Achieving 17.5% efficiency for polymer solar cells <i>via</i> a donor and acceptor layered optimization strategy

Xu, Wenjing; Li, Xiong; Jeong, Sang Young; Son, Jae Hoon; Zhou, Zhengji; Jiang, Qiuju; Woo, Han Young; Wu, Qinghe; Zhu, Xixiang; Zhang, Fujun

doi:10.1039/d2tc00024e

Cited by 53 publications

(45 citation statements)

References 58 publications

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“…The more ordered face‐on arrangement favors charge transport in the active layer along the normal direction of substrate, which has been commonly reported in many literatures. [ 48–50 ] The molecular crystal coherence length (CCL) in neat and blend films was calculated by Scherrer's formula: CCL = 2 π k/Δ q , [ 51–54 ] where k is Scherrer's constant and its typical value is 0.9, and Δ q is the full‐width at half‐maximum of diffraction peak, as listed in Table S2 (Supporting Information). The CCL values of π – π stacking and lamellar stacking in blend films are enhanced from 1.89 to 2.24 nm, and from 7.96 to 8.08 nm by adding Y6 as the third component.…”

Section: Resultsmentioning

confidence: 99%

Boosted Efficiency Over 18.1% of Polymer Solar Cells by Employing Large Extinction Coefficients Material as the Third Component

Zhang

et al. 2022

Macromol. Rapid Commun.

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A series of binary and ternary polymer solar cells (PSCs) is successfully fabricated. The optimal ternary PSCs achieve a power conversion efficiency (PCE) of 18.14%, benefiting from the increased short circuit current density (JSC) of 26.53 mA cm−2 and fill factor (FF) of 78.51% in comparison with the JSCs (25.05 mA cm−2 and 25.65 mA cm−2) and the FFs (77.13% and 76.55%) of the corresponding binary PSCs. The photon harvesting ability of ternary active layers can be enhanced, which can be confirmed from the EQE spectral difference of the optimized ternary and binary PSCs, especially in the wavelength range from 680 nm to 800 nm. The refractive index and extinction coefficients of binary and ternary blend films are measured, which can well support the enhanced photon harvesting ability in different wavelength ranges. Photogenerated exciton distribution in active layers is simulated by the transmission matrix method based on the Beer–Lambert law. The photogenerated exciton density can be enhanced in the middle of the active layers by incorporating a third component in acceptors, which is conducive to charge collection by individual electrodes, resulting in the simultaneously enhanced JSC and FF of the optimal ternary PSCs.

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Section: Resultsmentioning

confidence: 99%

Boosted Efficiency Over 18.1% of Polymer Solar Cells by Employing Large Extinction Coefficients Material as the Third Component

Zhang

et al. 2022

Macromol. Rapid Commun.

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“…These cells use the photoelectric effect to convert light into electricity in a direct manner. Various kinds of solar cells, including perovskite, hybrid, polymer, dye-sensitized and organic solar cells have been developed during this period [ 6 , 7 , 8 , 9 , 10 ]. Researchers are particularly interested in perovskite solar cells (PSCs) because of their ease of production, cheap cost and high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Bi and Sn Doping Improved the Structural, Optical and Photovoltaic Properties of MAPbI3-Based Perovskite Solar Cells

et al. 2022

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One of the most amazing photovoltaic technologies for the future is the organic–inorganic lead halide perovskite solar cell, which exhibits excellent power conversion efficiency (PCE) and can be produced using a straightforward solution technique. Toxic lead in perovskite can be replaced by non-toxic alkaline earth metal cations because they keep the charge balance in the material and some of them match the Goldschmidt rule’s tolerance factor. Therefore, thin films of MAPbI3, 1% Bi and 0%, 0.5%, 1% and 1.5% Sn co-doped MAPbI3 were deposited on FTO-glass substrates by sol-gel spin-coating technique. XRD confirmed the co-doping of Bi–Sn in MAPbI3. The 1% Bi and 1% Sn co-doped film had a large grain size. The optical properties were calculated by UV-Vis spectroscopy. The 1% Bi and 1% Sn co-doped film had small Eg, which make it a good material for perovskite solar cells. These films were made into perovskite solar cells. The pure MAPbI3 film-based solar cell had a current density (Jsc) of 9.71 MA-cm−2, its open-circuit voltage (Voc) was 1.18 V, its fill factor (FF) was 0.609 and its efficiency (η) was 6.98%. All of these parameters were improved by the co-doping of Bi–Sn. The cell made from a co-doped MAPbI3 film with 1% Bi and 1% Sn had a high efficiency (10.03%).

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“…What’s more, as shown in Figure 4a ∼ c, it's quite visible that the roughness is reduced after the halogenation of J52 . The substitution of F and Cl atoms leads to good mixtures of the polymer with i‐IEICO‐4F, which may result from the molecular crystallization induced by halogenation [49–50] …”

Section: Resultsmentioning

confidence: 99%

Efficient Polymer Solar Cells Facilitated by Halogenated Substituted Wide‐Bandgap Polymers and a Backbone Twisted Low‐Bandgap Acceptor

Liu¹,

Wu²,

Zhao³

et al. 2022

ChemistrySelect

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During the past five years, plentiful efficient polymer solar cells (PSCs) developed rapidly with the application of small molecules as non-fullerene acceptors (NFAs). Although most of the synthesized NFAs have planar backbones, the backbone twisted NFAs have exhibited impressive performances in devices with wide-bandgaps polymer donors like J52 and PBDB-T. To boost the performances of PSCs based on NFAs with contorting backbone, a systematic study of a twisted NFA (i-IEICO-4F), with J52 and its halogenated counterparts was conducted, because the attached halogen atoms have strong effects on the frontier molecular orbitals and the aggregation properties of the polymers. Despite the polymers possessing similar absorption spectra, they exhibited continuously deep-ened molecular energy levels. Among the three polymers, the device based on J52-2F and i-IEICO-4F achieved the lowest efficiency of 11.78 %. Although differed in open-circuit voltages and short-circuit current densities, the J52-and J52-2Cl-based devices successfully acquired enhanced fill factors of 67.0 % and 67.6 %, giving rise to enhanced efficiencies of 12.47 % and 12.69 %. The superior performance of J52-2Cl-based device stems from its deepened molecular energy levels, improved charge transport properties, and better morphological features, demonstrating the important influence of halogenation substitution on the characteristic regulation of wide-bandgap conjugated polymers for high-performance PSCs.

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Achieving 17.5% efficiency for polymer solar cells via a donor and acceptor layered optimization strategy

Abstract: Layer-by-layer polymer solar cells (LbL-PSCs) were prepared with PNTB6-Cl as donor and Y6 as acceptor by sequential spin-coating method. Two solvent additives DPE and DFB were individually incorporated into PNTB6-Cl...

Cited by 53 publications

References 58 publications

Boosted Efficiency Over 18.1% of Polymer Solar Cells by Employing Large Extinction Coefficients Material as the Third Component

Boosted Efficiency Over 18.1% of Polymer Solar Cells by Employing Large Extinction Coefficients Material as the Third Component

Bi and Sn Doping Improved the Structural, Optical and Photovoltaic Properties of MAPbI3-Based Perovskite Solar Cells

Efficient Polymer Solar Cells Facilitated by Halogenated Substituted Wide‐Bandgap Polymers and a Backbone Twisted Low‐Bandgap Acceptor

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