Organic Optoelectronic Materials: Mechanisms and Applications

Chemical Reviews, Год журнала: 2016, Номер 116(22), С. 13279 - 13412

Опубликована: Окт. 10, 2016

Organic (opto)electronic materials have received considerable attention due to their applications in thin-film-transistors, light-emitting diodes, solar cells, sensors, photorefractive devices, and many others. The technological promises include low cost of these the possibility room-temperature deposition from solution on large-area and/or flexible substrates. article reviews current understanding physical mechanisms that determine properties high-performance organic materials. focus review is photoinduced processes electronic important for optoelectronic relying charge carrier photogeneration. Additionally, it highlights capabilities various experimental techniques characterization materials, summarizes top-of-the-line device performance, outlines recent trends further development field. based both small molecules conjugated polymers are considered, photodetectors, devices discussed.

Язык: Английский

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Recent progress and perspective in solution-processed Interfacial materials for efficient and stable polymer and organometal perovskite solar cells

Energy & Environmental Science, Год журнала: 2015, Номер 8(4), С. 1160 - 1189

Опубликована: Янв. 1, 2015

The latest developments in solution-processed interfacial layers for polymer and hybrid perovskite solar cells are comprehensively reviewed this article.

Язык: Английский

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Light Harvesting for Organic Photovoltaics

Chemical Reviews, Год журнала: 2016, Номер 117(2), С. 796 - 837

Опубликована: Дек. 7, 2016

The field of organic photovoltaics has developed rapidly over the last 2 decades, and small solar cells with power conversion efficiencies 13% have been demonstrated. Light absorbed in layers forms tightly bound excitons that are split into free electrons holes using heterojunctions electron donor acceptor materials, which then extracted at electrodes to give useful electrical power. This review gives a concise description fundamental processes photovoltaic devices, main emphasis on characterization energy transfer its role dictating device architecture, including multilayer planar heterojunctions, factors impact carrier generation from dissociated excitons. We briefly discuss harvesting triplet excitons, now attracts substantial interest when used conjunction singlet fission. Finally, we introduce techniques by researchers for engineering bulk realize large photocurrents, examine formed morphology three prototypical blends.

Язык: Английский

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Eco‐Compatible Solvent‐Processed Organic Photovoltaic Cells with Over 16% Efficiency

Advanced Materials, Год журнала: 2019, Номер 31(39)

Опубликована: Авг. 8, 2019

Abstract Recent advances in nonfullerene acceptors (NFAs) have enabled the rapid increase power conversion efficiencies (PCEs) of organic photovoltaic (OPV) cells. However, this progress is achieved using highly toxic solvents, which are not suitable for scalable large‐area processing method, becoming one biggest factors hindering mass production and commercial applications OPVs. Therefore, it great importance to get good eco‐compatible processability when designing efficient OPV materials. Here, achieve high efficiency NFAs flexible alkyl chains NFA BTP‐4F‐8 (also known as Y6) modified BTP‐4F‐12 synthesized. Combining with polymer donor PBDB‐TF, shows best PCE 16.4%. Importantly, PBDB‐TF replaced by T1 better solubility, various solvents can be applied fabricate Finally, over 14% obtained tetrahydrofuran (THF) solvent 1.07 cm 2 cells blade‐coating method. These results indicate that simple modification side chain used tune active layer materials thus make more applicable environmentally benign solvents.

Язык: Английский

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Small is Powerful: Recent Progress in Solution‐Processed Small Molecule Solar Cells

Advanced Energy Materials, Год журнала: 2017, Номер 7(10)

Опубликована: Янв. 9, 2017

Over the last 5 years, research on synthesis, device engineering, and physics of solution‐processed small molecule solar cells (SMSCs) has rapidly expanded. Improvements in molecular design emergent processing techniques have helped SMSCs overcome earlier difficulties controlling active layer morphology, such that many systems are now at—or approaching—10% power conversion efficiency. In this review, details highest performing blend presented order to identify key trends provide perspective current progress field. Among best systems, a planarized structure is prevalent, which can be achieved using large fused‐ring moieties, intermolecular non‐bonding interactions, side chain engineering. To obtain efficient devices, been optimized through careful combination thermal solvent annealing procedures. Even without additional processing, some able interconnected morphologies charge generation transport. Ultimately, more materials also requires understanding loss mechanisms. After highlighting what known date processes limiting efficiency, an outlook most important challenges remaining field provided.

Язык: Английский

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Improved Charge Transport and Reduced Nonradiative Energy Loss Enable Over 16% Efficiency in Ternary Polymer Solar Cells

Advanced Materials, Год журнала: 2019, Номер 31(36)

Опубликована: Июль 11, 2019

Recent advances in the material design and synthesis of nonfullerene acceptors (NFAs) have revealed a new landscape for polymer solar cells (PSCs) boosted power conversion efficiencies (PCEs) to over 15%. Further improvements photovoltaic performance are significant challenge NFA-PSCs based on binary donor:acceptor blends. In this study, ternary PSCs fabricated by incorporating fullerene derivative, PC61 BM, into combination donor (PBDB-TF) fused-ring NFA (Y6) very high PCE 16.5% (certified as 16.2%) is recorded. Detailed studies suggest that loading BM PBDB-TF:Y6 blend can not only enhance electron mobility but also increase electroluminescence quantum efficiency, leading balanced charge transport reduced nonradiative energy losses simultaneously. This work suggests utilizing complementary advantages NFAs promising way finely tune detailed parameters further improve PCEs PSCs.

Язык: Английский

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Breaking the 10% Efficiency Barrier in Organic Photovoltaics: Morphology and Device Optimization of Well‐Known PBDTTT Polymers

Advanced Energy Materials, Год журнала: 2016, Номер 6(11)

Опубликована: Март 7, 2016

With the advances in organic photovoltaics (OPVs), invention of model polymers with superior properties and wide applicability is vital importance to both academic industrial communities. The recent inspiring OPV research have included emergence poly(benzodithiophene‐co‐thieno[3,4‐b]thiophene) (PBDTTT)‐based materials. Through combined efforts on PBDTTT polymers, over 10% efficiencies been realized recently various types devices. This review attempts critically summarize respect five well‐known their design considerations, basic properties, photovoltaic performance, as well device application conventional, inverted, tandem solar cells. These also make great contributions rapid field emerging ternary blends fullerene‐free OPVs top performances. Addtionally, new challenges developing novel more are prospected. More importantly, highly efficient PBDTTT‐based provides useful insights builds fundamentals for applications architectures.

Язык: Английский

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Exciton Diffusion in Conjugated Polymers: From Fundamental Understanding to Improvement in Photovoltaic Conversion Efficiency

The Journal of Physical Chemistry Letters, Год журнала: 2015, Номер 6(17), С. 3417 - 3428

Опубликована: Авг. 13, 2015

Singlet exciton diffusion plays a central role in the photovoltaic conversion organic photovoltaics (OPVs). Upon light absorption, singlet excitons are promptly generated materials instead of charge carriers because dielectric constant (εr) is small (∼3–4), which sharp contrast to inorganic and perovskite solar cells. In order convert carriers, need diffuse into an interface between electron donor acceptor before deactivating ground state. Therefore, fundamental understanding dynamics one most important issues further improve OPVs. We highlight recent leading studies this field describe several approaches for efficient harvesting at

Язык: Английский

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Manipulating Aggregation and Molecular Orientation in All‐Polymer Photovoltaic Cells

Advanced Materials, Год журнала: 2015, Номер 27(39), С. 6046 - 6054

Опубликована: Авг. 28, 2015

Manipulating molecular orientation at the donor/acceptor interface is key to boosting charge separation properties and efficiencies of anisotropic-materials-based organic photovoltaics (OPVs). By replacing polymeric donor PBDTBDD with its 2D-conjugated polymer PBDTBDD-T, power conversion efficiency OPVs featuring anisotropic acceptor PNDI drastically boosted from 2.4% up 5.8%.

Язык: Английский

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Fundamentals of bulk heterojunction organic solar cells: An overview of stability/degradation issues and strategies for improvement

Renewable and Sustainable Energy Reviews, Год журнала: 2017, Номер 84, С. 43 - 53

Опубликована: Дек. 29, 2017

Язык: Английский

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