Performance enhancement of inverted polymer solar cells with fullerene ester derivant-modified ZnO film as cathode buffer layer

Li, Pandeng; Li, Xiaofang; Sun, Chunming; Wang, Guojie; Li, Jun; Jiu, Tonggang; Fang, Junfeng

doi:10.1016/j.solmat.2014.03.038

Cited by 29 publications

(28 citation statements)

References 46 publications

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“…Among the most efficient methods to modify the ZnO surface are the ultraviolet (UV) or UV-ozone treatment, [32][33][34][35][36][37] and the incorporation of a surface modification interlayer, such as a coordination polymer 38,39 or a self-assembled monolayer (SAM). [40][41][42][43][44] However, UV treatment may cause severe degradation of the device lifetime whereas the insulating properties of coordination polymers results in a trade-off between effective passivation and charge transport. In addition, the fabrication of large-area, compact and dense SAMs, which are resistant to subsequent processing procedures, is still challenging.…”

Section: Introductionmentioning

confidence: 99%

Surface passivation effect by fluorine plasma treatment on ZnO for efficiency and lifetime improvement of inverted polymer solar cells

et al. 2016

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Section: Introductionmentioning

confidence: 99%

Surface passivation effect by fluorine plasma treatment on ZnO for efficiency and lifetime improvement of inverted polymer solar cells

et al. 2016

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“…Recently, the performance of inverted‐type OPVs has been further improved by inserting interfacial layers (interlayers) between the photoactive polymer:fullerene layer and the indium‐tin‐oxide (ITO) electrode or metal oxide electron‐collecting buffer layers . The role of the interlayers includes making the physical contacts between the metal oxide buffer layers and polymer:fullerene layers better which in turn leads to reduced electrical resistance .…”

Section: Introductionmentioning

confidence: 99%

“…The role of the interlayers includes making the physical contacts between the metal oxide buffer layers and polymer:fullerene layers better which in turn leads to reduced electrical resistance . Additionally, use of interlayers has been shown to lead to significant work function shift in the metal oxide layers leading to improved device efficiency due to the significantly enhanced open‐circuit voltage ( V OC ) and short‐circuit current density ( J SC ) …”

Section: Introductionmentioning

confidence: 99%

>10% Efficiency Polymer:Fullerene Solar Cells with Polyacetylene‐Based Polyelectrolyte Interlayers

Nam

Seo

Han

et al. 2016

Adv Materials Inter

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Polymer solar cells have gained great attention due to their tremendous potential for applications in light-weight, large-area, and flexible photovoltaic modules fabricated via continuous roll-to-roll processes. Despite the significant progress, however, their efficiency and operating stability are still inadequate for commercial applications. Interfacial engineering of the electron-collecting buffer layer and the organic photoactive layer through the use of organic dipole interlayers, has been proposed as a simple and scalable way to improve the overall solar cell performance. Here, highly efficient inverted polymer:fullerene solar cells have been successfully developed with a power conversion efficiency of over 10%. The bulk heterojunction layer consists of the poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b]dithiophene-alt-3-fluorothieno[3,4-b]thiophene-2-carboxylate] (PTB7-Th) and the [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM), as the electron donor and electron acceptor, respectively. Key to this success is the insertion of the ionic polyacetylene-based conjugated polymer, poly(N-dodecyl-2-ethynylpyridinium bromide), as an interfacial dipole layer. The latter is shown to lower the work function of the electron transporting zinc oxide layer and increase the built-in potential, consequently facilitating efficient charge transport/extraction. Optimized solar cells exhibit power conversion efficiency values exceeding 10% while their operating stability under continuous solar-simulated illumination is significantly enhanced when ultraviolet light is effectively blocked using a suitable optical filter.

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“…To get the energy level alignment of various device components, the cyclic voltammetry (CV) was carried out to investigate the electrochemical properties of PC 71 BM. 42 The energy levels of ZnO NPs were determined by ultraviolet photoelectron spectroscopy (UPS) and the UV absorption edge. 31 The electronic energy levels of PTB7 and MoO 3 were taken from the literatures.…”

Section: Resultsmentioning

confidence: 99%

Solvents Induced ZnO Nanoparticles Aggregation Associated with Their Interfacial Effect on Organic Solar Cells

Jiu

Tang

et al. 2014

ACS Appl. Mater. Interfaces

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ZnO nanofilm as a cathode buffer layer has surface defects due to the aggregations of ZnO nanoparticles, leading to poor device performance of organic solar cells. In this paper, we report the ZnO nanoparticles aggregations in solution can be controlled by adjusting the solvents ratios (chloroform vs methanol). These aggregations could influence the morphology of ZnO film. Therefore, compact and homogeneous ZnO film can be obtained to help achieve a preferable power conversion efficiency of 8.54% in inverted organic solar cells. This improvement is attributed to the decreased leakage current and the increased electron-collecting efficiency as well as the improved interface contact with the active layer. In addition, we find the enhanced maximum exciton generation rate and exciton dissociation probability lead to the improvement of device performance due to the preferable ZnO dispersion. Compared to other methods of ZnO nanofilm fabrication, it is the more convenient, moderate, and effective to get a preferable ZnO buffer layer for high-efficiency organic solar cells.

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Performance enhancement of inverted polymer solar cells with fullerene ester derivant-modified ZnO film as cathode buffer layer

Cited by 29 publications

References 46 publications

Surface passivation effect by fluorine plasma treatment on ZnO for efficiency and lifetime improvement of inverted polymer solar cells

Surface passivation effect by fluorine plasma treatment on ZnO for efficiency and lifetime improvement of inverted polymer solar cells

>10% Efficiency Polymer:Fullerene Solar Cells with Polyacetylene‐Based Polyelectrolyte Interlayers

Solvents Induced ZnO Nanoparticles Aggregation Associated with Their Interfacial Effect on Organic Solar Cells

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