Effect of H- and J-Aggregation on the Photophysical and Voltage Loss of Boron Dipyrromethene Small Molecules in Vacuum-Deposited Organic Solar Cells

Li, Tianyi; Benduhn, Johannes; Qiao, Zhi; Liu, Yuan; Li, Yue; Shivhare, Rishi; Jaiser, Frank; Wang, Pei; Ma, Jie; Zeika, Olaf; Neher, Dieter; Mannsfeld, Stefan C. B.; Ma, Zaifei; Vandewal, Koen; Leo, Karl

doi:10.1021/acs.jpclett.9b01222

Cited by 36 publications

(22 citation statements)

References 47 publications

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“…The J-aggregation-enhanced charge-carrier mobility was also found in a BODIPY derivative, where the hole mobility of the J-aggregate of BODIPY with remarkable red-shifted absorption showed more than one order of magnitude higher than that of the H-aggregates. 54 Moreover, Bo and co-workers 55 fabricated two oligothiophene derivatives, namely, o-4TBC-2F and m-4TBC-2F, and the former formed J-aggregation after thermal annealing and showed superior absorption red-shift, resulting in a higher charge-carrier mobility and photoconversion efficiency than the latter material without J-aggregation. Although the exquisite relationship between the charge-carrier mobility and super-large red-shifted absorption of a certain aggregate still lacks research, the super-large red-shifted absorption is valuable as the screen of high-performance chargetransporting materials.…”

Section: Optoelectronic Materialsmentioning

confidence: 99%

Assembly Induced Super-Large Red-Shifted Absorption: The Burgeoning Field of Organic Near-Infrared Materials

2021

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Supramolecular assembly of organic dye compounds with J-aggregation leads to a red-shifted absorption spectrum that greatly facilitates the construction of near-infrared (NIR) materials. A considerable improvement of the material functions requires that the absorption red-shift be larger than 100 nm, but such a super-large red-shift is challenging, and the rules leading to the super-large red-shifted absorption is still not explicit. In this review, we focused on those J-aggregated organic dye materials with super-large red-shifted absorption. The nature of the super-large red-shift is originated from the intermolecular charge transfer between neighboring chromophores. The super-large red-shift can be obtained by tuning either the molecular structure or kinetic assembly process in a delicate manner. Materials with super-large red-shifted absorption have been successfully applied to biological imaging, phototherapy, electronic devices, and solar cells, and show great potential in many other fields. The elaboration of assembly induced super-large red-shifted absorption is promising for design of supramolecular NIR materials with tuned structures, enhanced functionalities, and a wide array of applications.

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Section: Optoelectronic Materialsmentioning

confidence: 99%

Assembly Induced Super-Large Red-Shifted Absorption: The Burgeoning Field of Organic Near-Infrared Materials

2021

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“…Recently, they also reported two furan‐fused BODIPYs and adjusted the aggregation mode via the end‐substituents. [ 161 ] Replacing the end H (104a) by F atoms (104b), the aggregation style was changed from H‐ to J‐mode. Finally, the H‐aggregated device was found with reduced nonradiative loss (0.35 vs. 0.49) and higher efficiency (5.5% vs. 4.2%) than the J‐aggregated device.…”

Section: B←n‐embedded Opv Materialsmentioning

confidence: 99%

B←N Coordination: From Chemistry to Organic Photovoltaic Materials

Huang

Wang

Xiang

et al. 2021

Adv Energy and Sustain Res

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Coordination between boron Lewis acid and nitrogen Lewis base (B←N) is a classically chemical issue that has been known for several decades. Recently, this B←N chemistry developed into a new stage toward electronic materials, e.g., adjusting optoelectronic properties of N‐based conjugated molecules via adding B Lewis acids, synthesizing B←N‐bridged conjugated units, and further constructing B←N‐embedded organic photovoltaic (OPV) materials. Herein, these progresses are systematically summarized starting from certain chemical issues concerning B←N coordination, e.g., Lewis acidity of typical B Lewis acids and their interactions with N‐contained conjugated molecules. Then, some fused and ladder‐type B←N‐bridged units are reviewed in terms of the relationship between molecular structures and optoelectronic properties. Finally, the recently flourished B←N‐embedded OPV materials are summarized. The prospect of OPV materials concerning B←N coordination is also proposed, hoping to attract more attention to this filed and motivate its rolling rapidly.

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“…In organic PV it is possible with in situ UV-Vis measurements to investigate how polymer chains orientate (formation of J and H aggregates) in the drying films from which the electronic properties of the finished thin films can be predicted. [127] [128] In the field of perovskite solar cells UV-Vis spectroscopy is mostly used to investigate the total absorbance which is the logarithm of the ratio between transmitted and incident light. Since in practice the incoming light can fluctuate the transmitted light through the sample is divided by the reference measurement.…”

Section: (E-h) False Color Image Of a Mapbi 3 Ef) And A Fapbi 3 Gh)mentioning

confidence: 99%

Optical Absorption‐Based In Situ Characterization of Halide Perovskites

Babbe

Sutter‐Fella

2020

Advanced Energy Materials

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Halide perovskites have emerged as materials for high-performance optoelectronic devices. Often, progress made to date in terms of higher efficiency and stability is based on increasing material complexity that is, formation of multicomponent halide perovskites with multiple cations and anions. In this review article, the use of in situ optical methods, namely photoluminescence (PL) and UV-Vis, that provide access to the relevant time-and length-scales to ascertain chemistry-property relationships by monitoring evolving properties is discussed. Additionally, because halide perovskites are electron-ion conductors and prone to solid-state ion transport under various external stimuli application of these optical methods in the context of ionic movement, is described to reveal mechanistic insights. Finally, examples of using in situ PL and UV-Vis to study degradation and phase transitions are reviewed to demonstrate the wealth of information that can be obtained regarding many different aspects of ongoing research activities in the field of halide perovskites.

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Effect of H- and J-Aggregation on the Photophysical and Voltage Loss of Boron Dipyrromethene Small Molecules in Vacuum-Deposited Organic Solar Cells

Cited by 36 publications

References 47 publications

Assembly Induced Super-Large Red-Shifted Absorption: The Burgeoning Field of Organic Near-Infrared Materials

Assembly Induced Super-Large Red-Shifted Absorption: The Burgeoning Field of Organic Near-Infrared Materials

B←N Coordination: From Chemistry to Organic Photovoltaic Materials

Optical Absorption‐Based In Situ Characterization of Halide Perovskites

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