Exciton in organic photovoltaics

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Single photovoltaic material solar cells with enhanced exciton

Typical organic photovoltaic semiconductors exhibit high exciton binding energy (E b, typically >300 meV), hindering the development of organic solar cells based on a single photovoltaic material (SPM-OSCs).Herein, compared with the control molecule (Y6), Y6Se

Role of Exciton Diffusion and Lifetime in Organic Solar Cells with

Despite general agreement that the generation of free charges in organic solar cells is driven by an energetic offset, power conversion efficiencies have been improved using low-offset blends. In this work, we explore the interconnected roles that exciton diffusion and lifetime play in the charge generation process under various energetic offsets. A detailed

Excitons

Excitons are bound states formed between an electron and a hole in a semiconductor, playing a crucial role in the absorption and transport of light energy in organic photovoltaics. These quasi-particles arise when a photon excites an electron from its valence band to the conduction band, leaving behind a positively charged hole. The interaction between the negatively charged

Physical insights into non-fullerene organic photovoltaics

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

Optimizing Exciton Diffusion and Carrier Transport for Enhanced

2 天之前· Exciton diffusion and carrier transport are two critical factors that determine the efficiency of organic photovoltaics (OPVs). However, the relationship between these two

Triplet Excitons and Associated Efficiency-Limiting

Triplet states are a key efficiency-limiting factor in organic solar cells by opening a channel to non-radiative pathways. Complementary spin-sensitive methods unravel exciton pathways in blends empl...

Organic Photovoltaic Catalyst with Extended Exciton Diffusion for

The short exciton diffusion length (LD) associated with most classical organic photocatalysts (5–10 nm) imposes severe limits on photocatalytic hydrogen evolution efficiency. Here, a photovoltaic molecule (F1) without electron-deficient units at the central building block was designed and synthesized to improve the photoluminescence quantum yield (PLQY). With the

Intrinsic measurements of exciton transport in photovoltaic cells

Organic photovoltaic cells are partiuclarly sensitive to exciton harvesting and are thus, a useful platform for the characterization of exciton diffusion. While device photocurrent spectroscopy

Organic Solar Cells: An Introduction to Organic Photovoltaics

A concise overview of organic solar cells, also known as organic photovoltaics (OPVs), a 3rd-generation solar cell technology. OPVs are advantageous due to their affordability & low material toxicity. Their efficiencies are comparable to those of low-cost commercial silicon solar cells.

Exciton transport in molecular organic semiconductors

Designing molecular materials with very large exciton diffusion lengths would remove some of the intrinsic limitations of present-day organic optoelectronic devices. Yet, the nature of excitons in

Exciton Binding Energies in Organic Photovoltaic Materials: A

Typical organic photovoltaic semiconductors exhibit high exciton binding energy (Eb, typically >300 meV), hindering the development of organic solar cells based on a single photovoltaic material

Exciton diffusion in organic photovoltaic cells | Request PDF

For the process of photovoltaic conversion in organic solar cells (OSCs) and quantum‐dot solar cells (QDSCs), three of four steps are determined by exciton behavior, namely, exciton generation

Engineering ultrafast exciton dynamics to boost organic photovoltaic

State-of-the-art organic photovoltaic (OPV) devices are based on Y-type acceptors, with power conversion efficiencies now exceeding 20%. However, the basic structure–photophysics–performance relationship of these materials remains unclear, hindering rational material development and engineering. Here we investigat

Exciton diffusion in organic photovoltaic cells

Exciton generation, migration, and dissociation are key processes that play a central role in the design and operation of many organic optoelectronic devices. In organic photovoltaic cells, charge generation often occurs only at an interface, forcing the exciton to migrate from the point of photogeneration i

Suppressing electron-phonon coupling in organic photovoltaics

Reducing non-radiative energy loss is critical to improving power conversion efficiency in organic solar cells. Jiang et al. show that alkyl side-chain engineering in acceptors reduces the free

Exciton diffusion and dissociation in organic and quantum‐dot

Since exciton behavior plays a crucial role in photovoltaic conversion of OSCs and QDSCs, more efforts should be made to regulate it and then boost PCEs: (1) developing unified and reliable methods to measure the intrinsic L D and that in devices; (2) seekingJ

Polariton-assisted excitation energy channeling in organic

In organic heterojunction photovoltaic devices (OPVs), the formed excited states (excitons) must migrate to an interface, constituted by one electron donating and one electron accepting material

Charge-transfer electronic states in organic solar cells

Jailaubekov, A. E. et al. Hot charge-transfer excitons set the time limit for charge separation at donor/acceptor interfaces in organic photovoltaics. Nat. Mater. 12, 66–73 (2013).

Journal of Materials Chemistry A

Long-range exciton diﬀusion in non-fullerene acceptors and coarse bulk heterojunctions enable highly eﬃcient organic photovoltaics† Muhammad T. Sajjad, *ab Arvydas Ruseckas, a Lethy Krishnan Jagadamma,a Yiwei Zhanga and Ifor D. W. Samuel *a

Engineering ultrafast exciton dynamics to boost organic

State-of-the-art organic photovoltaic (OPV) devices are based on Y-type acceptors, with power conversion efficiencies now exceeding 20%. However, the basic

Enhancing Exciton Diffusion Length Provides New Opportunities

Organic semiconductors can potentially revolutionize solar cell technology by offering very thin, lightweight, and flexible modules for outdoor and indoor power generation. Light absorption in organic semiconductors generates a bound electron-hole pair (exciton), which needs to travel to the interface between electron donor and acceptor materials to dissociate into

Organic Photovoltaic Catalyst with Extended Exciton Diffusion for

The short exciton diffusion length (LD) associated with most classical organic photocatalysts (5–10 nm) imposes severe limits on photocatalytic hydrogen evolution

Multiple-Time Scale Exciton Dynamics in Organic Photovoltaic

Organic photovoltaics (OPVs) are regarded as one of the most promising candidates for various outdoor and indoor application scenarios. The development and application of nonfullerene acceptors have pushed power conversion efficiencies (PCEs) of single-junction cells to exceed 19%, and values approaching 20% are within sight. This progress has resulted

Role of Exciton Diffusion and Lifetime in Organic Solar Cells with

These results also clearly reveal and elucidate the relationship between photo-generation and recombination in excitonic semiconductor photovoltaics thus providing an

Circumventing the Tradeoff between Optical Absorption and Exciton

In organic photovoltaic cells, charge generation often occurs only at an interface, forcing the exciton to migrate from the point of photogeneration in order to be dissociated into its constituent

Voltage-dependent excitation dynamics in UV-absorbing organic

Intermolecular charge-transfer excitons play a central role in determining the performance of organic solar cells as their voltage-dependent formation, dissociation, and recombination dynamics contribute to photocurrent generation, radiative/nonradiative voltage losses, and photovoltaic fill factor. Here, we

Exciton blocking layers in organic photovoltaic devices

Exciton blocking layers are essential for efficient organic photovoltaic device operation, where they serve to block excitons at the anode or cathode contact in order to reduce losses in the cells

Exciton Management in Organic Photovoltaic Multidonor Energy Cascades

Multilayer donor regions in organic photovoltaics show improved power conversion efficiency when arranged in decreasing exciton energy order from the anode to the acceptor interface. These so-called "energy cascades" drive exciton transfer from the anode to the dissociating interface while reducing exciton quenching and allowing improved overlap with the

Long-range exciton diffusion in molecular non-fullerene acceptors

The short exciton diffusion length associated with most classical organic semiconductors used in organic photovoltaics (5-20 nm) imposes severe limits on the maximum size of the donor and acceptor

Free charge photogeneration in a single component high

Abstract. Organic photovoltaics (OPVs) promise cheap and flexible solar energy. Whereas light generates free charges in silicon photovoltaics, excitons are normally formed in

Enhancing Exciton Diffusion Length Provides New Opportunities

Perspective Enhancing Exciton Diffusion Length Provides New Opportunities for Organic Photovoltaics Muhammad T. Sajjad, 1,2 * Arvydas Ruseckas, and Ifor D.W. Samuel1,* Organic semiconductors can potentially revolutionize solar cell technology by offering very

Exciton binding energies and polaron interplay in the optically

1 Introduction Organic–inorganic lead halide perovskites (OILHPs) are characterized by the general chemical expression of APbX 3, where A represents cation groups such as

External Quantum Efficiency Above 100% in a Singlet-Exciton

Singlet exciton fission is a type of multiple exciton generation mechanism found in organic semiconductors (3, 4). It is notable because spin conservation disallows the usual competing loss process: thermal relaxation of the high-energy exciton into a