage (photo-CELIV) reveal improved charge generation and charge transport properties upon incorporation of perovskite NCs into the photo-active layer of the hybrid solar cell. The power conversion efficiency (PCE) of the hybrid solar cell comprising 5% perovskite NCs is 10% enhanced compared to the organic reference, mainly due to the enlarged light harvesting and increased short circuit current density (Jsc). However, results suggest that introducing a higher amount of perovskite content induces bimolecular and trap-assisted recombination in the ternary devices. We perform a comprehensive transient absorption study of the charge transfer/transport mechanisms by employing femto-second pump-probe transient absorption spectroscopy (fs-TAS). fs-TAS measurements demonstrate a slower charge carrier recombination rate due to the introduction of perovskite NCs into the photoactive layer. Results reveal that DPP injects electrons from the singlet excited state into the perovskite NCs, which causes the desired cascading charge carrier transfer. In ternary blends, a small amount of FAPbI3 NCs provides an additional pathway in favor of the charge-separated state via the NCs, which, despite accelerating the depopulation of DPP's singlet excited state slightly slows down the charge-separation process between DPP and PC61BM. Interestingly, the loss processes are slowed down; an effect that is more important and, hence, explains the improved solar cell efficiency.

Photoactive layer

Hybrid solar cell

Charge carrier

10.1039/c8cp03743d

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Citations (14)

Panchromatic ternary/quaternary polymer/fullerene BHJ solar cells based on novel silicon naphthalocyanine and silicon phthalocyanine dye sensitizers

Journal of Materials Chemistry A (2016)

Lili Ke Nicola Gasparini Jie Min Hong Zhang Matthias Adam

SiNC-1is successfully applied in ternary/quaternary devices, accompanied by charge transfer/transport mechanism studies.

Panchromatic film

10.1039/c6ta08729a

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Citations (36)

Propylene and butylene glycol: new alternatives to ethylene glycol in conjugated polymers for bioelectronic applications

Materials Horizons (2021)

Maximilian Moser Yazhou Wang Tania C. Hidalgo Hailiang Liao Yaping Yu

Propylene and butylene glycol oligoether chains have been employed as alternatives to ethylene glycol in thiophene based semiconductors for OECTs. Their impact on electrochemical, microstructure, and swelling properties are discussed.

Polyvinyl Alcohol

10.1039/d1mh01889b

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Citations (35)

Adjusting the energy of interfacial states in organic photovoltaics for maximum efficiency

Nature Communications (2021)

Nicola Gasparini Franco V. A. Camargo Stefan Frühwald Tetsuhiko Nagahara Andrej Classen

Abstract A critical bottleneck for improving the performance of organic solar cells (OSC) is minimising non-radiative losses in the interfacial charge-transfer (CT) state via the formation of hybrid energetic states. This requires small energetic offsets often detrimental for high external quantum efficiency (EQE). Here, we obtain OSC with both non-radiative voltage losses (0.24 V) and photocurrent losses (EQE > 80%) simultaneously minimised. The interfacial CT states separate into free carriers with ≈40-ps time constant. We combine device and spectroscopic data to model the thermodynamics of charge separation and extraction, revealing that the relatively high performance of the devices arises from an optimal adjustment of the CT state energy, which determines how the available overall driving force is efficiently used to maximize both exciton splitting and charge separation. The model proposed is universal for donor:acceptor (D:A) with low driving forces and predicts which D:A will benefit from a morphology optimization for highly efficient OSC.

Photocurrent

Quantum Efficiency

Acceptor

Charge carrier

10.1038/s41467-021-22032-3

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Integrated molecular, morphological and interfacial engineering towards highly efficient and stable solution-processed small molecule solar cells

Journal of Materials Chemistry A (2015)

Jie Min Yuriy N. Luponosov Nicola Gasparini Ling‐Wei Xue Fedor V. Drozdov

High-performance small molecule OSCs with PCEs up to 6.4% are demonstrated.

10.1039/c5ta06706e

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Citations (27)

Roadmap on Photovoltaic Absorber Materials for Sustainable Energy Conversion

arXiv (Cornell University) (2023)

James C. Blakesley Ruy S. Bonilla Marina Freitag Alex M. Ganose Nicola Gasparini

Photovoltaics (PVs) are a critical technology for curbing growing levels of anthropogenic greenhouse gas emissions, and meeting increases in future demand for low-carbon electricity. In order to fulfil ambitions for net-zero carbon dioxide equivalent (CO₂eq) emissions worldwide, the global cumulative capacity of solar PVs must increase by an order of magnitude from 0.9 TWp in 2021 to 8.5 TWp by 2050 according to the International Renewable Energy Agency, which is considered to be a highly conservative estimate. In 2020, the Henry Royce Institute brought together the UK PV community to discuss the critical technological and infrastructure challenges that need to be overcome to address the vast challenges in accelerating PV deployment. Herein, we examine the key developments in the global community, especially the progress made in the field since this earlier roadmap, bringing together experts primarily from the UK across the breadth of the photovoltaics community. The focus is both on the challenges in improving the efficiency, stability and levelized cost of electricity of current technologies for utility-scale PVs, as well as the fundamental questions in novel technologies that can have a significant impact on emerging markets, such as indoor PVs, space PVs, and agrivoltaics. We discuss challenges in advanced metrology and computational tools, as well as the growing synergies between PVs and solar fuels, and offer a perspective on the environmental sustainability of the PV industry. Through this roadmap, we emphasize promising pathways forward in both the short- and long-term, and for communities working on technologies across a range of maturity levels to learn from each other.

10.48550/arxiv.2310.19430

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Citations (3)

Excitation Wavelength-Dependent Internal Quantum Efficiencies in a P3HT/Nonfullerene Acceptor Solar Cell

The Journal of Physical Chemistry C (2018)

Ching‐Hong Tan Andrew Wadsworth Nicola Gasparini Scot Wheeler Sarah Holliday

Solar cells based on blends of the donor polymer, P3HT, with the nonfullerene acceptor, O-IDTBR, have been shown to exhibit promising efficiencies and stabilities for low-cost organic photovoltaic devices. We focus herein on the charge separation and recombination dynamics in such devices. By employing selective wavelength excitations of P3HT and O-IDTBR, we show that photoexcitation of P3HT results in lower internal quantum efficiency (IQE) for photocurrent generation than that observed for photoexcitation of O-IDTBR. Transient absorption and photoluminescence quenching studies indicate that this lower IQE results primarily from higher geminate recombination losses of photogenerated charges following P3HT excitation compared with O-IDTBR excitation, rather than from differences in exciton separation efficiency. These higher geminate recombination losses result in lower photocurrent generation efficiency at short circuit upon selective excitation of the P3HT donor, when compared with O-IDTBR excitation.

Photoexcitation

Photocurrent

Quantum Efficiency

Acceptor

10.1021/acs.jpcc.8b10918

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Citations (7)