Surface structure and patterns

(Natural) polymersApplicationCharacterizationCustomer publicationsGISAXSMaterialPhase analysisPolymer researchSelf-assembled materialSurface structure and patternsTechnique

Transition Pathway between Gyroid and Cylindrical Morphology in Linear Triblock Terpolymer Thin Films

Guliyeva, Aynur; Vayer, Marylène; Warmont, Fabienne; Takano, Atsushi; Matsushita, Yushu; Sinturel, Christophe

A new transition between alternating gyroid (GA) structure and cylindrical morphology was observed in thin films for a poly(isoprene-block-styrene-block-(2-vinylpyridine)) (ISP) triblock terpolymer (I/S/P volume fraction = 0.20:0.66:0.14) exhibiting in bulk a Q214 (space group I4132) morphology. Thin films were organized using solvent vapor annealing (SVA) and characterized by atomic force…
27 January 2020
(Natural) polymersApplicationCharacterizationCrystalline fractionCustomer publicationsGISAXSGIWAXSMaterialOrientation analysisRenewable energySurface structure and patternsTechniqueThin films

Comprehensive Investigation and Analysis of Bulk-Heterojunction Microstructure of High-Performance PCE11:PCBM Solar Cells

Zhang, Chaohong; Heumueller, Thomas; Gruber, Wolfgang; Almora, Osbel; Du, Xiaoyan; Ying, Lei; Chen, Junwu; Unruh, Tobias; Cao, Yong; Li, Ning; Brabec, Christoph J.

Worldwide research efforts have been devoted to organic photovoltaics in the hope of a large-scale commercial application in the near future. To meet the industrial production requirements, organic photovoltaics that can reach power conversion efficiency (PCE) of over 10% along with promising operational device stability are of utmost interest. In…
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsGISAXSGIWAXSMaterialRenewable energySurface structure and patternsTechniqueThin films

A top-down strategy identifying molecular phase stabilizers to overcome microstructure instabilities in organic solar cells

Zhang, Chaohong; Heumueller, Thomas; Leon, Salvador; Gruber, Wolfgang; Burlafinger, Klaus; Tang, Xiaofeng; Perea, Jose D.; Wabra, Isabell; Hirsch, Andreas; Unruh, Tobias; Li, Ning; Brabec, Christoph J.

The operational stability of organic solar cells (OSCs) is the essential barrier to commercialization. Compared to thermally-induced degradation, photo-stability of OSCs is far away from being resolved. Here, we demonstrate that the thermal- and photo-degradation of metastable bulk-heterojunction OSCs are governed by the same mechanism. Understanding the fundamental principles behind…
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsGISAXSMaterialOrientation analysisPolymer researchSelf-assembled materialSurface structure and patternsTechniqueThin films

Morphological Evolution of Poly(solketal methacrylate)-block-polystyrene Copolymers in Thin Films

Yu, Duk Man; Smith, Darren M.; Kim, Hyeyoung; Mapas, Jose Kenneth D.; Rzayev, Javid; Russell, Thomas P.

The morphological evolution of the lamellar microdomains in the thin films of symmetric poly(solketal methacrylate-b-styrene) (PSM-b-PS) copolymers that can be converted into poly(glycerol monomethacrylate-b-styrene) (PGM-b-PS) copolymers through acid hydrolysis reaction was investigated. This simple chemical transformation was performed in the solid state using trifluoroacetic acid vapor,…
27 January 2020
ApplicationCharacterizationCustomer publicationsGISAXSInorganic materialInorganic materialsMaterialPorous materialSurface structure and patternsTechnique

Photocatalytic Template Removal by Non-Ozone-Generating UV Irradiation for the Fabrication of Well-Defined Mesoporous Inorganic Coatings

Reid, Barry; Taylor, Alaric; Alvarez-Fernandez, Alberto; Ismael, Muhamad Hafiz; Sharma, Shatakshi; Schmidt-Hansberg, Benjamin; Guldin, Stefan

The processing of mesoporous inorganic coatings typically requires a high-temperature calcination step to remove organic precursors that are essential during the material assembly. Lowering the fabrication energy costs and cutting back on the necessary resources would provide a greater scope for the deployment in applications such as architectural glass, optical…
27 January 2020
(Natural) polymersApplicationCharacterizationCustomer publicationsGIWAXSMaterialPolymer researchSurface structure and patternsTechnique

Addition of Monovalent Silver Cations to CH3NH3PbBr3 Produces Crystallographically Oriented Perovskite Thin Films

Siegler, Timothy D.; Zhang, Yangning; Dolocan, Andrei; Reimnitz, Lauren C.; Torabi, Aida; Abney, Michael K.; Choi, Junho; Cossio, Gabriel; Houck, Daniel W.; Yu, Edward T.; Li, Xiaoqin; Harvey, Taylor B.; Milliron, Delia J.; Korgel, Brian A.

The incorporation of monovalent silver (Ag+) cations into methylammonium lead bromide (CH3NH3PbBr3) perovskite films leads to a strongly preferred (001) crystallographic orientation on a wide variety of substrates, ranging from glass to mesoporous TiO2. CH3NH3PbBr3 films deposited without Ag+ exhibit only a weakly preferred (011) orientation. Compositional maps and depth…
27 January 2020
(Natural) polymersApplicationCharacterizationCustomer publicationsGISAXSMaterialPhase analysisPolymer researchSAXSShapeSizeSurface structure and patternsTechnique

Adjustable self-assembly in polystyrene-block-poly(4-vinylpyridine) dip-coated thin films

Konefa?, Magdalena; Zhigunov, Alexander; Pavlova, Ewa; ?ernoch, Peter; Pop-Georgievski, Ognen; Špírková, Milena

This work studies the influence of dip-coating parameters on self-assembly in ultra-thin films of asymmetric polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) copolymers from a 1-chloropentane solution using a combination of several experimental techniques. Small-Angle X-ray Scattering, Atomic Force Microscopy, Grazing Incidence Small Angle X-ray Scattering and Transmission Electron Microscopy…
27 January 2020
ApplicationCharacterizationCustomer publicationsGIWAXSInorganic materialMaterialRenewable energySurface structure and patternsTechniqueThin films

Tailoring vertical phase distribution of quasi-two-dimensional perovskite films via surface modification of hole-transporting layer

Liu, Tiefeng; Jiang, Youyu; Qin, Minchao; Liu, Junxue; Sun, Lulu; Qin, Fei; Hu, Lin; Xiong, Sixing; Jiang, Xueshi; Jiang, Fangyuan; Peng, Ping; Jin, Shengye; Lu, Xinhui; Zhou, Yinhua

Vertical phase distribution plays an important role in the quasi-two-dimensional perovskite solar cells. So far, the driving force and how to tailor the vertical distribution of layer numbers have been not discussed. In this work, we report that the vertical distribution of layer numbers in the quasi-two-dimensional perovskite films deposited…
25 November 2019
(Natural) polymersApplicationCharacterizationCustomer publicationsFractal dimensionGISAXSGIWAXSMaterialOrientation analysisRenewable energySurface structure and patternsTechniqueThin films

Simply planarizing nonfused perylene diimide based acceptors toward promising non-fullerene solar cells

Bian, Gao-Feng; Zhao, Feng; Lau, Tsz-Ki; Sheng, Chun-Qi; Lu, Xinhui; Du, Hui; Zhang, Cheng; Qu, Zhi-Rong; Chen, Hongzheng; Wan, Jun-Hua

This work focuses on developing high-efficiency perylene diimide (PDI)-based small molecular nonfullerene acceptors with a simple synthetic strategy. We reported a new electron acceptor, Py-e-PDI, obtained via cross-coupling four PDI units with a planar pyrene core through ethynyl groups. Although the ring-fusion synthetic procedure was omitted, the large planar core…
25 November 2019
(Natural) polymersApplicationCharacterizationCustomer publicationsFractal dimensionGISAXSGIWAXSMaterialOrientation analysisRenewable energySurface structure and patternsTechniqueThin films

Single-Junction Organic Solar Cell with over 15% Efficiency Using Fused-Ring Acceptor with Electron-Deficient Core

Yuan, Jun; Zhang, Yunqiang; Zhou, Liuyang; Zhang, Guichuan; Yip, Hin-Lap; Lau, Tsz-Ki; Lu, Xinhui; Zhu, Can; Peng, Hongjian; Johnson, Paul A.; Leclerc, Mario; Cao, Yong; Ulanski, Jacek; Li, Yongfang; Zou, Yingping

Summary Recently, non-fullerene n-type organic semiconductors have attracted significant attention as acceptors in organic photovoltaics (OPVs) due to their great potential to realize high-power conversion efficiencies. The rational design of the central fused ring unit of these acceptor molecules is crucial to maximize device performance. Here, we report a new…
25 November 2019