Ultrathin Anode Buffer Layer for Enhancing Performance of Polymer Solar Cells

Wang, Dun; Wang, Jian; Li, Lingliang; An, Qiaoshi; Huang, Hui; Jiao, Chaoqun; Liu, Yang; Zhang, Fujun

doi:10.1155/2014/846581

Cited by 8 publications

(2 citation statements)

References 23 publications

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“…4083) stock contains large proportions of insulating PSS (PEDOT:PSS ratio of 1:6), which compromises the electrical conductivity of the PEDOT:PSS. Besides that, the acidic nature of PEDOT:PSS (pH between 1 and 2) corrodes the interface between the ITO and the PEDOT:PSS and causes the diffusion of Indium into the photoactive layer, to result in degradation of the device11. Thus, several approaches have been employed to modify the properties of PEDOT:PSS, including the incorporation of dopants/additives (e.g., ethylene glycol12, dimethyl sulfoxide13, ionic liquids14, or nanoparticles15), and the post-treatment of the PEDOT:PSS film with suitable materials (e.g., hexafluoroacetone16, surfactant17, salts18, and acids19).…”

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confidence: 99%

Functional solid additive modified PEDOT:PSS as an anode buffer layer for enhanced photovoltaic performance and stability in polymer solar cells

Saianand

Gopalan

et al. 2017

Sci Rep

113

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Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is most commonly used as an anode buffer layer in bulk-heterojunction (BHJ) polymer solar cells (PSCs). However, its hygroscopic and acidic nature contributes to the insufficient electrical conductivity, air stability and restricted photovoltaic (PV) performance for the fabricated PSCs. In this study, a new multifunctional additive, 2,3-dihydroxypyridine (DOH), has been used in the PEDOT: PSS buffer layer to obtain modified properties for PEDOT: PSS@DOH and achieve high PV performances. The electrical conductivity of PEDOT:PSS@DOH films was markedly improved compared with that of PEDOT:PSS. The PEDOT:PSS@DOH film exhibited excellent optical characteristics, appropriate work function alignment, and good surface properties in BHJ-PSCs. When a poly(3-hexylthiohpene):[6,6]-phenyl C61-butyric acid methyl ester blend system was applied as the photoactive layer, the power conversion efficiency of the resulting PSCs with PEDOT:PSS@DOH(1.0%) reached 3.49%, outperforming pristine PEDOT:PSS, exhibiting a power conversion enhancement of 20%. The device fabricated using PEDOT:PSS@DOH (1.0 wt%) also exhibited improved thermal and air stability. Our results also confirm that DOH, a basic pyridine derivative, facilitates adequate hydrogen bonding interactions with the sulfonic acid groups of PSS, induces the conformational transformation of PEDOT chains and contributes to the phase separation between PEDOT and PSS chains.

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mentioning

confidence: 99%

Functional solid additive modified PEDOT:PSS as an anode buffer layer for enhanced photovoltaic performance and stability in polymer solar cells

Saianand

Gopalan

et al. 2017

Sci Rep

113

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“…The respective functional stack consists of glass/ITO/PEDOT:PSS/donor/acceptor BHJ/LiF/Al, − which relies on PEDOT:PSS and LiF as the key interfacial layers on either side of the BHJ. PEDOT:PSS has many known advantages, including high conductivity, transparency, water processability, large-scale processability, and smoothing out the roughness of the underlying ITO. − Because PEDOT:PSS is typically in direct contact with the BHJ, efforts have been directed toward the development of PEDOT:PSS modifiers that tailor its surface chemistry. − …”

Section: Introductionmentioning

confidence: 99%

How to Choose an Interfacial Modifier for Organic Photovoltaics Using Simple Surface Energy Considerations

Yang

Cao

Müller‐Buschbaum

2021

ACS Appl. Mater. Interfaces

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Organic photovoltaics are typically composed of at least four different materials, including the donor and acceptor components of the bulk heterojunction, the interfacial layers at each electrode, the electrodes themselves, and solution additives that may persist in the final sandwich structure. The interplay of surface energies between these different layers is profoundly complex, as the deposition and annealing of one layer on top of another may be influenced by the surface energy of these interfaces. While the energy levels of one layer with respect to adjacent layers are important to facilitate charge separation and collection at the electrodes, the relative surface energies of the interfaces in contact with the multicomponent bulk heterojunction can be beneficial or disadvantageous, or be neutral, with respect to the performance of the OPV device. Because the bulk heterojunction is a mixture of donor and acceptor polymers and/or small molecules, the accumulation of one of the components on the underlying electrode interface can be driven by surface energy considerations. A donor-or acceptor-rich interface may affect charge carrier flow to the electrode, thus affecting the overall efficiency. Here, ITO/PEDOT:PSS electrodes in forward organic photovoltaic devices are treated with five different thin interfacial layers to change the relative surface energy of this electrode with respect to the adjacent bulk heterojunction. Contact angle measurements with four probe liquids enable calculation of the surface energies, and the results are compared with the performance of forward-biased organic photovoltaic devices. Time-of-flight secondary ion mass spectrometry results substantiate the predictions of gradients in the bulk heterojunction layers, and grazing-incidence wide-angle X-ray scattering measurements show the impact on the polymer crystallites. Thus, a simple algorithm based on surface energy considerations may inform which interfacial layer for a given bulk heterojunction in an organic photovoltaic device can be the most appropriate.

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Hole Transporting Layers in Printable Solar Cells

Curiel

Más‐Montoya

2017

Printable Solar Cells

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Ultrathin Anode Buffer Layer for Enhancing Performance of Polymer Solar Cells

Cited by 8 publications

References 23 publications

Functional solid additive modified PEDOT:PSS as an anode buffer layer for enhanced photovoltaic performance and stability in polymer solar cells

Functional solid additive modified PEDOT:PSS as an anode buffer layer for enhanced photovoltaic performance and stability in polymer solar cells

How to Choose an Interfacial Modifier for Organic Photovoltaics Using Simple Surface Energy Considerations

Hole Transporting Layers in Printable Solar Cells

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