2022
DOI: 10.1002/adma.202208211
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Fibrillization of Non‐Fullerene Acceptors Enables 19% Efficiency Pseudo‐Bulk Heterojunction Organic Solar Cells

Abstract: The structural order and aggregation of non‐fullerene acceptors (NFA) are critical toward light absorption, phase separation, and charge transport properties of their photovoltaic blends with electron donors, and determine the power conversion efficiency (PCE) of the corresponding organic solar cells (OSCs). In this work, the fibrillization of small molecular NFA L8‐BO with the assistance of fused‐ring solvent additive 1‐fluoronaphthalene (FN) to substantially improve device PCE is demonstrated. Molecular dyna… Show more

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Cited by 161 publications
(134 citation statements)
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References 54 publications
(79 reference statements)
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“…[227,228] At present, the highest efficiency of the devices fabricated by SD method has been more than 19%. [216,[355][356][357] The fabrication process of device by SD method is shown in Figure 20a, and the schematic of the photovoltaic physic processes and the morphology along the vertical direction of the BHJ and pseudo-bilayer films are shown in Figure 20b,c. As can be seen, because of the longer exciton diffusion length and shorter charge transport path, exciton dissociation, charge extraction are effectively enhanced.…”
Section: Stable Vertical Morphology Via Sequential Depositionmentioning
confidence: 99%
See 1 more Smart Citation
“…[227,228] At present, the highest efficiency of the devices fabricated by SD method has been more than 19%. [216,[355][356][357] The fabrication process of device by SD method is shown in Figure 20a, and the schematic of the photovoltaic physic processes and the morphology along the vertical direction of the BHJ and pseudo-bilayer films are shown in Figure 20b,c. As can be seen, because of the longer exciton diffusion length and shorter charge transport path, exciton dissociation, charge extraction are effectively enhanced.…”
Section: Stable Vertical Morphology Via Sequential Depositionmentioning
confidence: 99%
“…Finally, due to the synergistic effects of the multifunctional p-dopant of CS, CS/ PM6/Y6-based PSCs achieved an extraordinary PCE of 17.98%. Wang et al [356] utilized FN as acceptor additive to realize L8-BO with fibril-like morphology. They investigated that the L8-BO fibrils and LBL structure induce enhanced photon harvest and charge transport, and the fabricated devices reached an outstanding PCE of 19.00% and FF of 80.00%.…”
Section: Stable Vertical Morphology Via Sequential Depositionmentioning
confidence: 99%
“…In the past decade, nonfullerene acceptors (NFAs) have attracted considerable attention in organic solar cells (OSCs) with the great stride of power conversion efficiencies (PCEs) to over 19%. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Recently, the rapid development of NFAs was mainly dominated by acceptor-donor-acceptor (A-D-A) type small-molecule acceptors (SMAs), [15][16][17][18][19][20][21][22][23][24][25][26][27] The main reason for great success of the A-D-A type SMAs lies in their easilytuned optoelectronic properties through simple chemical modification on the D and A units. [28][29][30][31][32][33][34][35][36][37] Elegant works have been reported, such as modulating the central units (D) with varied side chains to adjust the crystalline properties and modifying the terminal units (A) by introducing different functional groups to tune the light absorption range and molecular energy level, thus leading to a significant impact on the short-current density ( J sc ), open-circuit voltage (V oc ) and fill factor (FF).…”
Section: Introductionmentioning
confidence: 99%
“…[15][16][17] Thus, significant strides have been made in device performance with the power conversion efficiencies (PCEs) over 19% realized in state-of-theart OSCs. [11,[17][18][19][20][21][22][23][24][25][26] Nevertheless, the performance of OSCs still lags behind that of inorganic or perovskite solar cells due to the relatively large photon energy loss (E loss ). [27] As established, the E loss can be divided into radiative loss and nonradiative loss.…”
mentioning
confidence: 99%