Correlating the electron-donating core structure with morphology and performance of carbon oxygen-bridged ladder-type non-fullerene acceptor based organic solar cells

Li, Wei; Xiao, Zuo; Cai, Jinlong; Smith, Joel A.; Spooner, Emma L. K.; Kilbride, Rachel C.; Game, Onkar; Meng, Xianghe; Li, Donghui; Zhang, Huijun; Chen, Mengxue; Gurney, Robert S.; Liú, Dan; Jones, Richard; Lidzey, David G.; Ding, Liming; Wang, Tao

doi:10.1016/j.nanoen.2019.04.053

Cited by 43 publications

(28 citation statements)

References 55 publications

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“…The current density–voltage ( J – V ) and external quantum efficiency (EQE) curves are shown in Figure and important parameters are summarized in Table . The pristine ZnO‐based device shows a J SC of 16.57 mA cm −2 , an open‐circuit voltage ( V OC ) of 0.935 V, fill factor (FF) of 70.83%, and a PCE of 10.97%, which is in agreement with the reported results . By depositing CMC onto ZnO layer and annealing at 120 °C, a positive effect on the performance of OSCs was observed.…”

Section: Methodssupporting

confidence: 90%

From Straw to Device Interface: Carboxymethyl‐Cellulose‐Based Modified Interlayer for Enhanced Power Conversion Efficiency of Organic Solar Cells

Liu

Islam

et al. 2019

Advanced Science

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The research on organic solar cells (OSCs) has made an immense progress over the last one decade because OSCs possess multiple advantages, such as light-weight, efficient, economical and large-area fabrication. [1][2][3] To date, the power conversion efficiency (PCE) at the laboratory scale has reached up to ≈16% by employing novel interfacial and photoactive materials. [4] Prior to the importance of photoactive layer, interfacial layer also plays a vital role to fabricate high-performance OSC by reducing the energy barrier at the interface and improving charge transfer. [5,6] However, it is usually impossible for the conventional single interlayer materials to satisfy all the requirements. In this regard, it is highly desirable to develop novel interfacial materials with suitable modification for highly efficient OSCs.To develop effective cathode interfacial materials, interface barrier should be minimized with improved electron mobility. Generally, interface barrier originates directly from the mismatch of the energy levels between the active layer and electrodes. Therefore, the key is to design suitable interfacial materials which can significantly reduce the interface barrier between the electrodes and active layer. In the past decades, numerous attempts have been made and significant progresses have been achieved for the cathode interface modification of OSCs. For example, few metallic salts, including LiF, CsF, and Cs 2 CO 3 , [7][8][9] have been integrated into OSCs to modify the interface and the devices exhibited enhanced efficiencies. However, the electron transfer ability of these metallic salts is low and these layers are thickness sensitive (<1 nm), which restrict their application on large scale. In this regard, some organic materials are also introduced for the interface modification of OSCs. Generally, organic materials are synthesized easily with high electron mobility and tunable bandgap energy. Some of them (poly [(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctyfluorene)], polyethylenimine, and polyethylenimine ethoxylated (PEIE)) were found to be effective interface modifiers with matched performance of these devices, compared to the devices using conventional interlayer materials (Ca/Mg). [10,11] However, OSC devices. However, the limited resources, high-cost, and non-ecofriendly nature of petrochemical-based interface materials restrict their commercial applications. Here, a facile and effective approach to prepare cellulose and its derivatives as a cathode interface layer for OSCs with enhanced performance from rice straw of agroforestry residues is demonstrated. By employing this carboxymethyl cellulose sodium (CMC) into OSCs, a highly efficient inverted OSC is constructed, and a power conversion efficiency (PCE) of 12.01% is realized using poly[(2,6-(4,8-bis(5-(2-ethylhexyl)-thiophen-2-yl)-benzo[1,2-b:4,5-b′] dithiophene))-alt-(5,5-(1′,3′-di-2thienyl-5′,7-bis(2-ethylhexyl)benzo[1′,2′-c: 4′,5′-c′]dithiophene-4,8-dione): 3,9-bis(2-methylene -((3-(1, 1-dicyanomethylen...

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Section: Methodssupporting

confidence: 90%

From Straw to Device Interface: Carboxymethyl‐Cellulose‐Based Modified Interlayer for Enhanced Power Conversion Efficiency of Organic Solar Cells

Liu

Islam

et al. 2019

Advanced Science

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“…For example, by carefully tuning the molecular design and film processing conditions, some NFA based OSC systems such as PTB7-Th:CO i 8DFIC have been shown to achieve an optimised blend morphology with desired miscibility, domain size and molecular orientation with balanced aggregation and crystallisation, resulting in simultaneously enhanced OSC efficiency and shelf life stability. 100,101 We and others have recently reported multiple cases of reduced performance degradation of OSCs based on NFAs under thermal stress compared to those based on FAs, presumably due to a lower tendency of NFAs to diffuse, nucleate, aggregate and crystallise within the donor matrix compared to the typically spherical shaped FAs, thereby reducing the formation of detrimental macroscopic aggregates and thus improving their morphological stability. 102 Mechanistic investigations into the morphological degradation of NFA based OSCs due to thermal stress have received relatively little attention to date, although thermally induced morphological degradation has been established as a key consideration for the outdoor applications of OSCs.…”

Section: Morphological Stability Under Thermal Stressmentioning

confidence: 99%

From fullerene acceptors to non-fullerene acceptors: prospects and challenges in the stability of organic solar cells

et al. 2019

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“…These nonfullerene acceptors have strong visible-NIR light-harvesting capability and good electron mobility, delivering higher short-circuit current density (J sc ) and PCE in solar cells than fullerene acceptors. To further enhance light absorption, Xiao et al [13][14][15][16][17][18][19][20][21][22][23][24][25][26] developed stronger light-harvesting A-D-A acceptors by using more electron-rich carbon-oxygenbridged (CO-bridged) core units. The acceptor CO i 8DFIC, based on an octacyclic CO-bridged unit, CO i 8, presents a narrow bandgap of 1.26 eV and strong absorption at 600-1000 nm [15].…”

mentioning

confidence: 99%

18% Efficiency organic solar cells

et al. 2020

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Correlating the electron-donating core structure with morphology and performance of carbon oxygen-bridged ladder-type non-fullerene acceptor based organic solar cells

Abstract: This is a repository copy of Correlating the electron-donating core structure with morphology and performance of carbon-oxygen-bridged ladder-type non-fullerene acceptor based organic solar cells.

Cited by 43 publications

References 55 publications

From Straw to Device Interface: Carboxymethyl‐Cellulose‐Based Modified Interlayer for Enhanced Power Conversion Efficiency of Organic Solar Cells

From Straw to Device Interface: Carboxymethyl‐Cellulose‐Based Modified Interlayer for Enhanced Power Conversion Efficiency of Organic Solar Cells

From fullerene acceptors to non-fullerene acceptors: prospects and challenges in the stability of organic solar cells

18% Efficiency organic solar cells

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