Enhance the efficiency of polymer solar cells through regulating phase segregation and improving charge transport via non-toxic halogen-free additive

Fu, Zhijie; Liu, Xingpeng; Wang, Yufei; Du, Sanshan; Tong, Junfeng; Li, Jianfeng; Zhang, Rongling; Yang, Chunming

doi:10.1016/j.solener.2021.03.012

Cited by 27 publications

(14 citation statements)

References 51 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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“…In order to evaluate the impact of the green additive EHB and processing solvent O‐XY on the morphology of the thin films, we characterized the information on the surface and inside of the films using AFM [ 29–36 ] and TEM, and they were exhibited in Figure . As seen in Figure 3a,b, the root mean square value (RMS) of the devices treated with 3% EHB is 0.88 nm, which is smaller than the without additives device (1.58 nm), the smaller RMS, the lower roughness of the blend film, probably due to the 3% EHB additives making the surface of the blend film more uniform, which contributes to the establishment of a good interpenetrating network structure, promoting dissociation of excitons, and providing a pass‐through path for charge transport.…”

Section: Resultsmentioning

confidence: 99%

Enhancement Efficiency of Organic Photovoltaic Cells via Green Solvents and Nontoxic Halogen‐Free Additives

Liu

Niu

et al. 2021

Advanced Sustainable Systems

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For organic photovoltaic cells, the development of new green solvents and nontoxic and halogen‐free additives is an urgent issue. Here, a simple combination of o‐xylene (O‐XY) and ethyl 2‐hydroxybenzoate (EHB) is introduced in inverted devices based on poly[4,8‐bis(5‐(2‐ethylhexyl)‐thiophene‐2‐yl) benzo[1,2‐b;4,5‐b′] dithiophene‐2,6‐diyl‐alt‐(4‐(2‐ethylhexyl)‐3‐fluorothieno[3,4‐b] thiophene)‐2‐carboxylate‐2‐6‐diyl]:[6,6]‐phenyl‐C71‐butyric acid methyl ester (PTB7‐Th:PC71BM) as blend layers, the device performance reaches optimal values (9.29%) when O‐XY and 3% EHB are introduced as additives, accompanied by the maximum fill factor (67.5%) and JSC (17.20 mA cm−2). From the results of characterization analysis, it is clear that EHB additive improves the crystallinity of the donor by regulating the kinetic process of active layer formation, selectively solubilizes the more aggregated fullerene acceptors, which allows PTB7‐Th to enter the conformational domain of PC71BM, and accelerates the molecular rearrangement. Besides, the EHB additive not only reduces the recombination, increases the carrier migration rate but also promotes the crystallinity of the donor, resulting in a tighter stacking. This work provides a green combination of solvents and additives that is important for the mass production of solar cells.

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“…The general methods used to control the morphology of the photoactive layer include solvent selection, thermal annealing (TA), solvent vapor annealing (SVA), pre-aggregation, additives, etc. 33–38 The key effect on the above mentioned strategy for morphology control lies in tuning the dynamics or kinetics of the donor:acceptor (D:A) phase separation during the solidification process or post-ripening. In particular, the additives are most frequently used and are proved to be critical ingredients for most high-performance OSCs.…”

Section: Introductionmentioning

confidence: 99%

Improving the device performance of organic solar cells with immiscible solid additives

Chen

et al. 2022

J. Mater. Chem. C

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Enhance the efficiency of polymer solar cells through regulating phase segregation and improving charge transport via non-toxic halogen-free additive

Cited by 27 publications

References 51 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

Enhancement Efficiency of Organic Photovoltaic Cells via Green Solvents and Nontoxic Halogen‐Free Additives

Improving the device performance of organic solar cells with immiscible solid additives

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