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Recent efforts in materials and device architecture optimization have pushed the power conversion efficiency of bulk heterojunction organic solar cells (BHJ OSCs) well beyond 10% 1,2,3.All of ...
Recent efforts in materials and device architecture optimization have pushed the power conversion efficiency of bulk heterojunction organic solar cells (BHJ OSCs) well beyond 10% 1,2,3.All of ...
Understanding Energy Loss in Organic Solar Cells: Toward a New Efficiency Regime S. Matthew Menke,1,* Niva A. Ran,2 Guillermo C. Bazan,2 and Richard H. Friend1 Reducing energy and voltage loss is an imperative area of improvement for the design of organic solar cells (OSCs). Both in the context of charge generation
Influence of blend morphology and energetics on charge separation and recombination dynamics in organic solar cells incorporating a nonfullerene acceptor
A substantial pathway for energy loss in organic solar cells may be suppressed by engineering hybridization between non-fullerene acceptor triplet excitons and spin-triplet …
Organic solar cells benefit from non-fullerene acceptors (NFA) due to their high absorption coefficients, tunable frontier energy levels, and optical gaps, as well as their …
One of the key results of our analysis is that in organic solar cells, PCE loss owing to electronic disorder and the sizeable binding energy of the excitons has been almost completely eliminated ...
Recombination energy loss is the main impediment on improving the power conversion efficiency of organic solar cells (OSCs). The pernicious effect is usually induced by two dynamics, that is, the geminate recombination of nascent charge pairs soon after the exciton dissociation and nongeminate recombination of separated charges during their transportation. Both hinder …
Luo, Z. et al. Reduced energy loss enabled by a chlorinated thiophene-fused ending-group small molecular acceptor for efficient nonfullerene organic solar cells with 13.6% efficiency. Adv. Energy ...
The large non-radiative voltage loss is the core limitation for the rapid development of nonfullerene solar cells. Here, by analyzing PBDB-T/PM6:IXIC-4Cl and other systems, we identified the formation of NFA triplet exciton from free-carrier recombination as a main non-radiative recombination and energy loss channel. More importantly, we show that the …
A recombination and exciton loss mechanism is reported in organic solar cells involving energy transfer between charge transfer (CT) excitons and polarons, impacting photocurrent generation, particularly in the near-infrared where …
The minimization of nonradiative recombination losses is essential to transcend the efficiency of state-of-the-art organic solar cells (OSCs) and near-infrared (NIR) organic light-emitting diodes (OLEDs). Indeed, …
The increase in the performance of organic solar cells observed over the past few years has reinvigorated the search for a deeper understanding of the loss and ... The relevant energy levels involved in the photogeneration: (1) formation of exciton via photon absorption; (2) exciton diffusion to the donor:acceptor (D:A) interface and charge ...
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 the electronic ground state involves the formation of a charge transfer (CT) pair as intermediate.
The past few years have witnessed the rapid progress of organic solar cells (OSCs) based on non-fullerene acceptors. However, their energy losses are much larger compared with those of inorganic ...
A comparison between state-of-the-art organic solar cells (OSCs) with inorganic and perovskite technologies. a) Plot of the power conversion efficiency (PCE) as a function of optical gap energy (E opt) for single-junction solar cells.Triangles present the record PCEs for different types of inorganic or perovskite photovoltaic materials.
Reducing non‐radiative recombination is key to achieve high fill factors (FFs) in organic solar cells. While it is generally accepted that recombination proceeds via charge transfer (CT) states ...
Energy loss within organic solar cells (OSCs) is undesirable as it reduces cell efficiency 1,2,3,4 particular, non-radiative recombination loss 3 and energetic disorder 5, which are closely ...
Organic solar cells (OSCs) are considered one of the most promising photovoltaic technologies for carbon neutrality due to their low cost, solution processibility, flexibility, and lightweight. ... It is found that BPH, on the one hand, can effectively reduce the trap states caused by oxidation and suppress charge recombination. On the other ...
Recombination losses in organic photovoltaics (OPVs) remain a performance-limiting factor, including bulk trap-assisted recombination and interfacial recombination at the electrode:active layer interface. In this work, we …
However, the development of high-performance WBG organic materials seriously lags behind the LBG semiconductors, with the existing WBG organic solar cells suffering high energy loss (E loss = E g − qV oc, where E g is the bandgap, q is the elementary charge, and V OC is the open circuit voltage) and poor photoresponse below 550 nm.
Abstract Organic solar cells (OSCs) have recently shown a rapid improvement in their performance, bringing power conversion efficiencies to above 18%. ... [10, 17] where most OSCs show stronger multi-phonon nonradiative recombination rates, termed the energy gap law. ... (EP/M01083X/1 and EP/M005143/1) and the Strategic University Network to ...
In this work, a range of nonfullerene organic solar cells comprising two perylene diimide (PDI)-based small molecule acceptors in combination with four representative polymer donors have been investigated and compared. In addition to significant differences in the power conversion efficiency, the energy losses of photovoltaic devices vary widely for these two PDI …
The inability to accurately measure the charge-generating energy states in organic solar cells makes elucidating the photovoltaic effect in these devices difficult. Here, the authors report charge ...
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.
Reducing non-radiative recombination energy loss (ΔE 3) is one key to boosting the efficiency of organic solar cells. Although the recent studies have indicated that the Y-series asymmetric acceptors-based devices featured …
The high non-radiative energy loss is a bottleneck issue for efficient organic solar cells. Here, the authors regulate the charge transfer state disorder and rate of back …
Recombination losses in organic photovoltaics (OPVs) remain a performance-limiting factor, including bulk trap-assisted recombination and interfacial recombination at the electrode:active layer interface. In this work, we demonstrate the role of the front electrode:active layer interface in a narrow-band-gap system, PCE10:COTIC-4F, a promising candidate for …
1 Introduction. Non-radiative recombination limits both the open circuit voltage (V OC) and the fill factor (FF) of organic solar cells (OSCs).[1, 2] Although some of the losses in FF could be reduced by moving from fullerene to non-fullerene …
For solar cells made from oligo-thienylenevinylene-based donors and phenyl-C71 butyric acid Me ester (PC71BM), it was found that the voltage loss due to the finite breadth of the absorption edge is remarkably small, < 0.01 eV in the best cases, while the voltage loss due to nonradiative recombination reaches 0.29 eV, one of the smallest values ...
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 ...
A concise overview of organic solar cells, also known as organic photovoltaics (OPVs), a 3rd-generation solar cell technology. ... The steps that govern OPV function Recombination The Development of Organic Solar Cells Fabrication …
The low open-circuit voltage is a significant drawback of organic solar cells; improving V OC would definitely boost the commercialization of organic solar cells . 1.2 Charge-Transfer States and Geminate Charge Recombination. In this section we discuss in more detail the role of CT states.
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