Derivation of the open-circuit voltage of organic solar cells

Staple, Douglas B.; Oliver, Patricia; Hill, Ian G.

doi:10.1103/physrevb.89.205313

Cited by 15 publications

(12 citation statements)

References 44 publications

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Section: D Geometriesmentioning

confidence: 98%

“…We note that V oc is pinned to the material and environmental parameters such as semiconductor energy levels, work functions of the electrodes, light intensity, solar cell and light-source temperatures, charge-carrier recombination, and external fluorescence efficiency. 82,83 However, several theoretical and experimental researches 6,[82][83][84][85][86][87] support the view that energy-gap between the acceptor LUMO and donor HOMO gives the dominant contribution to V oc for polymer BHJ OPVs. Thus, a simple and effective way to estimate V oc could be described by: 6,42…”

Section: Frontier Molecular Orbitals and Open Circuit Voltagesmentioning

confidence: 99%

See 1 more Smart Citation

A designed bithiopheneimide-based conjugated polymer for organic photovoltaic with ultrafast charge transfer at donor/PC71BM interface: theoretical study and characterization

Duan

Geng

et al. 2014

Phys. Chem. Chem. Phys.

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In the current work, a series of bithiopheneimide (BTI)-based D-A copolymers were investigated based on the reported PDTSBTI (1) to screen excellent molecules toward organic photovoltaic (OPV) donor materials. It is found that the PCE based on the proposed derivative 4, where the silicon atom is replaced with vinyl and cyano groups on the DTS unit, shows a 70 percent improvement by Scharber diagrams compared with its prototype 1. Then, the charge transfer dynamics of 1/PC71BM and 4/PC71BM were investigated, including the intermolecular charge transfer (inter-CT) and recombination (inter-CR) rates. The theoretical data demonstrate that the ratio kinter-CT/kinter-CR of 4/PC71BM heterojunction is about 1 × 10(5) times higher than that of 1/PC71BM. These results clearly reveal that the designed donor molecule 4 will be a promising candidate for high-performance OPV device. We expect that this work from electron processing at the D/A interface may provide a theoretical guideline for further optimization and design of organic copolymer donor materials.

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Section: D Geometriesmentioning

confidence: 98%

Section: Frontier Molecular Orbitals and Open Circuit Voltagesmentioning

confidence: 99%

A designed bithiopheneimide-based conjugated polymer for organic photovoltaic with ultrafast charge transfer at donor/PC71BM interface: theoretical study and characterization

Duan

Geng

et al. 2014

Phys. Chem. Chem. Phys.

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“…Recently, inverted structured OSCs with electron accepting fullerene and the electron donating polymer as the active layer have drawn great interest because of the inherent device stability and enhanced performance [6][7]. In recent times, inverted OSCs have achieved high records of power conversion efficiencies (PCE) compared with the standard architecture OSCs [8][9]. The interface between active layer and both electrodes plays the crucial role of charge extraction and collection, which require appropriate energy level alignment.…”

Section: Introductionmentioning

confidence: 99%

Inverted organic solar cells based on PTB7:PC70BM bulk heterojunction

Sharma

Negi

Yadav

et al. 2019

AIP Conference Proceedings

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This paper reports the fabrication and characterization of bulk heterojunction inverted structured organic solar cell devices (OSC) with the architecture of ITO/ZnO/PTB7:PC 70 BM/MoO3/Ag. The photovoltaic properties of OSC were examined through the analysis of various photovoltaic parameters, which includes the external quantum efficiency, short circuit current density (J sc ), and open circuit voltage (V oc ). The inverted structured OSC device showed the efficiency of 5.87 %. The achieved efficiency can be attributed to the better light harvesting capability, improved interfacial properties and improved charge collection efficiency. The AC impedance technique was employed to extract internal parameters of the fabricated devices. The obtained impedance curves evidently exhibit high-quality correlation between the obtained data and the curve fitting data.

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“…It is well known that the relevant parameters of PCE are V OC , J SC , and fill factor (FF) . The V OC is closely related to the materials and environmental parameters such as light intensity, external fluorescence efficiency, work functions of the electrodes and morphology . In order to measure this parameter more directly, several researches encourage the viewpoint that the different between the highest occupied molecular orbital (HOMO) level of donor and LUMO level of acceptor gives the dominant contribution to V OC , which require energy level of acceptor (A) and donor (D) matching better; The J SC directly depends on complementary absorption spectra of A and D, which also should suit for the solar spectrum.…”

Section: Introductionmentioning

confidence: 99%

“…The V OC is closely related to the materials and environmental parameters such as light intensity, external fluorescence efficiency, work functions of the electrodes and morphology . In order to measure this parameter more directly, several researches encourage the viewpoint that the different between the highest occupied molecular orbital (HOMO) level of donor and LUMO level of acceptor gives the dominant contribution to V OC , which require energy level of acceptor (A) and donor (D) matching better; The J SC directly depends on complementary absorption spectra of A and D, which also should suit for the solar spectrum. In addition, the interfacial dynamic rate of intermolecular charge transfer ( k inter‐CT ) should be as rapid as possible to improve J SC and FF, while the rate of intermolecular charge recombination ( k inter‐CR ) should be as slow as possible to form reasonable intermolecular π‐π interaction .…”

Section: Introductionmentioning

confidence: 99%

Design of Hexabenzocoronene Derivatives as Non-Fullerene Acceptors in Organic Photovoltaics by Bridging Dimers and Modulating Structural Twists

et al. 2017

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Non‐fullerene small molecule (SM) acceptors possess many advantages, such as simple synthesis and purification, easily modulated spectrums and energy levels compared with fullerenes. Herein, a series of acceptor molecules 1–14 based on halogenated hexabenzocoronene derivative (8F‐8Cl‐cHBC) dimers, which could be synthesized in experiment, were rationally designed via benzothiadiazole (BT) bridging and closed rings in cHBC to change structural twists. The electronic structures and energy levels related to open circuit voltage (VOC), as well as the absorption spectra related to short circuit current density (JSC) of 1–14 have been systematically investigated by density functional theory (DFT) and time‐dependent density functional theory (TD‐DFT). Meanwhile, the intermolecular charge transfer rates (kinter‐CT) and charge recombination rates (kinter‐CR) of the interface α‐sexithienyl (6T)/1–14 were investigated by Marcus semi‐classical model. The results revealed that bridging 8F‐8Cl‐cHBC dimers could significantly adjust the energy level, increase the photon collection and form spectral complementarity with donor. The change of closed rings for cHBC units could improve the morphology, adjust π‐π interaction, and form three–dimensional (3D) charge transmission, and thus increased interface electronic transmission channel. Therefore, our designed acceptors will provide a theoretical guideline for designing new non‐fullerene SM acceptors containing bridged dimers and structural twists.

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Derivation of the open-circuit voltage of organic solar cells

Cited by 15 publications

References 44 publications

A designed bithiopheneimide-based conjugated polymer for organic photovoltaic with ultrafast charge transfer at donor/PC71BM interface: theoretical study and characterization

A designed bithiopheneimide-based conjugated polymer for organic photovoltaic with ultrafast charge transfer at donor/PC71BM interface: theoretical study and characterization

Inverted organic solar cells based on PTB7:PC70BM bulk heterojunction

Design of Hexabenzocoronene Derivatives as Non-Fullerene Acceptors in Organic Photovoltaics by Bridging Dimers and Modulating Structural Twists

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