<i>In situ</i>and<i>ex situ</i>investigations on ternary strategy and co-solvent effects towards high-efficiency organic solar cells

Ma, Ruijie; Yan, Cenqi; Fong, W.K.; Yu, Jiangsheng; Liu, Heng; Yin, Jun; Huang, Jianhua; Lu, Xinhui; Yan, He; Li, Gang

doi:10.1039/d2ee00740a

Cited by 91 publications

(85 citation statements)

References 60 publications

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“…For Y-series, it has been widely observed that ternary devices have further improved OSC performances due to enhanced J sc , V oc and FF, better morphology and improved light harvesting. [73][74][75][76][77][78][79][80] Therefore, based on these studies, we further investigate ternary devices of the CH-series and select F-2F 53 (Fig. S13a, ESI †) as the third component to fabricate ternary devices using the same conditions as those of the corresponding binary devices.…”

Section: Photovoltaic Propertiesmentioning

confidence: 99%

Peripheral halogenation engineering controls molecular stacking to enable highly efficient organic solar cells

Zou

Chen

et al. 2022

Energy Environ. Sci.

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Section: Photovoltaic Propertiesmentioning

confidence: 99%

Peripheral halogenation engineering controls molecular stacking to enable highly efficient organic solar cells

Zou

Chen

et al. 2022

Energy Environ. Sci.

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“…While PMHJ architecture has received increasing popularity with Y6 derivatives based material systems, [34][35][36][37][38][39][40][41] the highest performance of reported PMHJ OSCs is still barely over 18% PCE, [35,36] lagging behind the state-of-the-art BHJ ones which has the champion efficiency of 19%. An important consideration arises from the much less abundant D/A interfacial areas in PMHJ than those in BHJ, which strongly affects the exciton dissociation.…”

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confidence: 99%

Achieving 19% Power Conversion Efficiency in Planar‐Mixed Heterojunction Organic Solar Cells Using a Pseudosymmetric Electron Acceptor

et al. 2022

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flexibility, and tunable optical transparency, which are advantageous for applications in building-integrated photovoltaic (PV) and wearable electronics compared with conventional inorganic cells. [1][2][3][4][5] To achieve high efficiency, it is essential to develop suitable donor (D) and acceptor (A) materials that can be easily processed into a finely phase-separated morphology in active layer with low energy loss (E loss ) in OSCs. [6][7][8][9] Recently, the vibrant progress made on nonfullerene acceptors (NFAs), [10,11] especially the Y-series NFAs, [12] with facilely tailored chemical structures and precisely tuned bandgap, energy levels, and crystallization properties, has enabled OSCs to achieve very high power conversion efficiencies (PCEs) ≈19%. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] The bulk-heterojunction (BHJ) architecture-based devices prepared from mixing D and A in solution is the most widely adopted method for depositing photoactive layer and have successfully increased the PCE of single-junction OSCs to 19% recently. [31] Another emerging strategy is to deposit neat D and A materials A record power conversion efficiency (PCE) of over 19% is realized in planarmixed heterojunction (PMHJ) organic solar cells (OSCs) by adopting the asymmetric selenium substitution strategy in making a pseudosymmetric electron acceptor, BS3TSe-4F. The combined molecular asymmetry with more polarizable selenium substitution increases the dielectric constant of the D18/ BS3TSe-4F blend, helping lower the exciton binding energy. On the other hand, dimer packing in BS3TSe-4F is facilitated to enable free charge generation, helping more efficient exciton dissociation and lowering the radiative recombination loss (ΔE 2 ) of OSCs. As a result, PMHJ OSCs based on D18/BS3TSe-4F achieve a PCE of 18.48%. By incorporating another mid-bandgap acceptor Y6-O into D18/BS3TSe-4F to form a ternary PMHJ, a higher open-circuit voltage (V OC ) can be achieved to realize an impressive PCE of 19.03%. The findings of using pseudosymmetric electron acceptors in enhancing device efficiency provides an effective way to develop highly efficient acceptor materials for OSCs.

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“…While the recently developed D-A co-polymers might not share the same feature with P3HT in terms of the sharp absorption contrast upon solidification, the change of absorbance during film formation still provides valuable information regarding the rate and sequence of polymer aggregation. 25,[86][87][88] The absorption spectra during solution processing are usually measured by collecting the transmittance signal through the studied film. The geometry of the setup, however, varies in different labs.…”

Section: Absorption and Ellipsometrymentioning

confidence: 99%

Real-time views of morphological evolution in solution-processed organic photovoltaics

Liu¹,

Jin

et al. 2022

J. Mater. Chem. C

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In situandex situinvestigations on ternary strategy and co-solvent effects towards high-efficiency organic solar cells

Abstract: The morphology of organic solar cells (OSCs) is a core topic for reaching ultimate photovoltaic performance. Herein, we focused on the combination of two important morphology regulation strategies – ternary...

Cited by 91 publications

References 60 publications

Peripheral halogenation engineering controls molecular stacking to enable highly efficient organic solar cells

Peripheral halogenation engineering controls molecular stacking to enable highly efficient organic solar cells

Achieving 19% Power Conversion Efficiency in Planar‐Mixed Heterojunction Organic Solar Cells Using a Pseudosymmetric Electron Acceptor

Real-time views of morphological evolution in solution-processed organic photovoltaics

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