Light-activated gas sensors

Li, Qiutong; Wang, Xiao Xue; Li, Huayao; Guo, Xin

doi:10.1360/tb-2021-1075

Cited by 7 publications

(5 citation statements)

References 55 publications

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“…Organic solar cells (OSCs) have attracted much attention in the past few years due to their various advantages, such as low‐cost, lightweight, and mechanically flexible properties. [ 1–6 ] The power conversion efficiency (PCE) of OSCs has improved dramatically due to the development of new photoactive materials [ 7–11 ] and the innovation of interface engineering. [ 12–15 ] The PCEs of small‐area single junction OSCs have reached over 19%, providing an essential foundation for scaling up.…”

Section: Introductionmentioning

confidence: 99%

“…Organic solar cells (OSCs) have attracted much attention in the past few years due to their various advantages, such as low-cost, lightweight, and mechanically flexible properties. [1][2][3][4][5][6] The power conversion efficiency (PCE) of OSCs has improved dramatically due to the development of new photoactive materials [7][8][9][10][11] and the However, the crystallinity of Qx-1 and Qx-2 are significantly different, providing the ideal materials for investigating the abovementioned question.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Absorption Characterization Guided Slot‐Die‐Coated High‐Performance Large‐Area Flexible Organic Solar Cells and Modules

Shen

Zhang

et al. 2023

Advanced Materials

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The PCEs of small-area single junction OSCs have reached over 19%, providing an essential foundation for scaling up. [16][17][18] However, these devices with an effective area smaller than 0.1 cm 2 are usually fabricated by the spin-coating method on glassindium tin oxide (ITO) substrates, which limits the further upscale continuous production due to the associated uneven linear speed. Large-area coating methods, such as spray coating, [16] blade coating, [17][18][19] slot-die coating, [20][21][22] inkjet printing, [23] etc., are widely used in the scalable fabrication of large-area OSCs. Due to its advantages of easy operation, low material waste, and high throughput, the slot-die coating process is considered one of the most promising approaches in the field of largearea OSCs and has the potential for further roll-to-roll (R2R) production. [24][25][26][27][28] Recently, many studies revealed that the solvent drying process in the slot-die coating is much slower than that in spin coating, leading to a significant change in the nanoscale morphology of the photoactive layers. [29] Various efforts have been devoted to optimizing the slot-die coating methodology for fabricating high-efficiency OSCs. Early in 2014, Zhan et al. focused on the drying mechanism in the spin-coating and roll-coated methods by comparing the amount of additive, demonstrating the importance of the individual optimization approach in the large-area coating process. [30] By synergistic optimization of slot-die coating conditions, our group successfully acquired high-efficiency flexible devices, which maintain over 98% PCE of the small-area rigid devices. [31] Besides the coating condition optimization, tremendous efforts have been made to investigate the aggregation during the coating process. Ma et al. revealed that processing conditions could affect the phase-separation kinetics of donors and acceptors in the active layer, such as coating temperature and solution temperature. [32,33] Molecular aggregation ability significantly influences film formation kinetics of the active layer, while its influence on slot-die coating fabrication has seldom been investigated. Recently, we developed two acceptors with low reorganization energy, i.e., Qx-1 and Qx-2, and the spin-coated small-area devices of PM6:Qx-1 and PM6:Qx-2 fabricated using chloroform showed similar device performance (≈18%) due to their similar molecular structure. [34] Slot-die coating is recognized as the most compatible method for the roll-toroll (R2R) processing of large-area flexible organic solar cells (OSCs). However, the photovoltaic performance of large-area flexible OSC lags significantly behind that of traditional spin-coating devices. In this work, two acceptors, Qx-1 and Qx-2, show quite different film-formation kinetics in the slot-die coating process. In situ absorption spectroscopy indicates that the excessive crystallinity of Qx-2 provides early phase separation and early aggregation, resulting in oversized crystal domains. Consequently, the PM6:Qx-1-based 1 cm 2 flex...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ Absorption Characterization Guided Slot‐Die‐Coated High‐Performance Large‐Area Flexible Organic Solar Cells and Modules

Shen

Zhang

et al. 2023

Advanced Materials

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“…Developing a bi‐continuously morphological network for efficient exciton dissociation and charge transport is a key for BHJ devices to obtain high performance. Nevertheless, the large‐scale unmixing phase separation in the BHJ blend film and the molecular misalignment orientation at the donor/acceptor interface are detrimental to exciton dissociation [8] . Even worse, the quasi‐equilibrium morphology of the photoactive mixture is usually unstable after a long period of light or thermal aging.…”

Section: Introductionmentioning

confidence: 99%

Regulating the Sequence Structure of Conjugated Block Copolymers Enables Large‐Area Single‐Component Organic Solar Cells with High Efficiency and Stability

et al. 2023

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Single‐component organic solar cells (SCOSCs) based on conjugated block copolymers (CBCs) by covalently bonding polymer donor and polymer acceptor become more and more appealing, due to the formation of favorable and stable morphology. Unfortunately, deeply understanding the effect of the assembly behavior caused by sequence structure of CBCs on the device performance is still ambiguous. Herein, from the aspect of manipulating the sequence length and distribution regularity of CBCs, we synthesized a series of new CBCs, namely D18(20)‐b‐PYIT, D18(40)‐b‐PYIT and D18(60)‐b‐PYIT by two‐pot polymerization, and D18(40)‐b‐PYIT(r) by traditional one‐pot method. It is observed that precise manipulation of sequence length and distribution regularity of the polymer blocks fine‐tunes the self‐assembly of the CBCs, optimizes film morphology, improves optoelectronic properties and reduces energy loss, leading to simultaneously improved efficiency and stability. Among these CBCs, the D18(40)‐b‐PYIT‐based device achieves a champion efficiency of 13.4% with enhanced stability, which is the outstanding performance of SCOSCs. Importantly, the regular sequence distribution and suitable sequence length of the CBCs enable a facile film‐forming process of the printed device. For the first time, the blade‐coated large‐area rigid/flexible SCOSCs are fabricated, delivering an impressive efficiency of 11.62%/10.73%, much higher than their corresponding binary devices.

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“…A refined double‐fibril network morphology is highly important for achieving efficient charge carrier transport, and thus high fill factor in organic solar cells. [ 24,25 ] Generally speaking, to achieve double‐fibril network morphology, the solubilities of polymer donor and small molecular acceptor are critical. Polymer donors are purposefully designed with a planar molecular backbone, enabling strong intermolecular interactions and the growth of high‐quality crystalline donor phase in the active layer; [ 26–31 ] whereas, the small molecular acceptors are designed with not only a planar molecular backbone but also bulky side chains to endue them with good solubility in the processing solvent.…”

Section: Introductionmentioning

confidence: 99%

Green‐Solvent‐Processed High‐Performance Ternary Organic Solar Cells Comprising a Highly Soluble and Fluorescent Third Component

Lü

Ran

Liu

et al. 2023

Adv Funct Materials

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Nowadays, it is still a great challenge to obtain high‐performance green‐solvent‐processed organic solar cells (OSCs). In this study, a ternary blend strategy (one donor and two acceptors, 1D/2A) is developed to solve the difficulty of film morphology modulation during the fabrication of high‐performance green‐solvent‐processed OSCs. A typical high‐performance halogenated‐solvent processable binary system D18:BTP‐eC9‐4F is selected as the host, its green‐solvents‐processed devices show an inferior power conversion efficiency (PCE) of ≈16%. SM16 with two 3D shape persistent end groups is selected as the third component due to its high fluorescence quantum yield, reduced intermolecular interaction, good solubility, and moderate crystallinity. As a result, the ternary devices display bicontinuous interpenetrating networks, reduced energy loss, and suppressed charge carrier recombination losses. Hence, an excellent PCE of 18.20% is achieved for the D18:BTP‐eC9‐4F:SM16 ternary devices, which is much higher than D18:BTP‐eC9‐4F‐based binary ones and also one of the highest PCEs for the green‐solvents‐processed OSCs. Besides, this strategy also demonstrates a good universality for other binary systems and becomes an effective pathway for the development of green‐solvent processable high‐performance OSCs.

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Light-activated gas sensors

Cited by 7 publications

References 55 publications

In Situ Absorption Characterization Guided Slot‐Die‐Coated High‐Performance Large‐Area Flexible Organic Solar Cells and Modules

In Situ Absorption Characterization Guided Slot‐Die‐Coated High‐Performance Large‐Area Flexible Organic Solar Cells and Modules

Regulating the Sequence Structure of Conjugated Block Copolymers Enables Large‐Area Single‐Component Organic Solar Cells with High Efficiency and Stability

Green‐Solvent‐Processed High‐Performance Ternary Organic Solar Cells Comprising a Highly Soluble and Fluorescent Third Component

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