An alcohol-soluble small molecule as efficient cathode interfacial layer materials for polymer solar cells

Chen, Can; Zhang, Chunlin; Peng, Yichun; Wang, Ningning; Liu, Xingpeng; Du, Sanshan; Tong, Junfeng; Li, Jianfeng

doi:10.1016/j.optmat.2021.110909

Cited by 33 publications

(16 citation statements)

References 41 publications

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“…The ITO glass substrate, active layer, and Al were prepared in the same way as in the previous work. [36,37] PFN-ID is dissolved in MeOH and spin-coated onto the photoactive layer at a speed of 3000 rpm for 40 s. During preparation, the concentration of PFN-ID varied as 0.1, 0.25, and 0.5 mg mL À1 . Other testing conditions and characterization were the same as those we reported previously in the literature.…”

Section: Experimental Section 21 Device Fabrication and Characterizationmentioning

confidence: 99%

A New Alcohol‐Soluble Polymer PFN‐ID as Cathode Interlayer to Optimize Performance of Conventional Polymer Solar Cells by Increasing Electron Mobility

et al. 2022

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A new alcohol‐soluble polymer PFN‐ID is successfully synthesized by combining N,N‐di(2‐ethylhexyl)‐6,6′‐dibromoisoindigo and an amino‐containing fluorene subunits, and applied to polymer solar cells (PSCs) with PTB7‐Th:PC71BM as an active layer. The n‐type backbone of the PFN‐ID improves electron transfer performance and thus optimizes device performance. The PSCs with PFN‐ID as cathode interfacial layers (CILs) have significantly improved compared to the device without the interface layer, especially the optimum power conversion efficiency (PCE) of PSCs reaches up to 9.24%, which is 1.62 times higher than that of devices without CILs. The I–V curves show that the introduction of the n‐type backbone leads to a significant increase in the conductivity of PFN‐ID compared to PFN. The UV photoelectron spectroscopy and Mott–Schottky curves further confirm that PFN‐ID can decrease the work function of Al electrode, and increase its built‐in potential, giving higher open‐circuit voltage. The resulting conventional PSCs using PFN‐ID as cathode interlayer achieve high photovoltaic performance, and the research results can provide a new strategy for the advancement of PSCs.

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Section: Experimental Section 21 Device Fabrication and Characterizationmentioning

confidence: 99%

A New Alcohol‐Soluble Polymer PFN‐ID as Cathode Interlayer to Optimize Performance of Conventional Polymer Solar Cells by Increasing Electron Mobility

et al. 2022

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“…Furthermore, the hole mobility (μ h ) and the electron mobility (μ e ) of sprayed films were measured according to the space-charge-limited current method (SCLC). − The hole-only and electron-only device structures are ITO/PEDOT:PSS/Active Layer/MoO 3 /Ag and ITO/ZnO/Active Layer/PFN/Al, respectively. The related J – V curves of electron-only and hole-only devices prepared with three different spraying techniques are shown in Figure S13, and the parameters are shown in Tables S11 and 12.…”

Section: Results and Discussionmentioning

confidence: 99%

Solvent-Vapor-Annealing-Induced Interfacial Self-Assembly for Simplified One-Step Spraying Organic Solar Cells

Zhao

Wang

et al. 2021

ACS Appl. Energy Mater.

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An effective self-assembly vertical alignment of interfacial molecules from an active solution plays an important role in controlling the ultrathin thickness of an interfacial layer and reducing the manufacturing costs of organic solar cells (OSCs). Until now, however, due to the complex multistage film-forming process, this facile one-step coating approach does not work for spray-coated OSCs, while other coating techniques such as spin coating, blade coating, or slot-die coating do. In this work, we found that the simplified one-step spraying OSCs can be successfully implemented with the aid of solvent vapor annealing (SVA) for both fullerene- and nonfullerene-based systems, making the one-step spray-coating technique attractive for future manufacturing of photovoltaic modules. The sprayed self-assembly interfacial molecule can be spontaneously delaminated from ternary organic mixtures and vertically deposited underneath the photoactive layer, boosting high charge separation and transport capability comparable to the conventional two-step spraying OSCs. Furthermore, the SVA-assisted one-step spraying process was comprehensively investigated by a series of characterization techniques combining in situ solvent dynamic drying process and X-ray photoelectron spectroscopy, making the causal relationship between spraying process control and device performance more clear. This work shows that the introduction of SVA into one-step spraying can not only maintain high photovoltaic performance but also advance the large-scale OSC industry.

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“…Generally, a classical bulkheterojunction (BHJ) PSC device is based on the active layer blended with the electron donor and electron acceptor materials [10][11][12]. The power conversion efficiency (PCE) of the PSCs has been further improved by many new organic semiconductors that have been well-designed and synthesized during the past decades [13][14][15][16][17][18]. For electron donor materials, the representative donor-acceptor (D-A) polymers, such as PM6 [19], PBDT-C [15], and D18 [20], have shown excellent performance.…”

Section: Introductionmentioning

confidence: 99%

Rational Design and Characterization of Symmetry-Breaking Organic Semiconductors in Polymer Solar Cells: A Theory Insight of the Asymmetric Advantage

Liang

Yan

et al. 2021

Materials

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Asymmetric molecule strategy is considered an effective method to achieve high power conversion efficiency (PCE) of polymer solar cells (PSCs). In this paper, nine oligomers are designed by combining three new electron-deficient units (unitA)—n1, n2, and n3—and three electron-donating units (unitD)—D, E, and F—with their π-conjugation area extended. The relationships between symmetric/asymmetric molecule structure and the performance of the oligomers are investigated using the density functional theory (DFT) and time-dependent density functional theory (TD–DFT) calculations. The results indicate that asymmetry molecule PEn2 has the minimum dihedral angle in the angle between two planes of unitD and unitA among all the molecules, which exhibited the advantages of asymmetric structures in molecular stacking. The relationship of the values of ionization potentials (IP) and electron affinities (EA) along with the unitD/unitA π-extend are revealed. The calculated reorganization energy results also demonstrate that the asymmetric molecules PDn2 and PEn2 could better charge the extraction of the PSCs than other molecules for their lower reorganization energy of 0.180 eV and 0.181 eV, respectively.

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An alcohol-soluble small molecule as efficient cathode interfacial layer materials for polymer solar cells

Cited by 33 publications

References 41 publications

A New Alcohol‐Soluble Polymer PFN‐ID as Cathode Interlayer to Optimize Performance of Conventional Polymer Solar Cells by Increasing Electron Mobility

A New Alcohol‐Soluble Polymer PFN‐ID as Cathode Interlayer to Optimize Performance of Conventional Polymer Solar Cells by Increasing Electron Mobility

Solvent-Vapor-Annealing-Induced Interfacial Self-Assembly for Simplified One-Step Spraying Organic Solar Cells

Rational Design and Characterization of Symmetry-Breaking Organic Semiconductors in Polymer Solar Cells: A Theory Insight of the Asymmetric Advantage

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