Achieving finely tuned phase separation and vertical distribution within the photoactive layer is crucial for enhancing charge transport, thereby significantly influencing the photovoltaic performance of organic solar cells (OSCs).
Based on the difference in the surface tension between a donor and an acceptor (Y6), an appropriate morphology with nanoscale phase separation was achieved in the blend system by regulating the intermolecular compatibility, thus effectively enhancing the photovoltaic performance of the corresponding ASM-OSCs.
Halide ion phase separation is a widely recognized problem for the application of mixed-halide perovskites in solar cells and LEDs whereby the presence of large populations of photogenerated or injected carriers cause undesirable and time-dependent red shifting of the absorption edge and emission wavelengths.
It was hypothesized that the phase separation mechanism involves a self-reinforcing demixing of Br − and I − ions driven by reducing the potential energies of photogenerated carriers that are trapped in regions of smaller band gap. organic perovskites; however, inconsistences exist in the reported spectral and microstructural evolution.
To induce phase separation, the electron beam is blanked, and the sample is illuminated with a 450 nm diode laser at 6.37 mW/mm 2 at 173 K. Then, the laser is turned off, and the CL map is collected. After 5 min of illumination, the center of the CL spectrum redshifts to 1.94 eV (640 nm), indicating phase separation.
After 25 min, the phase separation produces a saturated, red-shifted emission at 1.74 eV (716 nm), indicating that the composition of the iodide-rich regions in the film is no longer changing with illumination time.
Efficient small molecular ternary solar cells by synergistically ...
Recently, power conversion efficiency (PCE) of organic solar cells has been increased up to about 10% by using solvent additives or mixed solutions to elaborately adjust phase separation which is a great challenge for large scale production. We report a champion PCE of 7.40% for solution-processed small mole
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Phase separation and domain crystallinity control enable open‐air ...
Improved phase separation and domain crystallinity positively impact charge transport and extraction in OSCs. This is evidenced by the enhanced charge carrier mobility and reduced lifetime of the transient photocurrent (TPC). To further optimize the OSCs, a combination of solvent vapor annealing (SVA) and thermal annealing (TA) was employed ...
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Cold Crystallization Temperature Correlated Phase Separation ...
Differential scanning calorimetry detection of cold crystallization temperature (TCC) was applied to depict the crystallizing complexity of non-fullerene acceptor and quenched depth in polymer solar cells. Correlating TCC with X-ray scattering information, power conversion efficiency, and thermal stability evolution, the morphology, performance, and stability are …
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Kinetics and mechanism of light-induced phase …
Halide ion phase separation is a widely recognized problem for the application of mixed-halide perovskites in solar cells and LEDs whereby the presence of large populations of photogenerated or injected carriers cause undesirable and time …
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Regulating phase separation and molecular stacking by …
Based on the difference in the surface tension between a donor and an acceptor (Y6), an appropriate morphology with nanoscale phase separation was achieved in the blend system by regulating the intermolecular …
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Suppressing the phase separation in FAMA mixed perovskite solar …
Suppressing the phase separation via preloading the A-site cations in the perovskite lattice enhances the intrinsic ambient air-stability of FAMA mixed perovskite by over …
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Synergistic control of multilength-scale morphology and vertical phase …
Controlling the morphology of organic solar cells (OSCs) presents a significant challenge due to their complex structure and composition. In particular, attaining synergistic control over the multi-length-scale morphology and vertical phase separation poses a substantial obstacle to the advancement of OSC te
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Vertically optimized phase separation with improved exciton …
Exciton diffusion length and graded vertical phase separation of the active layer play a critical role in the realization of high-performance thick-film organic solar cells (OSCs). Here,...
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Vertical phase separation in bulk heterojunction solar cells formed …
Vertical phase separation of the donor and the acceptor in organic bulk heterojunction solar cells is crucial to improve the exciton dissociation and charge transport efficiencies. This is...
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Precise Control of Phase Separation Enables 12
The results demonstrate that precise control of phase separation can be achieved by fine-tuning the molecular structure and film formation conditions, improving PCE and providing guidance for morphology design.
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Regulating phase separation and molecular stacking by …
Based on the difference in the surface tension between a donor and an acceptor (Y6), an appropriate morphology with nanoscale phase separation was achieved in the blend system by regulating the intermolecular compatibility, thus effectively enhancing the photovoltaic performance of the corresponding ASM-OSCs.
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Thermal-Driven Phase Separation of Double
Thermal-Driven Phase Separation of Double-Cable Polymers Enables Efficient Single- Component Organic Solar Cells A double-cable conjugated polymer containing a crystalline backbone as the donor and perylene bisimide side units as the acceptor was developed as a single photoactive layer for organic solar cells. When the polymer thin film was annealed at …
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All-polymer organic solar cells with nano-to-micron ...
Here, authors report sequential-processed all-polymer solar cells with nano-sized phase separation integrated in micro-sized surface topology and maximum efficiency of over 19%.
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Kinetics and mechanism of light-induced phase separation in a …
Halide ion phase separation is a barrier to the application of mixed-halide perovskites whereby the presence of large populations of photogenerated or injected carriers causes undesirable changes in the local band gap. We investigate the mechanism of phase separation in CsPbI x Br 3-x perovskite single crystals driven by light.
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Vertical phase separation in bulk heterojunction solar cells formed …
Vertical phase separation of the donor and the acceptor in organic bulk heterojunction solar cells is crucial to improve the exciton dissociation and charge transport …
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Regulating the phase separation of ternary organic solar cells via …
The phase separation of a binary J71:ITIC blend has been effectively modified by incorporating a 3D Tetraphenylethylene (TPE) molecule. The Flory-Huggins parameter (χ) and vertical phase distribution analysis reveals that TPE settles in between J71:ITIC and forces the ITIC away from J71 in the mixed phase, indicating relatively higher average acceptor domain …
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Synergistic control of multilength-scale morphology …
Controlling the morphology of organic solar cells (OSCs) presents a significant challenge due to their complex structure and composition. In particular, attaining synergistic control over the multi-length-scale …
Learn More
Kinetics and mechanism of light-induced phase …
Halide ion phase separation is a barrier to the application of mixed-halide perovskites whereby the presence of large populations of photogenerated or injected carriers causes undesirable changes in the local band gap. We …
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EFFECT OF PHASE SEPARATION ON PERFORMANCE OF III-V NITRIDE SOLAR CELLS
Phase separation of material in solar cells not only tends to reduce the short circuit current by forming low band gap recombination centers, but also tends to pin down the open circuit voltage. Phase separation is controlled during MOCVD epitaxial growth by increasing the indium carrier gas flow rate, increasing the growth rate and limiting ...
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Optimizing Phase Separation and Vertical Distribution via …
Achieving finely tuned phase separation and vertical distribution within the photoactive layer is crucial for enhancing charge transport, thereby significantly influencing the photovoltaic performance of organic solar cells (OSCs). In this study, a nonfullerene acceptor, denoted as HLG, is designed and synthesized by introducing hydrophobic 1,2 ...
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Simultaneously Optimizing Molecular Stacking and Phase Separation …
Simultaneously Optimizing Molecular Stacking and Phase Separation via Solvent-Solid Hybrid Additives Enables Organic Solar Cells with over 19% Efficiency † Haicui Liu, Haicui Liu
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