Improved All‐Polymer Solar Cell Performance by Using Matched Polymer Acceptor

Shi, Shaohua; Yuan, Jianyu; Ding, Guanqun; Ford, Michael J.; Lu, Kunyuan; Shi, Guozheng; Sun, Jianxia; Ling, Xufeng; Li, Yong; Ma, Wanli

doi:10.1002/adfm.201601037

Cited by 109 publications

(91 citation statements)

References 48 publications

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“…According to our previous study on BNBP‐based polymer electron acceptors, the optimized E LUMO of polymer electron acceptors should be ≈−3.6 eV . However, for the state‐of‐the‐art polymer electron acceptors based on NDI unit, the E LUMO of are fixed to be ≈−3.85 eV and cannot be effectively tuned . As the result, all‐PSCs of NDI‐based polymer electron acceptors all show low V OC , which limits further enhancement of power conversion efficiency (PCE).…”

Section: Introductionmentioning

confidence: 99%

Polymer Electron Acceptors Based on Iso‐Naphthalene Diimide Unit with High LUMO Levels

Zhang

Han

et al. 2017

Macro Chemistry & Physics

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The lowest unoccupied molecular orbital (LUMO) energy level (ELUMO) is a key parameter for polymer electron acceptors of all‐polymer solar cells (all‐PSCs). The state‐of‐the‐art polymer electron acceptors based on 1,4,5,8‐naphthalenediimide (NDI) unit suffer from low‐lying ELUMO, which leads to low open‐circuit voltage (VOC) of all‐PSCs. In this manuscript, the authors use 1,2,5,6‐naphthalenediimide (iso‐NDI) unit to develop a series of polymer electron acceptors with high‐lying ELUMO. Their thermal, optical, electrochemical, and charge transporting properties are systematically investigated and their applications in all‐PSCs are explored. The polymer based on iso‐NDI unit and bithiophene unit exhibits the ELUMO of −3.50 eV, which is higher than that of the corresponding polymer based on NDI unit (ELUMO = −3.86 eV) by 0.36 eV. As a result, the all‐PSC devices exhibit VOC enhancement by 0.30 V. All‐PSC devices of these polymer electron acceptors with poly(3‐hexylthiophene) as the electron donor show the VOC of 0.90 V and power conversion efficiency of 0.27%. These results indicate that iso‐NDI unit is a promising building block to design polymer electron acceptors for all‐PSCs with high VOC.

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Section: Introductionmentioning

confidence: 99%

Polymer Electron Acceptors Based on Iso‐Naphthalene Diimide Unit with High LUMO Levels

Zhang

Han

et al. 2017

Macro Chemistry & Physics

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“…[100][101][102] The PCEs of more than 12% have been realized for OSCs with small-area devices [34,[102][103][104][105][106][107] and PCEs from 8% to 10% have also been obtained in large-area devices. [102,103,[110][111][112][113][114][115][116][117] But, the preparation of photoactive materials only is not enough to achieve such a remarkable progress. [102,103,[110][111][112][113][114][115][116][117] But, the preparation of photoactive materials only is not enough to achieve such a remarkable progress.…”

Section: Zwitterion Materials For Organic Solar Cellsmentioning

confidence: 99%

Zwitterions for Organic/Perovskite Solar Cells, Light‐Emitting Devices, and Lithium Ion Batteries: Recent Progress and Perspectives

Islam

Pervaiz

et al. 2019

Advanced Energy Materials

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are covalently bonded and their unique characteristics enable them to demonstrate special performance in applications and distinguish them from other conventional organic salts. [12][13][14] Recently, a significant attention has been paid to the use of zwitterions owing to their solubility in polar solvents for solution processing, [15][16][17] and dipole formation for the transfer of carriers [18][19][20] and ions. [21][22][23] Zwitterions have emerged as alternatives to the widely used building blocks such as conventional ionic groups, for developing new functional materials. The presence of both negative and positive ions in the same molecule enables zwitterions to develop interfacial dipole. The ability of zwitterions to develop interfacial dipole provides a new pathway to utilize them as interfacial layer in optoelectronic devices, including organic solar cells (OSCs), perovskite solar cells (PVSCs), and organic light-emitting devices (OLEDs), as well as electrolyte additives for energy devices such as lithium ion batteries (LIBs).It is well known that the ability to transport the charge carriers between the electrodes and organic layers is very crucial to obtain highly efficient electronic devices. [24] A mismatch between the energy levels of organic layers and inorganic electrodes leads to the generation of an energy barrier that hampers the extraction or injection of charge carriers. [25] To get rid of this obstacle, an interlayer between the electrodes and organic layers is applied to facilitate the transfer of charges in organic devices. In OLEDs, interlayers are used to enhance charge injection and reduce the height of Schottky barrier. While in the case of OSCs and PVSCs, apart from the enhancement in charge injection, they also play an important role to increase the built-in electric field across the active layer, ensuring efficient extraction of photogenerated charge carriers. [26][27][28][29][30] Therefore, the design and development of effective interlayer materials for interfacial modification are crucial for high-performance electronic devices. Recently, some significant advances have been demonstrated by applying an interfacial layer between the electrodes and organic layers, resulting in power conversion efficiencies (PCEs) to exceed 14% for single-junction OSCs by choosing appropriate photoactive layer. [31,32] Among different interlayer materials used so far, zwitterionic materials have been proved Zwitterions, a class of materials that contain covalently bonded cations and anions, have been extensively studied in the past decades owing to their special features, such as excellent solubility in polar solvents, for solution processing and dipole formation for the transfer of carriers and ions. Recently, zwitterions have been developed as electrode modifiers for organic solar cells (OSCs), perovskite solar cells (PVSCs), and organic light-emitting devices (OLEDs), as well as electrolyte additives for lithium ion batteries (LIBs).With the rapid advances of zwitterionic materials, high-performan...

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“…However, when mixing 20 with D10 , an enhanced PCE of 6.01 % was achieved (versus 24 ) with a V oc of 0.99 V. Although the high planarity of the main chain facilitated crystallinity and electron transport, it can sacrifice the exciton dissociation owing to the coarse phase separation formed in the blend film. The finer phase separation between 20 and D10 is highly important for the charge separation process, which highlighted that the crystallinity matching between the donor and acceptor polymers is crucial for all‐PSC performance . Substituting the thiophene with furan should be a feasible means to reduce the backbone distortion owing to the small oxygen atomic size in furan (versus sulfur in thiophene).…”

Section: Ndi‐based Polymer Semiconductorsmentioning

confidence: 99%

Imide‐Functionalized Polymer Semiconductors

Sun

Wang

et al. 2018

Chemistry A European J

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Imide‐functionalized π‐conjugated polymer semiconductors have received a great deal of interest owing to their unique physicochemical properties and optoelectronic characteristics, including excellent solubility, highly planar backbones, widely tunable band gaps and energy levels of frontier molecular orbitals, and good film morphology. The organic electronics community has witnessed rapid expansion of the materials library and remarkable improvement in device performance recently. This review summarizes the development of imide‐functionalized polymer semiconductors as well as their device performance in organic thin‐film transistors and polymer solar cells, mainly achieved in the past three years. The materials mainly cover naphthalene diimide, perylene diimide, and bithiophene imide, and other imide‐based polymer semiconductors are also discussed. The perspective offers our insights for developing new imide‐functionalized building blocks and polymer semiconductors with optimized optoelectronic properties. We hope that this review will generate more research interest in the community to realize further improved device performance by developing new imide‐functionalized polymer semiconductors.

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Improved All‐Polymer Solar Cell Performance by Using Matched Polymer Acceptor

Cited by 109 publications

References 48 publications

Polymer Electron Acceptors Based on Iso‐Naphthalene Diimide Unit with High LUMO Levels

Polymer Electron Acceptors Based on Iso‐Naphthalene Diimide Unit with High LUMO Levels

Zwitterions for Organic/Perovskite Solar Cells, Light‐Emitting Devices, and Lithium Ion Batteries: Recent Progress and Perspectives

Imide‐Functionalized Polymer Semiconductors

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