Reducing Trap Density in Organic Solar Cells via Extending the Fused Ring Donor Unit of an A-D-A-Type Nonfullerene Acceptor for Over 17% Efficiency

Article Chemistry, Physical

Single-junction organic solar cells with over 19% efficiency enabled by a refined double-fibril network morphology

Lei Zhu et al.

Summary: Morphological control of donor and acceptor domains is crucial for efficient organic photovoltaics, and this study demonstrates a double-fibril network strategy to achieve a high power conversion efficiency of 19.3%.

NATURE MATERIALS (2022)

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Article Multidisciplinary Sciences

Vertically optimized phase separation with improved exciton diffusion enables efficient organic solar cells with thick active layers

Yunhao Cai et al.

Summary: This study demonstrates the fabrication of efficient thick-film organic solar cells by optimizing the structure of the active layer. The use of one polymer donor and two non-fullerene acceptors in the mixed phase enhances the exciton diffusion length, and the layer by layer approach optimizes the vertical phase separation, resulting in high photovoltaic efficiency.

NATURE COMMUNICATIONS (2022)

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Article Multidisciplinary Sciences

Small reorganization energy acceptors enable low energy losses in non-fullerene organic solar cells

Yanan Shi et al.

Summary: This study reveals the relationship between reorganization energy and energy losses by designing and synthesizing two acceptors with smaller reorganization energies, providing direction for achieving high-performance organic solar cells.

NATURE COMMUNICATIONS (2022)

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Review Chemistry, Multidisciplinary

The principles, design and applications of fused-ring electron acceptors

Jiayu Wang et al.

Summary: Fused-ring electron acceptors (FREAs) with high tunability and excellent properties have revolutionized the field of organic solar cells. FREAs have achieved remarkable efficiencies of over 20% and potential operational lifetimes of up to 10 years.

NATURE REVIEWS CHEMISTRY (2022)

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Review Chemistry, Multidisciplinary

Fused-Ring Electron Acceptors for Photovoltaics and Beyond

Jiayu Wang et al.

Summary: The emerging solar cell technologies, such as organic solar cells (OSCs) and perovskite solar cells (PSCs), are attracting attention due to advantages like easy fabrication, low cost, flexibility, and short energy payback time. The development of fused-ring electron acceptors (FREAs) has led to significant improvements in power conversion efficiencies (PCEs) of OSCs, reaching up to 18%, and has initiated a shift from fullerene-based systems to nonfullerene systems within the field.

ACCOUNTS OF CHEMICAL RESEARCH (2021)

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Article Chemistry, Multidisciplinary

An Electron Acceptor Analogue for Lowering Trap Density in Organic Solar Cells

Yihang Zhang et al.

Summary: The introduction of BTPR as a third component in organic solar cells reduces the trap density, leading to significant improvements in PCE and energy loss. This offers new possibilities for achieving higher efficiency solar cells.

ADVANCED MATERIALS (2021)

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Article Multidisciplinary Sciences

The role of charge recombination to triplet excitons in organic solar cells

Alexander J. Gillett et al.

Summary: The majority of charge recombination in organic solar cells that use NFAs occurs through non-emissive NFA triplet excitons under open-circuit conditions, reducing the open-circuit voltage. Engineering substantial hybridization between NFA triplet excitons and spin-triplet charge-transfer excitons can suppress this non-radiative recombination pathway, potentially leading to organic solar cells with power conversion efficiencies of 20% or more.

NATURE (2021)

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Article Chemistry, Multidisciplinary

Importance of molecular rigidity on reducing the energy losses in organic solar cells: implication from geometric relaxations of A-D-A electron acceptors†

Ruihong Duan et al.

Summary: Organic solar cells have seen rapid development in recent years, with power conversion efficiencies exceeding 18% thanks to the emergence of small-molecule acceptors with acceptor-donor-acceptor structures. Research shows that fused A-D-A acceptors have smaller reorganization energies for electronic transitions, reducing voltage and current losses, while longer donor unit lengths help reduce charge recombination. Designing and optimizing large fused A-D-A acceptors could further improve organic photovoltaic performance.

MATERIALS CHEMISTRY FRONTIERS (2021)

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Article Optics

High-efficiency organic solar cells with low non-radiative recombination loss and low energetic disorder

Sha Liu et al.

NATURE PHOTONICS (2020)

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Article Multidisciplinary Sciences

Resolving spatial and energetic distributions of trap states in metal halide perovskite solar cells

Zhenyi Ni et al.

SCIENCE (2020)

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Article Multidisciplinary Sciences

Delocalization of exciton and electron wavefunction in non-fullerene acceptor molecules enables efficient organic solar cells

Guichuan Zhang et al.

NATURE COMMUNICATIONS (2020)

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Article Chemistry, Multidisciplinary

Selenium Heterocyclic Electron Acceptor with Small Urbach Energy for As-Cast High-Performance Organic Solar Cells

Zhenzhen Zhang et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2020)

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Review Materials Science, Multidisciplinary

Charge carrier traps in organic semiconductors: a review on the underlying physics and impact on electronic devices

Hamna F. Haneef et al.

JOURNAL OF MATERIALS CHEMISTRY C (2020)

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Article Chemistry, Multidisciplinary

Fluorination Effects on Indacenodithienothiophene Acceptor Packing and Electronic Structure, End-Group Redistribution, and Solar Cell Photovoltaic Response

Thomas J. Aldrich et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2019)

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Editorial Material Chemistry, Physical

Pushing to the Limit: Radiative Efficiencies of Recent Mainstream and Emerging Solar Cells

Martin A. Green et al.

ACS ENERGY LETTERS (2019)

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Article Chemistry, Physical

Single-Junction Organic Solar Cell with over 15% Efficiency Using Fused-Ring Acceptor with Electron-Deficient Core

Jun Yuan et al.

JOULE (2019)

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Design rules for minimizing voltage losses in high-efficiency organic solar cells

Deping Qian et al.

NATURE MATERIALS (2018)

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Review Chemistry, Physical

Organic solar cells based on non-fullerene acceptors

Jianhui Hou et al.

NATURE MATERIALS (2018)

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Review Chemistry, Physical

Morphology Control in Organic Solar Cells

Fuwen Zhao et al.

ADVANCED ENERGY MATERIALS (2018)

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Review Nanoscience & Nanotechnology

Non-fullerene acceptors for organic solar cells

Cenqi Yan et al.

NATURE REVIEWS MATERIALS (2018)

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Article Chemistry, Physical

Direct-indirect character of the bandgap in methylammonium lead iodide perovskite

Eline M. Hutter et al.

NATURE MATERIALS (2017)

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Article Chemistry, Multidisciplinary

The Transient Localization Scenario for Charge Transport in Crystalline Organic Materials

Simone Fratini et al.

ADVANCED FUNCTIONAL MATERIALS (2016)

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An Electron Acceptor Challenging Fullerenes for Efficient Polymer Solar Cells

Yuze Lin et al.

ADVANCED MATERIALS (2015)

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Article Chemistry, Physical

Static and Dynamic Energetic Disorders in the C60, PC61 BM, C70, and PC71BM Fullerenes

Naga Rajesh Tummala et al.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2015)

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Trap- Limited Exciton Diffusion in Organic Semiconductors

Oleksandr V. Mikhnenko et al.

ADVANCED MATERIALS (2014)

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Approaching disorder-free transport in high-mobility conjugated polymers

Deepak Venkateshvaran et al.

NATURE (2014)

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Ternary blend polymer solar cells with enhanced power conversion efficiency

Luyao Lu et al.

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Origin and elimination of photocurrent hysteresis by fullerene passivation in CH3NH3PbI3 planar heterojunction solar cells

Yuchuan Shao et al.

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Vibration-Assisted Crystallization Improves Organic/Dielectric Interface in Organic Thin-Film Transistors

Peter J. Diemer et al.

ADVANCED MATERIALS (2013)

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Review Chemistry, Multidisciplinary

The identification, characterization and mitigation of defect states in organic photovoltaic devices: a review and outlook

John A. Carr et al.

ENERGY & ENVIRONMENTAL SCIENCE (2013)

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Doping of organic semiconductors

B. Luessem et al.

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE (2013)

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Thermo-cleavable fullerene materials as buffer layers for efficient polymer solar cells

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JOURNAL OF MATERIALS CHEMISTRY A (2013)

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Differential Resistance Analysis of Charge Carrier Losses in Organic Bulk Heterojunction Solar Cells: Observing the Transition from Bimolecular to Trap-Assisted Recombination and Quantifying the Order of Recombination

Wei Lin Leong et al.

ADVANCED ENERGY MATERIALS (2011)

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Trap density of states in small-molecule organic semiconductors: A quantitative comparison of thin-film transistors with single crystals

Wolfgang L. Kalb et al.

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Recombination in polymer-fullerene bulk heterojunction solar cells

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Solution-Grown, Macroscopic Organic Single Crystals Exhibiting Three-Dimensional Anisotropic Charge-Transport Properties

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Large modulation of carrier transport by grain-boundary molecular packing and microstructure in organic thin films

Jonathan Rivnay et al.

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Reciprocity relation between photovoltaic quantum efficiency and electroluminescent emission of solar cells

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Charge transport in organic semiconductors

Veaceslav Coropceanu et al.

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Reducing Trap Density in Organic Solar Cells via Extending the Fused Ring Donor Unit of an A-D-A-Type Nonfullerene Acceptor for Over 17% Efficiency

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