Molecular orientation control of semiconducting molecules using a metal layer formed by wet processing

Yamamoto, Kohei; Shahiduzzaman, Md.; Yamada, Akihiro; Takaya, Tomotsugu; Chikamatsu, Tatsuki; Koganezawa, Tomoyuki; Karakawa, Makoto; Takahashi, Kohshin; Taima, Tetsuya

doi:10.1016/j.orgel.2018.09.008

Cited by 11 publications

(9 citation statements)

References 23 publications

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“…[50] This donor SM has been shown to result in impressive performance with the fullerene acceptor [6,6]-Phenyl-C70-butyric acid methyl ester (PC70BM) as well as several NFAs. [51][52][53] The stability of various standard architecture SM OPVs (including DRCN5T: PC70BM) has been reported by Cheacharoen et al who showed that heating the films, either on a hotplate or during exposure to visible light, leads to significant burn-in within 100 hours, attributed to morphological changes in the nanostructure of the blend. [54] Min et al investigated the stability of encapsulated standard architecture DRCN5T:PC70BM devices with a focus on the role of the active layer microstructure on the degradation dynamics.…”

Section: Introductionmentioning

confidence: 87%

“…One particularly interesting small molecule donor 2,2′‐ [(3,3″′,3″″,4′‐tetraoctyl[2,2′:5′,2″:5″,2″′:5″′,2″″‐ quinquethiophene]‐5,5″″‐diyl) bis[(Z)‐methylidyne(3‐ethyl‐4‐oxo‐5,2‐thiazolidinediylidene)]] bis‐propanedinitrile (DRCN5T) was first designed and synthesized by Y. Chen and co‐workers in 2015 . This donor SM has been shown to result in impressive performance with the fullerene acceptor [6,6]‐Phenyl‐C70‐butyric acid methyl ester (PC 70 BM) as well as several NFAs . The stability of various standard architecture SM OPVs (including DRCN5T: PC 70 BM) has been analyzed by Cheacharoen et al who showed that heating the films, either on a hotplate or during exposure to visible light, leads to a significant burn‐in within 100 h, attributed to morphological changes in the nanostructure of the blend .…”

Section: Introductionmentioning

confidence: 99%

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Energy Transfer to a Stable Donor Suppresses Degradation in Organic Solar Cells

Weu

Kumar

Butscher

et al. 2019

Adv Funct Materials

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Despite many advances toward improving the stability of organic photovoltaic devices, environmental degradation under ambient conditions remains a challenging obstacle for future application. Particularly conventional systems employing fullerene derivatives are prone to oxidize under illumination, limiting their applicability. Here, the environmental stability of the small molecule donor DRCN5T together with the fullerene acceptor PC 70 BM is reported. It is found that this system exhibits exceptional device stability, mainly due to almost constant short-circuit current. By employing ultrafast femtosecond transient absorption spectroscopy, this remarkable stability is attributed to two separate mechanisms: 1) DRCN5T exhibits high intrinsic resistance toward external factors, showing no signs of deterioration.2) The highly sensitive PC 70 BM is stabilized against degradation by the presence of DRCN5T through ultrafast, long-range energy transfer to the donor, rapidly quenching the fullerene excited states which are otherwise precursors for chemical oxidation. It is proposed that this photoprotective mechanism be utilized to improve the device stability of other systems, including nonfullerene acceptors and ternary blends.

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Energy Transfer to a Stable Donor Suppresses Degradation in Organic Solar Cells

Weu

Kumar

Butscher

et al. 2019

Adv Funct Materials

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“…[59] The Ewald sphere corrected pole figures for lamellar (100) peak are shown in Figure 4C and the relative detailed description are shown in the Table S5, Supporting Information. [24,60,61] The face-on to edgeon ratios of the PPH films increase from 30 to 45 °C and then decrease at 50 °C (Table S5, Supporting Information) with the maximum of 8.85 at 45 °C. It is worth noting that improved potion of face-on with respect to the substrate at 45 °C will lead to the more favorable morphology with higher exciton dissociation efficiency and less recombination losses as compared to the other blend morphologies.…”

Section: Baseplate Temperature [°C]mentioning

confidence: 99%

Baseplate Temperature‐Dependent Vertical Composition Gradient in Pseudo‐Bilayer Films for Printing Non‐Fullerene Organic Solar Cells

Zheng

Sun

Zhang

et al. 2021

Advanced Energy Materials

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Numerous previous reports on the sequential deposition (SD) technique have demonstrated that this approach can achieve a p‐i‐n active layer architecture with an ideal vertical composition gradient, which is one of the critical factors that can influence the physical processes that determine the photovoltaic performance of organic solar cells. Herein, a commonly used photovoltaic system comprised of PM6 as a donor and Y6 as an acceptor is investigated with respect to sequential blade‐processing deposition to comprehensively explore the morphology characteristics as a function of baseplate temperature. A systematic study of the temperature‐dependent blend morphology elucidates the SD‐processed configuration merits and device physics behind temperature‐controlled degree of vertical composition gradient, and constructs the temperature‐microstructure‐property relationship for the corresponding photovoltaic parameters. The result shows, as the temperature increases, the morphology of the active layer has undergone a distinct evolution from the pseudo‐bulk heterojunction to a pseudo‐planar heterojunction and then to a pseudo‐planar bilayer, leading to a non‐monotonic correlation between baseplate temperature and device performance. This investigation not only reveals the importance of precisely controlling baseplate temperature for gaining vertical morphology control, but also provides a path toward rational optimization of device performance in the lab‐to‐fab transition.

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“…Over the last two decades, organic photovoltaics (OPVs) have emerged as the next generation of solar energy devices having low-cost, light weight, flexibility, and desirable energy harvesting characteristics. − Recently, an OPV with a power conversation efficiency (PCE) of 17.3% has been reported . A few leading device architectures, such as bulk heterojunctions (BHJs), interpenetrating networks, and planar heterojunctions (PHJs), are available for OPVs. In OPVs with the BHJ architecture, the mixed donor/acceptor material is sandwiched between two electrodes .…”

Section: Introductionmentioning

confidence: 99%

Switchable Crystal Phase and Orientation of Evaporated Zinc Phthalocyanine Films for Efficient Organic Photovoltaics

et al. 2020

Self Cite

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In photovoltaic cells, increasing the light absorption coefficient enhances the photocurrent and quantum efficiency of the cell. Here, we report an efficient approach that enhances light absorption by changing the crystal phase of an evaporated ZnPc film on indium tin oxide (ITO) substrates. Under thermal treatment (>200 °C), the crystal phase of ZnPc changed from metastable α-ZnPc to stable β-ZnPc. We tested and compared the effects of this phase transition on the donor film of organic photovoltaic (OPV) cells. After treating the β-ZnPc film at 220 °C, the short-circuit current of the OPV was improved from 2.58 to 3.40 mA/cm2, and the quantum efficiency was improved from 650 to 750 nm. Moreover, on a copper iodide (CuI)–ITO substrate, the ZnPc molecules were precisely controlled in the lying-down orientation. With their lying-down orientations, the light absorbance capacities of the metastable α-ZnPc phase and stable β-ZnPc phase (annealed at 300 °C) were 1.3- and 1.5-fold higher, respectively, than that of metastable α-ZnPc standing upright on the ITO substrate. This work provides a fundamental understanding of the crystal phases and orientation changes of the ZnPc molecules, enabling maximization of the light absorption coefficient and the design of efficient small-molecule OPV cells.

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Molecular orientation control of semiconducting molecules using a metal layer formed by wet processing

Cited by 11 publications

References 23 publications

Energy Transfer to a Stable Donor Suppresses Degradation in Organic Solar Cells

Energy Transfer to a Stable Donor Suppresses Degradation in Organic Solar Cells

Baseplate Temperature‐Dependent Vertical Composition Gradient in Pseudo‐Bilayer Films for Printing Non‐Fullerene Organic Solar Cells

Switchable Crystal Phase and Orientation of Evaporated Zinc Phthalocyanine Films for Efficient Organic Photovoltaics

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