Bimolecular recombination in organic photovoltaics

The nanoscale morphology and high charge densities in organic photovoltaics (OPVs) lead to a high rate of bimolecular encounters between spin-uncorrelated electrons and holes. This process can lead to the formation of low-energy triplet excitons on the donor polymer that decay nonradiatively
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Bimolecular and Trap-Assisted Recombination in Organic Bulk

Request PDF | On Apr 11, 2014, Gert-Jan A.H. Wetzelaer and others published Bimolecular and Trap-Assisted Recombination in Organic Bulk Heterojunction Solar Cells | Find, read and cite all the

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Quantitative bimolecular recombination in organic photovoltaics

Feb 21, 2014· Figure 1. (Left) Schematic of bimolecular recombination processes of free charge carriers (FC) in OPV (not to energy scale). Encounters of spin-uncorrelated charges at D−A interface form charge-transfer states with both singlet (1CT) and triplet (3CT) spin characteristics. These CT states could either reionize into FC or recombine terminally across the interface.

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High Thickness Tolerance in All‐Polymer‐Based Organic Photovoltaics

Sep 20, 2024· Abstract Organic photovoltaics (OPVs) have great potential to drive low-power consumption electronic devices under indoor light due to their highly tunable optoelectronic properties. leading to reduced bimolecular recombination losses in thick devices. The unbalanced charge carrier mobilities are identified as the main cause for significant

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Highly efficient organic solar cells enabled by suppressing triplet

Oct 15, 2024· The high non-radiative energy loss is a bottleneck issue that impedes the improvement of organic solar cells. The formation of triplet exciton is thought to be the main source of the large non

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Charge Dynamics and Defect States under "Spot‐Light":

1 day ago· Bimolecular recombination of free carriers is typically associated with radiative recombination, a band-to-band process. The increased emissivity of the AT-containing films

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Competition between recombination and extraction of free

May 7, 2015· Organic photovoltaic devices (OPVs) represent a highly attractive choice for harnessing solar energy in terms of low cost, easiness of production, flexibility and environmental sustainability.

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How to Reduce Charge Recombination in Organic

Illustration of the relevant energy levels and transitions for charge generation and recombination in organic bulk-heterojunction solar cells. The nongeminate recombination of electrons and holes from the charge separated (CS) state to

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Why is bimolecular recombination important in organic solar cells?

In organic solar cells, bimolecular recombination is a key factor limiting the device performance and creating the need for characterization. Light-intensity-dependent short-circuit current density measurements are a frequently used tool to qualitatively analyze bimolecular recombination in a device.

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Reducing nonradiative recombination for highly

Jul 4, 2024· Reducing interface nonradiative recombination is important for realizing highly efficient perovskite solar cells. In this work, we develop a synergistic bimolecular interlayer (SBI) strategy via 4

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Charge carrier recombination in organic solar cells

Dec 1, 2013· As shown in Fig. 1, nongeminate recombination includes the recombination of a free electron and a free hole known as bimolecular recombination (Fig. 1 b) and trap-assisted recombination Recombination in organic solar cells has been found to possess similar dependencies [189]. Thus it is clear that higher reaction orders at least in part

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Organic solar cells with near-unity charge generation yield

The subtle link between photogenerated charge generation yield (CGY) and bimolecular recombination in organic semiconductor-based photovoltaics is relatively well established as a concept but has proven extremely challenging to demonstrate and probe especially under operational conditions. Received wisdom al Recent Open Access Articles

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Does bimolecular recombination exist in bulk heterojunction organic photovoltaic devices?

We review scientific literature on bimolecular recombination (BR) in bulk heterojunction organic photovoltaic devices to bring forward existing ideas on the origin and nature of BR and highlight both experimental and theoretical work done to quantify its extent.

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Bimolecular Recombination in Organic Photovoltaics

We review scientific literature on bimolecular recombination (BR) in bulk heterojunction organic photovoltaic devices to bring forward existing ideas on the origin and nature of BR and highlight both experimental and theoretical work done to quantify its extent.

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Understanding the Light‐Intensity Dependence of the

Aug 18, 2020· In organic solar cells, bimolecular recombination is a key factor limiting the device performance and creating the need for characterization. Light-intensity-dependent short-circuit current density measurements are a frequently used tool to qualitatively analyze bimolecular recombination in a device.

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Physical insights into non-fullerene organic photovoltaics

Apr 15, 2024· This Review highlights the photophysics and device physics of non-fullerene organic photovoltaics, including exciton generation, diffusion, transport, separation and charge

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Are solar cells based on non-fullerene acceptors bimolecular recombination?

However, the bimolecular recombination rate in solar cells based on novel non-fullerene acceptors is mostly unclear. Moreover, the origin of the reduced-Langevin recombination rate in bulk heterojunction solar cells in general is still poorly understood.

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Charge Transport and Recombination in Organic Solar Cells

Nov 26, 2014· 2.2.6.1 Geminate Recombination. Organic solar cells combine both p-type and n-type semiconductors with the p-type material showing higher electron affinity and ionization N. J., Koster, L. J. A. & Blom, P. W. M. Quantifying Bimolecular Recombination in Organic Solar Cells in Steady State. Advanced Energy Materials 3, 1130–1134, doi:10.

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The role of charge recombination to triplet excitons in organic solar cells

Sep 29, 2021· However, it has been reported that the bimolecular recombination rates of efficient NFA organic solar cells are much less than the Langevin rate 41,42. In our transient absorption measurements, we

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Which recombination mechanism is dominant in organic solar cells?

Bimolecular recombination is often assumed to be the dominant recombination mechanism in organic solar cells. [50 - 52] This process occurs nonradiatively where a free electron and a free hole recombine with each other.

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The role of charge recombination to triplet excitons in organic

Sep 29, 2021· Here we show that in most organic solar cells that use NFAs, the majority of charge recombination under open-circuit conditions proceeds via the formation of non

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Light intensity dependence of organic solar cell operation and

Aug 18, 2021· We investigated the variation of current density–voltage (J–V) characteristics of an organic solar cell (OSC) in the dark and at 9 different light intensities ranging from 0.01 to 1 sun of the

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Insights into charge dynamics and recombination processes in

Insights into charge dynamics and recombination processes in ternary organic solar cells through photophysical characterization techniques. Author links open overlay panel Maria Méndez 1, José G. Sánchez 1, When the S value is close to 1, it suggests a

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Understanding the Light‐Intensity Dependence of the

Aug 18, 2020· In organic solar cells, bimolecular recombination is a key factor limiting the device performance and creating the need for characterization. Light-intensity-dependent short-circuit current density measurements are a

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Why is bimolecular recombination limited in OPV?

In a disordered semiconductor with localized charge carriers, bimolecular recombination is limited by the rate at which oppositely charged carriers find one another. The faster charge carriers move, the faster they will find each other; consequently, the rate of bimolecular recombination in OPV is proportional to the charge carrier mobilities.

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Molecular Control of the Donor/Acceptor

Single-component organic solar cells based on double cable polymers have achieved remarkable performance, with DCPY2 reaching a high efficiency of over 13%. In this study, DCPY2 is further optimized with an efficiency of 13.85%, maintaining a high fill factor (FF) without compromising the short circuit current. Bimolecular recombination

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Does spin control recombination in organic photovoltaics?

Rao, A. et al. The role of spin in the kinetic control of recombination in organic photovoltaics. Nature 500, 435–439 (2013). Gillett, A. J. et al. The role of charge recombination to triplet excitons in organic solar cells.

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Trap‐Assisted Charge Generation and Recombination in

Wetzelaer et al. presented an elegant steady-state method to probe bimolecular recombination in organic solar cells at high forward bias. By comparing current densities in a blend in hole-only, electron-only, and double-carrier diodes, charge recombination can be calculated for every voltage and temperature.

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Reduced bimolecular charge recombination in efficient organic

While bimolecular recombination in low-mobility semiconductors closely follows the Langevin mechanism 26, 27, being based on the diffusion of oppositely charged carriers toward each other in their mutual Coulomb field, the bimolecular recombination rate in efficient organic bulk-heterojunction solar cells can be orders of magnitude lower than

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Quantitative Bimolecular Recombination in Organic Photovoltaics

Feb 12, 2014· The nanoscale morphology and high charge densities in organic photovoltaics (OPVs) lead to a high rate of bimolecular encounters between spin-uncorrelated electrons and holes.

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Reduced bimolecular charge recombination in efficient organic

Mar 22, 2023· Here, we investigate the bimolecular recombination rate and charge transport in a series of high-performance organic solar cells based on non-fullerene acceptors.

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Impact of Active Layer Morphology on Bimolecular

Oct 19, 2017· Using kinetic Monte Carlo simulations, we present a reaction-diffusion model to describe the impact of the morphology of the active layer and charge-transfer lifetime on the

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Charge carrier recombination in organic solar cells

Dec 1, 2013· In this review article on recombination mechanisms in organic solar cells we will present the theory and experimental evidence for the various recombination processes

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Bimolecular Recombination

2.5.3.4.2 Recombination mechanisms in organic photovoltaics. There are two major types of recombination in organic solar cells [22]. They include geminate pair recombination and bimolecular recombination. Recall that the active layer is composed of an interwoven network of donor and acceptor atoms.

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Reduced bimolecular charge recombination in efficient organic

Mar 22, 2023· Bimolecular charge recombination is one of the most important loss processes in organic solar cells. However, the bimolecular recombination rate in solar cells based on novel non-fullerene

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Bimolecular Recombination in Organic Photovoltaics

Jan 9, 2014· Here, we investigate the bimolecular recombination rate and charge transport in a series of high-performance organic solar cells based on non-fullerene acceptors.

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Quantifying Bimolecular Recombination in Organic Solar Cells in

May 17, 2013· A steady-state method to probe bimolecular recombination in organic solar cells is presented. The technique is applicable to thin-film solar cells at any temperature and does not require a separate measurement setup other than conventional solar-cell testing equipment.

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Bimolecular and Trap‐Assisted Recombination in Organic Bulk

Recombination at Open Circuit. Trap-Assisted Recombination at Open Circuit. Investigation of the Nature Recombination by Electroluminescence Measurements. Bimolecular Recombination Strength in Organic BHJ Solar Cells. Bimolecular Recombination Losses Under Short-Circuit Conditions. Effect of Bimolecular Recombination on Fill Factor and

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Non-fullerene acceptor with asymmetric structure and phenyl

Jun 12, 2024· For organic solar cells (OSCs), bridging the gap with Shockley–Queisser limit necessitates simultaneously reducing the energy loss for a high open-circuit voltage, improving light utilization

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Ternary Organic Solar Cells—Simulation–Optimization Approach

Feb 14, 2024· Organic solar cells are a rapidly expanding subfield of photovoltaics. The publication presents simulation results for organic cells with a focus on optimizing cells and maximizing performance using OghmaNano software. The efficiencies obtained from the simulation of the ternary solar devices were received. The efficiency achieved from simulations

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Quantifying Bimolecular Recombination in Organic Solar Cells in

Sep 1, 2013· Request PDF | Quantifying Bimolecular Recombination in Organic Solar Cells in Steady State | Organic solar cells have shown rapid performance increase in recent years. For the development of new

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Optical and electrical losses in semitransparent organic photovoltaics

Feb 21, 2024· The light intensity dependence of J SC follows the relationship J SC ∝ P α, in which α < 1 indicates some extent of bimolecular recombination and α = 1 means no bimolecular recombination. 45 Slight decreases in α values are observed when applying Ag mirror to the STOPVs (Figure 3 C), suggesting that more bimolecular recombination is

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About Bimolecular recombination in organic photovoltaics

About Bimolecular recombination in organic photovoltaics

The nanoscale morphology and high charge densities in organic photovoltaics (OPVs) lead to a high rate of bimolecular encounters between spin-uncorrelated electrons and holes. This process can lead to the formation of low-energy triplet excitons on the donor polymer that decay nonradiatively and limit the device performance.

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