A Wide-Bandgap Donor Polymer for Highly Efficient Non-fullerene Organic Solar Cells with a Small Voltage Loss

Chen, Shangshang; Liu, Yuhang; Zhang, Lin; Chow, Philip C. Y.; Wang, Zheng; Zhang, Guangye; Ma, Wei; Yan, He

doi:10.1021/jacs.7b01606

Cited by 334 publications

(252 citation statements)

References 38 publications

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“…[27,30,46] The molecular energy levels of the donor and acceptors were measured in parallel via square wave electrochemical voltammetry and cyclic voltammetry ( Figure S2, Supporting Information). As shown in Figure 1b According to the reported literature, [47][48][49][50][51][52] the HOMO and LUMO offsets between the donor and the acceptors can meet the requirement for exciton dissociation in NF-OSCs. As shown in Figure 1b According to the reported literature, [47][48][49][50][51][52] the HOMO and LUMO offsets between the donor and the acceptors can meet the requirement for exciton dissociation in NF-OSCs.…”

Section: Organic Solar Cellsmentioning

confidence: 96%

A High‐Efficiency Organic Solar Cell Enabled by the Strong Intramolecular Electron Push–Pull Effect of the Nonfullerene Acceptor

et al. 2018

Advanced Materials

372

287

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Besides broadening of the absorption spectrum, modulating molecular energy levels, and other well-studied properties, a stronger intramolecular electron push-pull effect also affords other advantages in nonfullerene acceptors. A strong push-pull effect improves the dipole moment of the wings in IT-4F over IT-M and results in a lower miscibility than IT-M when blended with PBDB-TF. This feature leads to higher domain purity in the PBDB-TF:IT-4F blend and makes a contribution to the better photovoltaic performance. Moreover, the strong push-pull effect also decreases the vibrational relaxation, which makes IT-4F more promising than IT-M in reducing the energetic loss of organic solar cells. Above all, a power conversion efficiency of 13.7% is recorded in PBDB-TF:IT-4F-based devices.

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Section: Organic Solar Cellsmentioning

confidence: 96%

A High‐Efficiency Organic Solar Cell Enabled by the Strong Intramolecular Electron Push–Pull Effect of the Nonfullerene Acceptor

et al. 2018

Advanced Materials

372

287

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“…[55] Copyright 2016, Wiley-VCH.d )T emperature-dependent absorptions pectra of PBDB-T.The inset photographs show that solution is clear and that the temperature-dependentcolor change is reversible. [86] Copyright 2017, AmericanC hemical Society.i )2D GIWAXS maps of pure PTFB-P and PTFB-O films. [62] Copyright 2017, Macmillan Publishers Ltd. e) Current density-voltage curve of high-PCE (ca.…”

Section: Polythiophene Derivativesmentioning

confidence: 99%

Polymer Donors for High‐Performance Non‐Fullerene Organic Solar Cells

2019

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Over the past three years, non-fullerene (NF) organic solar cells (OSCs) have been a focus of research and their power conversion efficiencies have been improved dramatically from ~6% to over 14%. In addition to innovations in NF acceptors, the ongoing development of polymer donors has contributed significantly to the rapid progress of NF OSC performance. This review highlights the polymer donors that enable high-performance NF OSCs. We first review the impressive photovoltaic devices results achieved by some of important classes of conjugated polymer systems in NF OSCs. Then, we discuss molecular design strategies as far as developing matching polymer donors for NF acceptors. Finally, we conclude with a brief summary and outlook for advances in donor polymers to fulfill future commercialization.

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“…[41] On the contrary, the as-spun SiOTIC-4F tends to adopt a face-on orientation with a high-intensity peak (010) located at q z = 1.82 Å −1 . We speculate that the donor and acceptor components maintain their crystalline features, [43,44] as well as part of the components being reorganized into mixed phases in the BHJ blends. The optimized blend films for both NFAs show a preferential face-on orientation (Figure 4a), which is beneficial for efficient charge transport in the vertical direction between the electrodes.…”

mentioning

confidence: 95%

Bandgap Narrowing in Non‐Fullerene Acceptors: Single Atom Substitution Leads to High Optoelectronic Response Beyond 1000 nm

Lee

Seifrid

et al. 2018

Advanced Energy Materials

151

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absorption spectra extending to the NIR region have been designed and applied to the fabrication of OSCs. [6][7][8] A critical challenge arises as one decreases optical bandgaps (E g opt ) with respect to simultaneously achieving a high external quantum efficiency (EQE) and high open-circuit voltage (V OC ). [9] This challenge is due to the counterbalance between the driving force for charge separation, which aids in photocurrent generation, and voltage loss in the cell. [10,11] Finding ways to maximize V OC requires one to reduce the energy loss (E loss = E g opt -eV OC ) that occurs as a result of the multiple states that follow exciton generation. [12] Narrow bandgap (NBG) non-fullerene acceptors (NFAs) have emerged as the next generation of electron acceptors in OSCs. [13][14][15][16][17][18] Tunability of E g opt through molecular design allows one to tailor NIR absorption characteristics. [19,20] Considering that the maximum human photopic sensitivity is 555 nm and the maximum human scotopic sensitivity is 507 nm, [21] transparent photoactive materials should predominantly absorb solar radiation from ≈650 nm into the NIR region for semitransparent solar cell applications. In addition, since ≈50% of solar radiation intensity is in the NIR region, the development of NBG-NFAs with E g opt below ≈1.35 eV is desirable to effectively harvest solar NIR radiation. [1] Another encouraging feature of NFAs is that the energetic offsets that drive charge generation are small (<0.3 eV), [18,[22][23][24] which is beneficial for maintaining low E loss . Despite these desirable features, there has been less consideration for designing NBG-NFAs for transparent/NIR absorbing OSC applications. To address this challenge and expand the design of NIR harvesting acceptor molecules, we demonstrate in this contribution a new molecular design for ultra NBG-NFA materials with strong NIR response and small E loss .The two NBG NFAs described in this contribution are COTIC-4F and SiOTIC-4F (Figure 1a). Their molecular design includes incorporation of a cyclopentadithiophene (CPDT), or dithienosilole (DTS), unit as the central donor (D) fragment, which is flanked by two alkoxythienyl units (D′) to form an electron-rich D′-D-D′ central core. The D′-D-D′ units are end-capped with Two narrow bandgap non-fullerene acceptors (NBG-NFAs), namely, COTIC-4F and SiOTIC-4F, are designed and synthesized for the fabrication of efficient near-infrared organic solar cells (OSCs). The chemical structures of the NBG-NFAs contain a D′-D-D′ electron-rich internal core based on a cyclopentadithiophene (or dithienosilole) (D) and alkoxythienyl (D′) core, end-capped with the highly electron-deficient unit 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (A), ultimately providing a A-D′-D-D′-A molecularconfiguration that enhances the intramolecular charge transfer characteristics of the excited states. One can thereby reduce the optical bandgap (E g opt ) to as low as ≈1.10 eV, one of the smallest values for NFAs reported to date. In bulk-he...

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A Wide-Bandgap Donor Polymer for Highly Efficient Non-fullerene Organic Solar Cells with a Small Voltage Loss

Cited by 334 publications

References 38 publications

A High‐Efficiency Organic Solar Cell Enabled by the Strong Intramolecular Electron Push–Pull Effect of the Nonfullerene Acceptor

A High‐Efficiency Organic Solar Cell Enabled by the Strong Intramolecular Electron Push–Pull Effect of the Nonfullerene Acceptor

Polymer Donors for High‐Performance Non‐Fullerene Organic Solar Cells

Bandgap Narrowing in Non‐Fullerene Acceptors: Single Atom Substitution Leads to High Optoelectronic Response Beyond 1000 nm

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