N-type small molecule as an interfacial modification layer for efficient inverted polymer solar cells

Fan, Ping; Zheng, Yifan; Song, Jiasheng; Yu, Junsheng

doi:10.1016/j.solener.2017.09.060

Cited by 19 publications

(7 citation statements)

References 40 publications

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“…This phenomenon indicates that the high crystalline polymer of PffBT4T‐2OD: PCBM processed on ZnO NPs can induce the large aggregation domain with relative uniform surface, exhibiting more ordered structure. This will be beneficial to charge transport and collection, leading to the improvement of J SC and FF simultaneously . Therefore, the formation of an improved uniform surface resulted from CME would be favorable for higher efficiency PSCs.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Crystallinity Modulation between Electron Transport Layer and Photo‐Generation Materials on ZnO‐Based Polymer Solar Cells

et al. 2018

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As one of the most widely used electron transport layers (ETLs) for inverted polymer solar cells (PSCs), ZnO has great effect on the growth of photo‐generated layer. In this work, the ZnO‐based PSCs with the compositional blend of PffBT4T‐2OD: PCBM and PTB7‐Th: PCBM are fabricated to investigate the crystallinity modulation effect (CME) between electron transport layer and photo‐generation materials. The results showed that both the high crystallinity PffBT4T‐2OD: PCBM processed on the large nanoparticles ZnO and the low crystallinity PTB7‐Th: PCBM processed on small nanoparticles ZnO exhibit excellent photovoltaic performances. By verifying the combination of ZnO nanoparticles with photo‐generation materials, it proves that the CME can result in a smooth photo‐generated layer surface to ensure efficient electron transport as well as collection with suppressed bimolecular recombination, leading to the increase of photocurrent and the improvement of inverted PSCs performance accordingly.

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Section: Resultsmentioning

confidence: 99%

“…This will be beneficial to charge transport and collection, leading to the improvement of J SC and FF simultaneously. [31] Therefore, the formation of an improved uniform surface resulted from CME would be favorable for higher efficiency PSCs.…”

Section: Resultsmentioning

confidence: 99%

Effect of Crystallinity Modulation between Electron Transport Layer and Photo‐Generation Materials on ZnO‐Based Polymer Solar Cells

et al. 2018

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“…For devices with the PFBr layer prepared by the solution with 2 mg mL −1 , we observe that R 1 decreases to 2232 Ω, revealing that the properties of charge transfer have been improved by inserting PFBr. The results of impedance curves clearly show that a good ohmic contact is correlated to charge carrier transport and high electron mobility can be achieved between ITO and active layer by introducing an interfacial modification layer of PFBr . These results supply a rational explanation for the enhancement in J SC and FF for the corresponding devices.…”

Section: Resultsmentioning

confidence: 63%

“…In particular, bulk heterojunction polymer solar cells (PSCs) have attracted great attention during recent decades, owing to the excellent merits of lightweight, flexible low‐cost, and large‐area devices through solution processing . Recent great progresses have been made by controlling the active layer morphology by posttreatment methods, developing novel interfacial layers, active materials, and new device structures with enlarged donor/acceptor interface . As known, there are 2 main device structures of PSCs.…”

Section: Introductionmentioning

confidence: 99%

An eco‐friendly water‐soluble fluorene‐based polyelectrolyte as interfacial layer for efficient inverted polymer solar cells

Peng

et al. 2018

Polymers for Advanced Techs

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A conjugated polyelectrolyte poly (9,9-bis(3′-[(N,N-dimethyl)-N-ethylammonium]-propyl)-2,7-fluorene dibromide) (PFBr) with the feature of environmental friendliness and cheapness was successfully used in polymer solar cells (PSCs) as the cathode interfacial layer (CIL). And we successfully demonstrate that the PFBr can build interfacial dipoles at the CIL/cathode interfaces, leading to reduce cathode work functions and improve open-circuit voltages, which decrease interfacial energy loss at the cathode. It not only improves the electron transfer efficiency but also inhibits the charge carrier recombination at the contact interface. Impedance spectra revealed that the optimal device with the smallest charge transport time constant of 2.83 microseconds was achieved under the concentration of 2 mg mL −1 of PFBr, which suggests efficient electron transport on the interface between the organic active layer and the indium tin oxide cathode. Moreover, as a consequence, the power conversion efficiency of the PSCs increases to 3.83% (with PFBr as CIL) from 1.89% (without any CIL), based on the poly(3-hexylthiophene) and [6,6]-phenyl C 61 -butyric acid methyl ester bulk heterojunction active layer. Therefore, our observation can demonstrate PFBr is a prospective candidate as CIL for constructing low-cost, largearea, and flexible PSCs. KEYWORDS cathode interfacial layer, electrochemical impedance spectroscopy, PFBr, polymer solar cells, scanning Kelvin probe microscope 1 | INTRODUCTION Photovoltaic technology provides an environmentally friendly and sustainable power supply for overcoming the global energy crisis. 1,2 In particular, bulk heterojunction polymer solar cells (PSCs) have attracted great attention during recent decades, owing to the excellent merits of lightweight, flexible low-cost, and large-area devices through solution processing. 3-5 Recent great progresses have been made by controlling the active layer morphology by posttreatment methods, 6 developing novel interfacial layers, 7 active materials, and new device structures with enlarged donor/acceptor interface. 8 As known, there are 2 main device structures of PSCs. The commonly adopted device structure of regular PSCs consists of indium tin oxide (ITO)/PEDOT:PSS (hole transport layer)/active layer/electron transport layer/low-work-function metal cathode (such as Ca and Al). It has been proved that the lifetime for regular PSCs is poor, because of the reactive metal cathode with a low-work function, which can be easily oxidized in air, and the hole-collecting interlayer of acidic and hygroscopic PEDOT:PSS etching of the ITO. As an alternative, there has been an increased interest in inverted PSCs (i-PSCs), in which the charge-collecting nature of the electrodes is reversed; that is, modified ITO is used as the cathode, and a high-work-function metal (such as Ag) is used as the anode. The i-PSCs have attracted more and more research because it provides not only long-term stability but also flexibility in the design and fabrication for advanced PSCs.For achi...

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“…12–18 ETL is a cathode interface layer and should not only form a good ohmic contact with the active layer to facilitate the collection of charges but should also have proper energy levels for efficient exciton separation and charge transport. 19–24…”

Section: Introductionmentioning

confidence: 99%

Automatic formation of electron transport layer in BHJ solar cells using phenothiazine-based conjugated small molecular electrolytes

et al. 2022

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N-type small molecule as an interfacial modification layer for efficient inverted polymer solar cells

Cited by 19 publications

References 40 publications

Effect of Crystallinity Modulation between Electron Transport Layer and Photo‐Generation Materials on ZnO‐Based Polymer Solar Cells

Effect of Crystallinity Modulation between Electron Transport Layer and Photo‐Generation Materials on ZnO‐Based Polymer Solar Cells

An eco‐friendly water‐soluble fluorene‐based polyelectrolyte as interfacial layer for efficient inverted polymer solar cells

Automatic formation of electron transport layer in BHJ solar cells using phenothiazine-based conjugated small molecular electrolytes

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