In-line, roll-to-roll morphology analysis of organic solar cell active layers

Rossander, Lea Hildebrandt; Dam, Henrik Friis; Carlé, Jon Eggert; Helgesen, Martin; Rajković, Ivan; Corazza, Michael; Krebs, Frederik C.; Andreasen, Jens Wenzel

doi:10.1039/c7ee01900a

Cited by 57 publications

(39 citation statements)

References 27 publications

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“…The final scattering pattern for both cases after thermal treatment does not exhibit striking differences anymore. Hence, a dissolution process of the initial crystalline grains during the heat treatment is likely present as also observed for perovskite printed on solvent absorbing substrates …”

Section: Resultsmentioning

confidence: 76%

Evolution of Perovskite Crystallization in Printed Mesoscopic Perovskite Solar Cells

et al. 2019

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Additives are frequently used to enhance material properties. The addition of the processing additive 5‐aminovaleric acid iodide (5‐AVAI) into printed mesoscopic perovskite solar cells is shown to have a strong impact on the device performance and stability. Although it is difficult to understand the impact of 5‐AVAI as a processing additive by examining only the final thin films, the evolution of morphology with and without 5‐AVAI reveals that 5‐AVAI influences the crystallization behavior of the perovskite. In situ grazing incidence wide angle X‐ray scattering (GIWAXS) is performed to follow the perovskite formation within the printable all‐porous TiO2/ZrO2/carbon architecture and investigate the influence of 5‐AVAI on the perovskite crystallization within the scaffold. Using such time‐resolved measurements, the suppression of large crystalline perovskite grains is identified early in the fabrication process when 5‐AVAI is present, resulting in improved material backfilling. These observations highlight the importance of 5‐AVAI in the precursor solution for reliable fabrication of printed perovskite solar cells relying on the infiltration of a scaffold structure.

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Section: Resultsmentioning

confidence: 76%

Evolution of Perovskite Crystallization in Printed Mesoscopic Perovskite Solar Cells

et al. 2019

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“…Thus, blade‐coating is deemed to be an efficient strategy to optimize the morphology of active layer in the process of fabricating OSCs. Furthermore, blade‐coating exhibits excellent compatibility with large‐area roll‐to‐roll coating and promising impressive reproducibility of lab‐scale fabrication on large‐scale manufacturing . However, devices remain vulnerable in terms of lifetime stability and under considerable mechanical stress.…”

Section: Detailed Photovoltaic Parameters Of Blade‐coated Oscs Under mentioning

confidence: 97%

Sequential Blade‐Coated Acceptor and Donor Enables Simultaneous Enhancement of Efficiency, Stability, and Mechanical Properties for Organic Solar Cells

Wang

Zhu

Naveed

et al. 2020

Advanced Energy Materials

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As a predominant fabrication method of organic solar cells (OSCs), casting of a bulk heterojunction (BHJ) structure presents overwhelming advantages for achieving higher power conversion efficiency (PCE). However, long‐term stability and mechanical strength are significantly crucial to realize large‐area and flexible devices. Here, controlling blend film morphology is considered as an effective way toward co‐optimizing device performance, stability, and mechanical properties. A PCE of 12.27% for a P‐i‐N‐structured OSC processed by sequential blade casting (SBC) is reported. The device not only outperforms the as‐cast BHJ devices (11.01%), but also shows impressive stability and mechanical properties. The authors corroborate such enhancements with improved vertical phase separation and purer phases toward more efficient transport and collection of charges. Moreover, adaptation of SBC strategy here will result in thermodynamically favorable nanostructures toward more stable film morphology, and thus improving the stability and mechanical properties of the devices. Such co‐optimization of OSCs will pave ways toward realizing the highly efficient, large‐area, flexible devices for future endeavors.

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“…Therefore, developing large‐area manufacture technology of OSC is of great desire to satisfy the needs of wide application for OSCs in the near future. Fortunately, blade‐coating ( Figure b) serving as a prototype tool for slot‐die coating exhibits excellent compatibility with large‐area roll‐to‐roll coating . Recently, the blade‐coated device processed with eco‐friendly solvents achieved a considerable PCE of 10.6% with a device area of 1.0 cm 2 , showing a great prospect toward efficient large‐area device fabrication .…”

Section: Photovoltaic Parameters Of Blade‐coated Ternary Oscs Under Amentioning

confidence: 99%

Achieving Balanced Crystallinity of Donor and Acceptor by Combining Blade‐Coating and Ternary Strategies in Organic Solar Cells

et al. 2018

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As a prototype tool for slot‐die coating, blade‐coating exhibits excellent compatibility with large‐area roll‐to‐roll coating. A ternary organic solar cell based on PBDB‐T:PTB7‐Th:FOIC blends is fabricated by blade‐coating and exhibits a power conversion efficiency of 12.02%, which is one of the highest values for the printed organic solar cells in ambient environment. It is demonstrated that blade‐coating can enhance crystallization of these three materials, but the degree of induction is different (FOIC > PBDB‐T > PTB7‐Th). Thus, the blade‐coated PBDB‐T:FOIC device presents much higher electron mobility than hole mobility due to the very high crystallinity of FOIC. Upon the addition of PTB7‐Th into the blade‐coated PBDB‐T:FOIC blends, the crystallinity of FOIC decreases together with the corresponding electron mobility, due to the better miscibility between PTB7‐Th and FOIC. The ternary strategy not only maintains the well‐matched crystallinity and mobilities, but also increases the photocurrent with complementary light absorption as well as the Förster resonant energy transfer. Furthermore, small domains with homogeneously distributed nanofibers are observed in favor of the exciton dissociation and charge transport. This combination of blade‐coating and ternary strategies exhibits excellent synergistic effect in optimizing morphology, showing great potential in the large‐area fabrication of highly efficient organic solar cells.

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In-line, roll-to-roll morphology analysis of organic solar cell active layers

Abstract: Polymer conformation in solution is more important for R2R solar cell performance than the crystallinity of the final coated film.

Cited by 57 publications

References 27 publications

Evolution of Perovskite Crystallization in Printed Mesoscopic Perovskite Solar Cells

Evolution of Perovskite Crystallization in Printed Mesoscopic Perovskite Solar Cells

Sequential Blade‐Coated Acceptor and Donor Enables Simultaneous Enhancement of Efficiency, Stability, and Mechanical Properties for Organic Solar Cells

Achieving Balanced Crystallinity of Donor and Acceptor by Combining Blade‐Coating and Ternary Strategies in Organic Solar Cells

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