Molecular Ordering and Performance of Ternary Nonfullerene Organic Solar Cells via Bar-Coating in Air with an Efficiency over 13%

Mao, Yuchao; Guo, Chuanhang; Li, Donghui; Li, Wei; Du, Baocai; Chen, Mengxue; Wang, Yalun; Liu, Dan; Wang, Tao

doi:10.1021/acsami.9b14464

Cited by 22 publications

(22 citation statements)

References 50 publications

(69 reference statements)

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“…Among various morphology optimization strategies, the additive strategy has been thriving since the early stage of BHJ OSCs based on fullerene electron acceptors, [ 21–23 ] and are continuously involved in NFA‐based OSCs. [ 24–28 ] Liquid additives such as 1,8‐diiodooctane (DIO), [ 29 ] diphenyl ether (DPE), and 1‐chloronaphthalene (CN) have been demonstrated to enhance the molecular stacking [ 30,31 ] and crystallinity, [ 32 ] form appropriate phase separation, [ 33 ] increase light absorbance, [ 34,35 ] promote charge separation and transport, [ 36–38 ] and finally improve the photovoltaic performance of OSCs. [ 35,39–41 ] However, a common property of these liquid additives is that they have a relatively high boiling point compared to the primary solvent, making them reluctant to evaporate during solution casting, and even harder to escape in the virtually dried active layer.…”

Section: Introductionmentioning

confidence: 99%

Simultaneously Enhanced Efficiency and Operational Stability of Nonfullerene Organic Solar Cells via Solid‐Additive‐Mediated Aggregation Control

Zhang

Cai

Guo

et al. 2021

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The additive strategy is widely used in optimizing the morphology of organic solar cells (OSCs). The majority of additives are liquid with high boiling points, which will be trapped within device and consequently deteriorate performance during operation. In this work, solid but volatile additives 2‐(4‐fluorobenzylidene)‐1H‐indene‐1,3(2H)‐dione (INB‐F) and 2‐(4‐chlorobenzylidene)‐1H‐indene‐1,3(2H)‐dione (INB‐Cl) are designed to replace the common 1,8‐diiodooctane (DIO) in nonfullerene OSCs. These additives present during solution casting but evaporate after moderate heating. Molecular dynamics simulations show that they can reduce the adsorption energy to improve π‐π stacking among nonfullerene acceptor (NFA) molecules, an effect that enhances light absorption and electron mobility. Both INB‐F and INB‐Cl enhance efficiency, with INB‐F achieving a maximum efficiency of 16.7% from 15.1% of the reference PBDB‐T‐2F (PM6):BTP‐BO‐4F (Y6‐BO) cell, and outperforming DIO. Remarkably, they can simultaneously enhance the operational stability, with the INB‐F‐treated OSC maintaining over 60% of the initial efficiency after 1000 h operation, demonstrating a T80 lifetime of 523 h, which is a significant improvement over T80 values of 66.2 h for the reference and 6.6 h for DIO‐treated OSC. The simultaneously enhanced efficiency and operational lifetime are also effective in PM6:BTP‐BO‐4Cl (Y7‐BO) OSCs, demonstrating a universal strategy to improve the performance of OSCs.

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Section: Introductionmentioning

confidence: 99%

Simultaneously Enhanced Efficiency and Operational Stability of Nonfullerene Organic Solar Cells via Solid‐Additive‐Mediated Aggregation Control

Zhang

Cai

Guo

et al. 2021

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“…For example, in a solution state, conjugated molecules can interact and π–π stack together to derivate properties away from those of a single molecular state [24–27] . During the film casting process, conjugated molecules form close contacts as a result of solvent evaporation and new aggregation and ordered structure can form, with the kinetics of solvent evaporation and thermodynamics during this process have a complex influence on the film morphology [28–32] . Upon thermal annealing post‐treatment to solid state film, molecular diffusion and rearrangement can be promoted towards ordered/disordered states [33, 34] …”

Section: Introductionmentioning

confidence: 99%

Temperature Induced Aggregation of Organic Semiconductors

Yan

et al. 2020

Chemistry A European J

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One important feature of organic semiconductors is their solution processability, which allows researchers to tune their aggregation states in solution and solid states and to control the processing conditions to reach desirable electronic and optoelectronic properties. Temperature is one of the most important processing parameters of organic semiconductors and has been studied extensively particularly for those conjugated small‐ and macro‐ molecules with strong temperature‐dependent aggregation properties. This minireview summarizes the temperature‐induced aggregation behaviors of organic semiconductors in solution, during solution casting and upon thermal annealing post‐treatment of solid‐state thin films. The influences of different aggregation states on the optoelectronic properties, in particular the photovoltaic properties, are discussed. The conclusions in this work will provide a rational guide to precisely control the aggregation states of organic semiconductors to fabricate high‐performance optoelectronic devices.

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“…This surface would enlarge the interface area between DBP and C 60 , thus beneficial for charge separation. [ 24 ]…”

Section: Resultsmentioning

confidence: 99%

Investigation of the Characteristic of Solution‐Processed Tetraphenyldibenzoperiflanthene (DBP) Film and Its Application on Organic Photovoltaic Cells

Zheng

Chen

et al. 2021

Physica Status Solidi (a)

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Solution‐processed tetraphenyldibenzoperiflanthene (DBP) films are prepared with three popular solvents, including chroloform (CF), chrolobenzene (CB), and dichrolobenzene (ODCB). The absorption and photoluminescence (PL) spectra of the DBP solution and DBP film are investigated. The absorption spectra between the DBP film and DBP solution are similar, whereas the PL spectrum shape of the DBP film and DBP solution is completely different, originating from the DBP molecular aggregation in the film, causing conjugate expansion, which results in dimer luminescence. The DBP donor layer at 32 nm prepared from solvent of CF, CB, and ODCB achieves a power conversion efficiency (PCE) of 1.42%, 0.88%, and 0.48%, respectively. The annealing temperature and DBP thickness are optimized; the 32 nm‐thick active layer annealed at 50 °C achieves the highest performance. The CF‐DBP film represents an interpenetrating network morphology, slightly higher roughness and hole mobility, which may be the main contribution to the relatively higher photocurrent than the CB‐DBP and ODCB‐DBP devices. Herein, a simple guidance for preparing solution‐processed DBP films is provided and simultaneously its application on organic photovoltaic cells (OPVs) is expanded.

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Molecular Ordering and Performance of Ternary Nonfullerene Organic Solar Cells via Bar-Coating in Air with an Efficiency over 13%

Cited by 22 publications

References 50 publications

Simultaneously Enhanced Efficiency and Operational Stability of Nonfullerene Organic Solar Cells via Solid‐Additive‐Mediated Aggregation Control

Simultaneously Enhanced Efficiency and Operational Stability of Nonfullerene Organic Solar Cells via Solid‐Additive‐Mediated Aggregation Control

Temperature Induced Aggregation of Organic Semiconductors

Investigation of the Characteristic of Solution‐Processed Tetraphenyldibenzoperiflanthene (DBP) Film and Its Application on Organic Photovoltaic Cells

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