Multi‐Selenophene‐Containing Narrow Bandgap Polymer Acceptors for All‐Polymer Solar Cells with over 15 % Efficiency and High Reproducibility

Angewandte Chemie International Edition, Год журнала: 2021, Номер 60(29), С. 15935 - 15943

Опубликована: Май 3, 2021

Abstract All‐polymer solar cells (all‐PSCs) progressed tremendously due to recent advances in polymerized small molecule acceptors (PSMAs), and their power conversion efficiencies (PCEs) have exceeded 15 %. However, the practical applications of all‐PSCs are still restricted by a lack PSMAs with broad absorption, high electron mobility, low energy loss, good batch‐to‐batch reproducibility. A multi‐selenophene‐containing PSMA, PFY‐3Se, was developed based on selenophene‐fused SMA framework selenophene π‐spacer. Compared its thiophene analogue PFY‐0Se, PFY‐3Se shows ≈30 nm red‐shifted increased improved intermolecular interaction. In all‐PSCs, achieved an impressive PCE 15.1 % both short‐circuit current density 23.6 mA cm −2 fill factor 0.737, which among best values reported date much better than PFY‐0Se (PCE=13.0 %). Notably, maintains similarly properties for realizing reproducible device performance, is first also very rare PSMAs. Moreover, PFY‐3Se‐based show dependence area (0.045–1.0 2 ) active layer thickness (110–250 nm), indicating great potential toward applications.

Язык: Английский

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Non-fullerene acceptors with hetero-dihalogenated terminals induce significant difference in single crystallography and enable binary organic solar cells with 17.5% efficiency

Energy & Environmental Science, Год журнала: 2021, Номер 15(1), С. 320 - 333

Опубликована: Окт. 6, 2021

A synergistic hetero-dihalogenated terminals strategy was systematically employed for the first time to enhance single-crystal packing, boosting device performance of a Y-BO-FCl:PM6 with remarkable PCE 17.52%.

Язык: Английский

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Design of Near‐Infrared Nonfullerene Acceptor with Ultralow Nonradiative Voltage Loss for High‐Performance Semitransparent Ternary Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2021, Номер 61(19)

Опубликована: Дек. 28, 2021

Semitransparent organic solar cells (ST-OSCs) are considered as one of the most valuable applications OSCs and a strong contender in market. However, optical band gap current high-performance ST-OSCs is still not low enough to achieve optimal balance between power conversion efficiency (PCE) average visible transmittance (AVT). An N-substituted asymmetric nonfullerene acceptor SN with over 40 nm bathochromically shifted absorption compared Y6 was designed synthesized, based on which device PM6 donor obtained PCE 14.3 %, accompanied nonradiative voltage loss 0.15 eV. Meanwhile, ternary devices addition into : can 17.5 % an unchanged open-circuit improved short-circuit current. Benefiting from extended NIR lowered loss, were fabricated optimized demonstrated 14.0 at AVT 20.2 highest 20 %.

Язык: Английский

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Lowing the energy loss of organic solar cells by molecular packing engineering via multiple molecular conjugation extension

Science China Chemistry, Год журнала: 2022, Номер 65(7), С. 1362 - 1373

Опубликована: Май 6, 2022

Язык: Английский

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Flexible-spacer incorporated polymer donors enable superior blend miscibility for high-performance and mechanically-robust polymer solar cells

Energy & Environmental Science, Год журнала: 2021, Номер 14(7), С. 4067 - 4076

Опубликована: Янв. 1, 2021

We develop an effective strategy to obtain polymer solar cells with high power conversion efficiency (17%) and remarkable mechanical robustness, by design of donors aliphatic flexible spacer incorporated into a rigid backbone.

Язык: Английский

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An Electron Acceptor Analogue for Lowering Trap Density in Organic Solar Cells

Advanced Materials, Год журнала: 2021, Номер 33(14)

Опубликована: Март 3, 2021

Typical organic semiconductor materials exhibit a high trap density of states, ranging from 1016 to 1018 cm-3 , which is one the important factors in limiting improvement power conversion efficiencies (PCEs) solar cells (OSCs). In order reduce within OSCs, new strategy design and synthesize an electron acceptor analogue, BTPR, developed, introduced into OSCs as third component enhance molecular packing with without blending polymer donor. Finally, as-cast ternary OSC devices employing BTPR show notable PCE 17.8%, low (1015 ) energy loss (0.217 eV) caused by non-radiative recombination. This among highest values for single-junction OSCs. The additives, 1015 comparable even lower than those several typical high-performance inorganic/hybrid counterparts, like amorphous silicon, metal oxides, 1014 halide perovskite thin film, makes it promising obtain up 20%.

Язык: Английский

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A Difluoro‐Monobromo End Group Enables High‐Performance Polymer Acceptor and Efficient All‐Polymer Solar Cells Processable with Green Solvent under Ambient Condition

Advanced Functional Materials, Год журнала: 2021, Номер 31(25)

Опубликована: Май 2, 2021

Abstract In this paper, a difluoro‐monobromo end group is designed and synthesized, which then used to construct novel polymer acceptor (named PY2F‐T) yielding high‐performance all‐polymer solar cells with 15.22% efficiency. The fluorination strategy can increase the intramolecular charge transfer interchain packing of previous PY‐T based acceptor, significantly improve photon harvesting mobility resulting acceptor. addition, detailed morphology investigations reveal that PY2F‐T‐based blend shows smaller domain spacing higher purity, suppress recombination as supported by time‐resolved techniques. These properties enable simultaneously enhanced J SC FF devices, eventually delivering device efficiencies over 15%, outperforming devices on non‐fluorinated (13%). More importantly, active layers be processed under ambient conditions still achieve 14.37% They also using non‐halogenated solvent o ‐xylene (no additive) yield decent performance 13.05%. This work demonstrates success in design acceptors, provide guidelines for developing new all‐PSCs better stabilities commercial applications.

Язык: Английский

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Solvent Annealing Enables 15.39% Efficiency All‐Small‐Molecule Solar Cells through Improved Molecule Interconnection and Reduced Non‐Radiative Loss

Advanced Energy Materials, Год журнала: 2021, Номер 11(22)

Опубликована: Апрель 25, 2021

Abstract Post‐treatment is of great importance to form nanoscale phase‐separated morphology for all‐small‐molecule organic solar cells (ASM‐OSCs), while the reasons difference between thermal annealing (TA) and solvent (SVA) remain unclear. In this work, influences TA SVA (with three common solvents THF, CS 2 , CF) are systematically investigated based on BT‐2F:N3 through characterization photovoltaic performance, molecular stacking, charge transfer, etc. The results indicate that: i) with good solubility induce stronger interaction than that treatment, thus endowing molecules better mobility migrate crystallization phase separation, which leads J ‐aggregation interconnection. ii) Donor‐selectively dissolved optimizing donor domain its suitable size, improved interconnection, reduced trap states. iii) imposes a small impact N3 acceptors alleviates increment non‐radiative recombination. As result, unique multifunctions enables PCE 15.39% simultaneously voltage (0.845 V) fill factor (75.02%), much higher 14.66% treatment. Moreover, efficiency also highest value in binary ASM‐OSCs.

Язык: Английский

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Semitransparent Organic Solar Cells with Efficiency Surpassing 15%

Advanced Energy Materials, Год журнала: 2022, Номер 12(20)

Опубликована: Апрель 10, 2022

Abstract Semitransparent organic solar cells (ST‐OSCs) have promising prospects for building or vehicle integrated energy harvesting with generation and see‐through function. How to achieve both an adequate average visible transmittance (AVT) high‐power conversion efficiency (PCE) is always the key issue. Herein, a simple but effective strategy constructing high performance ST‐OSCs by introducing small molecule [2‐(9‐H‐Carbazol‐9‐yl) ethyl] phosphonic acid (2PACz) into low‐donor content active layer reported. The fill factor improved from 70.5% 75.5% correlated mitigated charge recombination strengthened extraction, further ascribed enhanced build‐in potential, reduced transport resistance, favorable film morphology. By combining unique nature of 2PACz, that can spontaneously form in situ self‐organized hole interlayers under bulk‐heterojunction films, PEDOT‐free PCE 15.2%, amongst highest values this field, achieved AVT 19.2%. Moreover, outstanding light utilization 3.39% also obtained 30.0% 11.3% translucent device tuning electrode. work demonstrates new achieving excellent simplified structure.

Язык: Английский

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Regioisomer‐Free Difluoro‐Monochloro Terminal‐based Hexa‐Halogenated Acceptor with Optimized Crystal Packing for Efficient Binary Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(46)

Опубликована: Сен. 2, 2022

Herein, we synthesized new hetero-halogenated end groups with well-determined fluorinated and chlorinated substitutions (o-FCl-IC FClF-IC), regioisomer-free small molecular acceptors (SMAs) Y-Cl, Y-FCl, Y-FClF distinct terminals, respectively. The single-crystal structures theoretical calculations indicate that exhibits more compact three-dimensional network packing significant π-π electronic coupling compared to Y-FCl. From Y-Cl Y-FCl Y-FClF, the neat films exhibit a narrower optical band gap gradually enhanced electron mobility crystallinity. PM6 : blend film strongest crystallinity preferential face-on packing, desirable fibrous morphology suitable phase segregation, highest balanced charge mobilities among three films. Overall, organic solar cells (OSCs) deliver remarkable efficiency of 17.65 %, outperforming which is best PCE for reported hetero-halogens-based SMAs in binary OSCs. Our results demonstrate difluoro-monochloro hetero-terminal superior regio-regular unit enhancing intermolecular crystal photovoltaic performance SMAs.

Язык: Английский

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