Rational Anode Engineering Enables Progresses for Different Types of Organic Solar Cells

Ma, Ruijie; Zhang, Miao; Li, Yixin; Liu, Tao; Luo, Zhenghui; Xu, Ye; Li, Ping; Zheng, Nan; Li, Jianfeng; Li, Yuan; Chen, Runfeng; Hou, Jianhui; Huang, Fei; Yan, He

doi:10.1002/aenm.202100492

Cited by 113 publications

(81 citation statements)

References 60 publications

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“…[68] In another work, they investigated the doping effect of phenylethylamine hydrochloride (PA • HCl), tyramine (TA) and DA • HCl, PEDOT:PSS, respectively. [69] The resulting PEDOT:PSS-PA, PEDOT:PSS-TA, and PEDOT:PSS-DA showed different performance variation trends in different BHJ systems. Indepth studies showed the increasing numbers of hydroxyls could form more hydrogen bonds, leading to greater WF and electronic conductivity, but the hydrophilicity smoothened the HTL surface.…”

Section: Organic Hole Transporting Materialsmentioning

confidence: 93%

Hole/Electron Transporting Materials for Nonfullerene Organic Solar Cells

Peng

2022

Chemistry A European J

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Nonfullerene acceptor based organic solar cells (NF‐OSCs) have witnessed rapid progress over the past few years owing to the intensive research efforts on novel electron donor and nonfullerene acceptor (NFA) materials, interfacial engineering, and device processing techniques. Interfacial layers including electron transporting layers (ETL) and hole transporting layers (HTLs) are crucially important in the OSCs for facilitating electron and hole extraction from the photoactive blend to the respective electrodes. In this review, the lates progress in both ETLs and HTLs for the currently prevailing NF‐OSCs are discussed, in which the ETLs are summarized from the categories of metal oxides, metal chelates, non‐conjugated electrolytes and conjugated electrolytes, and the HTLs are summarized from the categories of inorganic and organic materials. In addition, some bifunctional interlayer materials served as both ETLs and HTLs are also introduced. Finally, the prospects of ETL/HTL materials for NF‐OSCs are provided.

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Section: Organic Hole Transporting Materialsmentioning

confidence: 93%

Hole/Electron Transporting Materials for Nonfullerene Organic Solar Cells

Peng

2022

Chemistry A European J

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“…Moreover, by using dopamine as dopant, Huang et al improved the performance of commercial PEDOT:PSS as HTL in OSCs. [31,32] In recent years, the in situ electrochemical polymerization was also considered a powerful approach to synthesize neutral PEDOT. The PEDOT film could be directly deposited on the electrode without being processed through solution method, and thus the necessity of introducing an acid template compound for water-solubility can be avoided.…”

Section: Introductionmentioning

confidence: 99%

A New PEDOT Derivative for Efficient Organic Solar Cell with a Fill Factor of 0.80

Kang

Liao

Yang

et al. 2022

Advanced Energy Materials

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organic solar cells (OSCs), and organic thin-film transistors (OTFTs), with multiple favorable characteristics such as high conductivity, good transparency, and easy processing. [1][2][3][4][5][6][7][8][9][10] In particular, PEDOT:PSS has been dominantly used as hole transporting layer material (HTM) in OSCs, and the highest power conversion efficiencies (PCEs) are mostly obtained by utilizing the PEDOT:PSS HTL. [11][12][13][14][15][16][17][18][19] However, PEDOT:PSS contains the acidic content PSS, which is the main factor to degrade the long-term operational stability of OSCs. Many research results have proved that the strong acidity of PSS can decompose the underneath electrode, leading to the permeation of dissociative metal elements into the active layer, which severely damages OSC performances. [20][21][22][23] Unfortunately, it is inevitable to introduce massive acid because the acidic PSS has to be used as template compound in the synthesis of PEDOT:PSS to obtain water solubility for processing. Moreover, the doping process with strong acid is indispensable for PEDOT:PSS to obtain high work function (WF) and good conductivity. In addition to the acidic nature, PEDOT:PSS is a multiphase composite and has to be prepared in water suspension, making it instable for storage and transport. [25][26][27] Thus, it is strongly desired to develop non-corrosive and stable PEDOT without sacrificing the hole collection ability.To mitigate the corrosive effect, the chemical modification was used to reduce the acidity of PEDOT:PSS. For instance, Shao et al. demonstrated that the acidity of PEDOT:PSS could be diluted by introducing the pH-neutral MoO 3 to improve OSC stability under ambient conditions. [28] Moreover, the treatment by Lewis bases such as NaOH and 2,3-dihydroxypyridine was also employed to reduce the acidity of PEDOT:PSS, by which the device stabilities were improved. Furthermore, pH neutral m-PEDOT:PSS was developed to construct interconnecting layers in tandem OSCs. The neutral pH of m-PEDOT:PSS could avoid the corrosive effect on the underneath electron transporting layer, improving the performance of tandem OSCs. However, the reduced acidity will concomitantly cause a serious attenuation of doping effect, or even de-doping, for the PEDOT:PSS, which decreases both the WF and the conductivity of the HTLs, leading to an inferior PCE as compared to the device with acid PEDOT:PSS.Besides chemical modification, great effort has been devoted to the chemical synthesis of PEDOT with weak acidity. For Although PEDOT:PSS is the most prominently used conducting polymer as hole transporting layer (HTL) material in organic solar cells (OSCs), the strong acidity of PEDOT:PSS has been proved to cause corrosion on electrodes, which is largely responsible for device instability. At present, the development of a non-corrosive and stable PEDOT with comparable performance to PEDOT:PSS remains a great challenge in the field. Herein, a solid n-PEDOT:POM powder with neutral pH is synthesized by utilizing polyoxometalate (POM) ...

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“…To inject or collect electrons from the lowest unoccupied molecular orbitals (LUMO) of acceptor, materials such as low work function metals, metal oxides, organic small molecules, and polyelectrolytes were used as cathode interlayer. [ 27 , 28 , 29 ] Though modifications of PEDOT:PSS were reported to tune the work function and surface energy of the substrate, [ 30 , 31 , 32 , 33 , 34 ] more attentions were attracted to develop the cathode interlayer materials and engineering.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Cathode Interlayer Enables 17.4% Efficiency Binary Organic Solar Cells

Song

et al. 2022

Advanced Science

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With the emergence of fused ring electron acceptors, the power conversion efficiency of organic solar cells reached 19%. In comparison with the electron donor and acceptor materials progress, the development of cathode interlayers lags. As a result, charge extraction barriers, interfacial trap states, and significant transport resistance may be induced due to the unfavorable cathode interlayer, limiting the device performances. Herein, a hybrid cathode interlayer composed of PNDIT‐F3N and PDIN is adopted to investigate the interaction between the photoexcited acceptor and cathode interlayer. The state of art acceptor Y6 is chosen and blended with PM6 as the active layer. The device with hybrid interlayer, PNDIT‐F3N:PDIN (0.6:0.4, in wt%), attains a power conversion efficiency of 17.4%, outperforming devices with other cathode interlayer such as NDI‐M, PDINO, and Phen‐DPO. It is resulted from enhanced exciton dissociation, reduced trap‐assisted recombination, and smaller transfer resistance. Therefore, the hybrid interlayer strategy is demonstrated as an efficient approach to improve device performance, shedding light on the selection and engineering of cathode interlayers for pairing the increasing number of fused ring electron acceptors.

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Rational Anode Engineering Enables Progresses for Different Types of Organic Solar Cells

Abstract: Research data are not shared.

Cited by 113 publications

References 60 publications

Hole/Electron Transporting Materials for Nonfullerene Organic Solar Cells

Hole/Electron Transporting Materials for Nonfullerene Organic Solar Cells

A New PEDOT Derivative for Efficient Organic Solar Cell with a Fill Factor of 0.80

Hybrid Cathode Interlayer Enables 17.4% Efficiency Binary Organic Solar Cells

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