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Dielectric constant ( ε) is an important parameter affecting the power conversion efficiency of organic solar cells (OSC).
The fill factor (FF) of organic solar cells (OSCs), a critically important photovoltaic parameter, is still sub-optimal, often less than 0.8. To further reduce the FF gaps with regard to the Shockley-Queisser upper limit, we present a study unveiling the impacts of dielectric properties on obtaining high FFs and photovoltaic efficiencies in OSCs.
The real part of the dielectric constant can be divided into three regions (Fig. 1c): a low-frequency region (<1 Hz, marked as A), a moderate-frequency region (1–10 4 Hz, marked as B), and a high-frequency region (>10 4 Hz, marked as C).
Here, we demonstrate that the defect capturing probability estimated by the capture cross-section is decreased by varying the dielectric response, producing the dielectric screening effect in the perovskite. The resulting perovskites also show reduced surface recombination and a weaker electron-phonon coupling.
Changes in the localized electric fields by the variation in the dielectric constant will lead to defect screening, which can mitigate the adverse effects of pristine unoccupied defects in the films.
Based on this investigation, we deem that increasing the charge collection efficiency and reducing the dependence of PC on E are highly favorable for increasing FF, which is afforded by the enlargement of the dielectric constant with appropriate phase separation in the blends to suppress charge recombination loss. 37,38
In this review, we overview the current understandings on dielectric constant and its impacts on exciton dissociation and voltage losses in OSCs and summarize recent …
Measurement of saturation capacitance indicates that the relative dielectric constant is ∼18. ... BTP-OE offers consistently lower device performance relative to Y6-BO in …
The tunability and the possibility of control of the real part of the dielectric constant (relative dielectric constant) are known as key factors for superior photovoltaic …
The majority of organic semiconductors have a low relative dielectric constant (εr < 6), which is an important limitation for organic solar cells (OSCs). A high dielectric constant would reduce ...
The PCE statistics obtained from 20 solar cell devices with different contents of the PA additive and NOBF 4 dopant are depicted in Fig. 4 b and Fig. 4 c, respectively. As can …
We report on measurement of dielectric constant, mid-gap defect density, Urbach energy of tail states in CH 3 NH 3 PbI x Cl 1−x perovskite solar cells. Midgap defect densities were estimated by measuring capacitance …
Formamidinium lead triiodide (FAPbI 3) perovskite solar cells (PSCs) with a certified 25.5% power conversion efficiency (PCE) are the most promising devices for next …
The potential of CsGeI 3 as a solar cell material is assessed based on its intrinsic properties. We find anomalously large Born effective charges and a large static dielectric constant dominated by lattice polarization, which should reduce …
Increasing the relative dielectric constant is a constant pursuit of organic semiconductors, but it often leads to multiple changes in device characteristics, hindering the …
By increasing the dielectric constant (ε) of non-fullerene acceptors (NFAs) and bulk heterojunction (BHJ) films, afforded by the increase in molecular packing density (MPD) …
We also checked the effects of SOC on the dielectric constant at the DFT level using a finite electric field approach within DFT 34,33 and a 2 × 2 × 2 k-points grid, obtaining a …
In general, the relative permittivity ε r (ω) of a material, also known as dielectric constant, depends on frequency ω or, equivalently, on photon energy. It describes how the …
Hybrid organic-inorganic perovskites are promising materials for the application in solar cells and light-emitting diodes. ... the apparent dielectric constant is of paramount …
In this review, we overview the current understandings on dielectric constant and its impacts on exciton dissociation and voltage losses in OSCs and summarize recent efforts attempting to modify the dielectric …
When the heterojunction partner has a high permittivity, solar cells are consistently more robust against several non-idealities that are especially likely to occur in early-stage development, …
When the heterojunction partner has a high permittivity, solar cells are consistently more robust against several non-idealities that are especially likely to occur in early-stage development, …
The potential of CsGeI 3 as a solar cell material is assessed based on its intrinsic properties. We find anomalously large Born effective charges and a large static dielectric constant dominated …
dielectric constant of an organic semiconductor is reported, it is most often determined using impedance spectroscopy. However, within the scarcity of dielectric constant values in OPV …
We report on measurement of dielectric constant, mid-gap defect density, Urbach energy of tail states in CH 3 NH 3 PbI x Cl 1−x perovskite solar cells. Midgap defect …