The open-circuit voltage of organic solar cells is usually lower than the values achieved in inorganic or perovskite photovoltaic devices with comparable bandgaps. Energy losses during charge separation at the donor–acceptor interface and non-radiative recombination are among the main causes of such voltage losses.
The large voltage losses usually encountered in organic solar cells significantly limit the power conversion efficiencies (PCEs) of these devices, with the result that the current highest PCE values in single-junction organic photovoltaic remain smaller than for other solar cell technologies, such as crystalline silicon or perovskite solar cells.
Recently, high-efficiency, low-band-gap solar cells have been reported that show low non-radiative voltage losses, indicating that the CT-state energy is not the only parameter to control Voc losses in organic devices. What properties of the individual molecules affect the charge-transfer state?
VOC is limited in OSCs due to significant voltage losses associated with non-radiative recombination of charge carriers, referred to as non-radiative voltage losses (VNR) 16, 17. The reported VNR for high-efficiency OSCs is as high as 0.20–0.30 V 18, 19, while high-efficiency inorganic solar cells have a VNR of only 0.05 V 20, 21.
Organic photovoltaic (OPV) devices traditionally show low Voc relative to their optical absorption threshold (compared with that of other solar cell types). The large Voc loss is assigned to both the need for a donor–acceptor heterojunction to split excitons and fast charge recombination.
Eisner, F. D. et al. Hybridization of local exciton and charge-transfer states reduces nonradiative voltage losses in organic solar cells. J. Am. Chem. Soc. 141, 6362–6374 (2019). Chen, X.-K. et al. A unified description of non-radiative voltage losses in organic solar cells. Nat. Energy 6, 799–806 (2021).
Understanding the low voltage losses in high …
The main focus of this study is on understanding the voltage losses in high performance NFA-based solar cells, as furthering the knowledge in this area is critical in promoting their recent success. In this article, the open circuit …
Hybridization of Local Exciton and Charge-Transfer States Reduces ...
A number of recent studies have shown that the nonradiative voltage losses in organic solar cells can be suppressed in systems with low energetic offsets between donor …
Decreasing exciton dissociation rates for reduced voltage losses …
Continued development of organic donor and acceptor (D/A) photovoltaic materials 1,2,3,4,5 has resulted in power conversion efficiencies (PCE) of organic solar cells …
Factors Controlling Open-Circuit Voltage Losses in …
Figure 5 Typical Ranges of Voltage Losses in Organic Solar Cells. Absorption-onset voltage losses (red circles) and non-radiative voltage losses (blue squares) as a function of V oc for some recent organic …
(PDF) Understanding the low voltage losses in high …
Photovoltaic characterization. (a) Current density-voltage (J-V) curves of typical D18:Y6 and D18:PC71BM solar cells in the dark and under AM1.5G illumination (100 mW cm À2 ).
Reducing Voltage Losses of Organic Solar Cells against …
Voltage losses are one of the main obstacles for further improvement in the power conversion efficiency of organic solar cells. In this work, we investigate the effect of thermal stress on voltage losses in various …
Open-circuit voltage of organic solar cells: interfacial roughness ...
Organic solar cells, despite their high power conversion efficiencies, suffer from open circuit voltage losses making them less appealing in terms of applications. Here, the …
Impact of side-chain engineering on quantum efficiency and voltage ...
Increasing donor-acceptor spacing for reduced voltage loss in organic solar cells. Nat. Commun., 12 (2021), pp. 6679-6687, 10.1038/s41467-021-26995-1. View in Scopus …
Charge transfer state characterization and voltage losses of organic ...
A correct determination of voltage losses is crucial for the development of organic solar cells (OSCs) with improved performance. This requires an in-depth …
Reduced voltage losses yield 10% efficient fullerene free organic solar ...
Fig. 1 Comparison of the EQE max and the voltage loss between E g / q and the V oc for different types of organic solar cells. The grey line indicates the empirical limit for the maximum EQE …
Reducing Voltage Losses in the A-DA′D-A Acceptor-Based Organic Solar Cells
The demand for electricity has grown exponentially since the Industrial Revolution. 1, 2 In this regard, solar energy is renewable, environmentally friendly, and an …
Factors Controlling Open-Circuit Voltage Losses in Organic Solar Cells
Reducing voltage losses in cascade organic solar cells while maintaining high external quantum efficiencies. Adv. Energy Mater., 7 (2017), p. 1700855. View in Scopus …
Strongly Reduced Non-Radiative Voltage Losses in …
With nearly 100% yields for mobile charge carriers in organic solar cells (OSCs), the relatively large photovoltage loss (ΔVoc) is a critical barrier limiting the power conversion efficiency of OSCs. Herein, we aim to improve …
Highly efficient organic solar cells enabled by suppressing triplet ...
Chen, Z. et al. Triplet exciton formation for non-radiative voltage loss in high-efficiency nonfullerene organic solar cells. Joule 5, 1832–1844 (2021). Article CAS Google …
Enabling low voltage losses and high photocurrent in fullerene …
Liu, X. et al. Efficient organic solar cells with extremely high open-circuit voltages and low voltage losses by suppressing nonradiative recombination losses. Adv. Energy Mater. …
Design rules for minimizing voltage losses in high …
Key optoelectronic properties for donor and acceptor organic semiconductors are identified to obtain organic solar cells with reduced open …
Prediction of non-radiative voltage losses in organic solar cells …
Machine learning is applied for the prediction of non-radiative voltage loss (ΔV NR) in Organic Solar Cells and good results have been obtained (Pearson r = 0.859) by using …
Origin of Photocurrent and Voltage Losses in Organic Solar Cells
Organic solar cells (OSCs) have recently achieved power conversion efficiencies (PCEs) of over 16%. However, there still exist large losses in photocurrent and/or voltage in …
Strongly Reduced Non-Radiative Voltage Losses in …
With nearly 100% yields for mobile charge carriers in organic solar cells (OSCs), the relatively large photovoltage loss (ΔV oc) is a critical barrier limiting the power conversion efficiency of OSCs. Herein, we aim to …
Triplet exciton formation for non-radiative voltage loss in high ...
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 …
Intrinsic non-radiative voltage losses in fullerene-based organic solar …
Accordingly, the theoretical upper limit for the power conversion efficiency of single-junction organic solar cells would be reduced to about 25.5% and the optimal optical …
Increasing donor-acceptor spacing for reduced voltage loss in organic ...
The high voltage losses ( $${V}_{{loss}}$$ ), originating from inevitable electron-phonon coupling in organic materials, limit the power conversion efficiency of organic …
Reducing Voltage Losses in the A-DA′D-A Acceptor-Based Organic …
Understand the origin of the charge generation and non-radiative losses in organic solar cells in state-of-the-art non-fullerene-based systems to further improve current …
Disorder‐Induced Open‐Circuit Voltage Losses in Organic Solar Cells ...
The photoinduced open-circuit voltage (V oc) loss commonly observed in bulk heterojunction organic solar cells made from amorphous polymers is investigated is observed that the total …
Reducing voltage losses in organic solar cells based on fluorinated ...
In this study, we investigate solar cells based on both fluorinated and non-fluorinated acceptors and identify the cause of the reduced V oc in solar cells with fluorinated …
Charge transfer state characterization and voltage …
A correct determination of voltage losses is crucial for the development of organic solar cells (OSCs) with improved performance. This requires an in-depth understanding of the properties of interfacial charge …
The voltage loss in organic solar cells
Eisner F D, Azzouzi M, Fei Z, et al. Hybridization of local exciton and charge-transfer states reduces nonradiative voltage losses in organic solar cells. J Am Chem Soc, 2019, 141, 6362 …