A guest-assisted molecular-organization approach for &gt;17% efficiency organic solar cells using environmentally friendly solvents

Chen, Haiyang; Zhang, Rui; Chen, Xiaobin; Zeng, Guang Sheng; Kobera, Libor; Abbrent, Sabina; Zhang, Ben; Chen, Weijie; Xu, Guiying; Oh, Jiyeon; Kang, So‐Huei; Chen, Shanshan; Yang, Changduk; Brus, Jiřı́; Hou, Jianhui; Gao, Feng; Li, Yaowen; Li, Yongfang

doi:10.1038/s41560-021-00923-5

Cited by 302 publications

(266 citation statements)

References 46 publications

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“…The results confirm the stronger aggregate for the Y6-based films processed from CB. [30,35] Space-charge limited current (SCLC) method has been carried out to investigate the charge transport properties of PM6:NFAs blend films. The hole-only devices (ITO/PEDOT: PSS/Active Layer/MoO 3 /Ag) and the electron-only devices (ITO/PEI-Zn/Active Layer/PDINN/Ag) have been fabricated to measure the carrier mobility.…”

Section: (5 Of 8)mentioning

confidence: 99%

“…This is because the face-on orientation is weak for the PM6:Y6 films processed from high-boiling-point solvent. [33,35] When the acceptor is changed to BTP-eC9, the PM6:BTP-eC9 films processed from the two solvents show nearly identical reflection angles with broad signals in the region of 20° to 36°. The change of active layer aggregation makes a huge difference in device performances.…”

Section: (5 Of 8)mentioning

confidence: 99%

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Large‐Area Organic Solar Modules with Efficiency Over 14%

Dong

Jiang

Sun

et al. 2021

Adv Funct Materials

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It is still challenging to fabricate efficient large-area organic solar modules by solution processing. Processing window is important to obtain optimal aggregation of an active layer in large area for high efficiency. The star active layer of PM6:Y6 is processed from chloroform (for high efficiency) that has a narrow processing window due to the low boiling point of the solvent. In this work, the correlation between chemical structure (side chains) and processing solvents is investigated to obtain high efficiency and long processing windows. It is found that large side chains on the pyrrole ring are the key factor influencing the aggregation of active layer films. Short side chain (in Y6 and Y6-1O) will cause excess aggregation when processed from high-boiling-point solvent (chlorobenzene, CB), while long side-chain (in BTP-BO-4F, BTP-BO-4Cl, and BTP-eC9) can inhibit such aggregation and maintain high photovoltaic performance when processed from CB with wide processing window. In the end, over 25 cm 2 organic solar module via doctor blading based on PM6:BTP-eC9 active layer has been fabricated with a PCE of 14.07%.

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Section: (5 Of 8)mentioning

confidence: 99%

Section: (5 Of 8)mentioning

confidence: 99%

Large‐Area Organic Solar Modules with Efficiency Over 14%

Dong

Jiang

Sun

et al. 2021

Adv Funct Materials

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“…In recent years, the power conversion efficiency (PCE) of single-junction bulk-heterojunction organic solar cells (OSCs) has increased rapidly to values exceeding 18%. [1][2][3][4][5] The great improvement of device performance can be mainly attributed to the development of new electron-accepting/donating materials, [6][7][8][9][10][11] optimizing the morphology of active layers, [12,13] interfacial engineering, [14][15][16] and exploring new device structures. [17,18] However, the PCEs of OSCs still lag behind the inorganic or perovskite photovoltaic cells, in most part due to the modest open circuit voltage (VOC) imposed by the relatively large photon energy.…”

Section: Introductionmentioning

confidence: 99%

Origin of the Additive‐Induced V_OC Change in Non‐Fullerene Organic Solar Cells

Wang

Feng

Liu

et al. 2022

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Additives are often used to adjust the morphology of the active layer to improve the performance of organic solar cells (OSCs). Here, taking typical high‐efficiency non‐fullerene systems as examples, the effect of the additive on the device performance in non‐fullerene OSCs is systematically investigated. Surprisingly, an unpresented VOC change is observed in the opposite direction of the two typical systems (PM6:Y6 and PTB7‐Th: ITIC) appearing after the incorporation of the additive DIO, which can be affected by the morphological differences as indicated by the several morphological studies. The bewildering VOC change caused by the additive in different material systems is supposed to originate from the different energy level variations as verified by the energy level studies. Molecular dynamic (MD) and density functional theory (DFT) calculations are also included to get an insight into the dynamic of the additive‐induced morphological differences that are supposed to contribute to the energy level changes. Combining a series of morphological and energic studies as well as the theoretical calculations, the origin of unforeseeable VOC changes caused by additives in non‐fullerene OSCs is clarified, and provides in‐depth insights into the effects of additives on device performance.

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“…Organic photovoltaics (OPVs) have made significant progress in recent years, as a result of rapid evolution in photoactive materials and device architecture design. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Currently, the best power conversion efficiency (PCE) of OPVs has reached around 20%, as has been certified by a variety of third-part authorities. [21] Nevertheless, the OPV efficiency is still inferior compared to inorganic counterparts, due to their large energy loss coming largely from the weak van der Waals intermolecular interactions of organic semiconductors, which renders high exciton binding energy.…”

Section: Introductionmentioning

confidence: 99%

High‐Efficiency ITO‐Free Organic Photovoltaics with Superior Flexibility and Upscalability

et al. 2022

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Developing indium‐tin‐oxide (ITO)‐free flexible organic photovoltaics (OPVs) with upscaling capacity is of great significance for practical applications of OPVs. Unfortunately, the efficiencies of the corresponding devices lag far behind those of ITO‐based rigid small‐area counterparts. To address this issue, an advanced device configuration is designed and fabricated featuring a top‐illuminated structure with ultrathin Ag as the transparent electrode. First, a conjugated polyelectrolyte layer, i.e., PCP‐Li, is inserted to effectively connect the bottom Ag anode and the hole transport layer, achieving good photon to electron conversion. Second, charge collecting grids are deposited to suppress the increased resistance loss with the upscaling of the device area, realizing almost full retention of device efficiency from 0.06 to 1 cm2. Third, the designed device delivers the best efficiency of 15.56% with the area of 1 cm2 on polyimide substrate, representing as the record among the ITO‐free, large‐area, flexible OPVs. Interestingly, the device exhibits no degradation after 100 000 bending cycles with a radius of 4 mm, which is the best result for flexible OPVs. This work provides insight into device structure design and optimization for OPVs with high efficiency, low cost, superior flexibility, and upscaling capacity, indicating the potential for the future commercialization of OPVs.

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A guest-assisted molecular-organization approach for >17% efficiency organic solar cells using environmentally friendly solvents

Cited by 302 publications

References 46 publications

Large‐Area Organic Solar Modules with Efficiency Over 14%

Large‐Area Organic Solar Modules with Efficiency Over 14%

Origin of the Additive‐Induced V_OC Change in Non‐Fullerene Organic Solar Cells

High‐Efficiency ITO‐Free Organic Photovoltaics with Superior Flexibility and Upscalability

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A guest-assisted molecular-organization approach for >17% efficiency organic solar cells using environmentally friendly solvents

Cited by 302 publications

References 46 publications

Large‐Area Organic Solar Modules with Efficiency Over 14%

Large‐Area Organic Solar Modules with Efficiency Over 14%

Origin of the Additive‐Induced VOC Change in Non‐Fullerene Organic Solar Cells

High‐Efficiency ITO‐Free Organic Photovoltaics with Superior Flexibility and Upscalability

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Origin of the Additive‐Induced V_OC Change in Non‐Fullerene Organic Solar Cells