Revealing fundamentals of charge extraction in photovoltaic devices through potentiostatic photoluminescence imaging

Wagner, Lukas; Schygulla, Patrick; Herterich, Jan; Elshamy, Mohamed; Bogachuk, Dmitry; Zouhair, Salma; Mastroianni, Simone; Würfel, Uli; Liu, Yuhang; Zakeeruddin, Shaik M.; Grätzel, Michaël; Hinsch, Andreas; Glunz, Stefan W.

doi:10.1016/j.matt.2022.05.024

Cited by 19 publications

(24 citation statements)

References 45 publications

(45 reference statements)

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“…Figure S2 shows that the luminous intensity of the MAPbI 3 films containing BZMIMCl was significantly higher than that of the pristine MAPbI 3 films. On the one hand, this finding can be attributed to the enhanced perovskite crystallization after the introduction of BZMIMCl. − On the other hand, the perovskite layer formed at the interface between carbon and perovskites may serve as an electron-blocking layer, preventing surface recombination at this interface. Such a thin electron-blocking layer is quite effective at boosting the FF and V OC of the PSCs. , Furthermore, a blue shift of the emission peak from 761.71 to 757.71 nm was observed (Figure S2), which may be due to the additional radiative recombination in the MAPbI 3 layer with BZMIMCl.…”

Section: Resultsmentioning

confidence: 99%

Two Birds with One Stone: Defect Passivation and Energy Level Optimization Achieved by Using Ionic Liquid Additives for Printable Mesoscopic Perovskite Solar Cells with Efficiency beyond 16%

Wang

Chen

et al. 2023

ACS Appl. Energy Mater.

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Printable mesoscopic perovskite solar cells (p-MPSCs) have received extensive attention from researchers and entrepreneurs worldwide because of their low cost, simple manufacturing process, and feasible fabricate in air. However, the wide application of p-MPSCs is limited by their relatively low power conversion efficiency (PCE). Herein, we propose a performance enhancement strategy for p-MPSCs by introducing 1-benzyl-3-methylimidazolium chloride (BZMIMCl) ionic liquid into a perovskite precursor. The BZMIMCl ionic liquid optimized the crystallization of perovskite films, modulated the energy band alignment of the perovskite, and improved carrier transport, thereby enhancing the overall photovoltaic parameters and stability of p-MPSCs. The champion PCE of the BZMIMCl-optimized device was 16.06%. Moreover, the unencapsulated p-MPSCs containing BZMIMCl maintained ∼89.6% of its maximum value after being stored for 60 days in an atmospheric environment (25 ± 5 °C @ 50 ± 5% RH, in the dark). This work further promotes the application of ionic liquids in the development of efficient p-MPSCs.

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Section: Resultsmentioning

confidence: 99%

Two Birds with One Stone: Defect Passivation and Energy Level Optimization Achieved by Using Ionic Liquid Additives for Printable Mesoscopic Perovskite Solar Cells with Efficiency beyond 16%

Wang

Chen

et al. 2023

ACS Appl. Energy Mater.

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“…The extraction coefficient that characterizes the charge carrier extraction processes, approximately, can be defined by the following relation c ex ( V ) ≈ J sc J gen where J gen is the current density of photogenerated charge carriers and J sc is short-circuit current density . The current of photogenerated carriers in solar cells includes two components: current density due to holes ( J p ) and electrons ( J n ).…”

Section: Resultsmentioning

confidence: 99%

Stepping toward Portable Optoelectronics with SnO₂ Quantum Dot-Based Electron Transport Layers

Kiani,

Parkhomenko,

Mangrulkar

et al. 2023

ACS Omega

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With a power conversion efficiency (PCE) of more than 25%, perovskite solar cells (PSCs) have shown an immense potential application for solar energy conversion. Owing to lower manufacturing costs and facile processibility via printing techniques, PSCs can easily be scaled up to an industrial scale. The device performance of printed PSCs has been improving steadily with the development and optimization of the printing process for the device functional layers. Various kinds of SnO2 nanoparticle (NP) dispersion solutions including commercial ones are used to print the electron transport layer (ETL) of printed PSCs, and high processing temperatures are often required to obtain ETLs with optimum quality. This, however, limits the application of SnO2 ETLs in printed and flexible PSCs. In this work, the use of an alternative SnO2 dispersion solution based on SnO2 quantum dots (QDs) to fabricate ETLs of printed PSCs on flexible substrates is reported. A comparative analysis of the performance and properties of the obtained devices with the devices fabricated employing ETLs made with a commercial SnO2 NP dispersion solution is carried out. The ETLs made with SnO2 QDs are shown to improve the performance of devices by ∼11% on average compared to the ETLs made with SnO2 NPs. It is found that employing SnO2 QDs can reduce trap states in the perovskite layer and improve charge extraction in devices.

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“…If charge transfer is ineffective, generated charge electrons and holes recombine, which results in photoluminescence. 22,23 Thus, for such devices, photoluminescence is a parasitic effect, and the lower it is, the better performance they show. 24,25 Based on this principle, the efficiency of solar cells can be predicted by measuring only photoluminescence without directly examining the fill factor.…”

Section: ■ Introductionmentioning

confidence: 99%

“…While conductive layers provide nonradiative exciton decay pathways, exciton dissociation in the barrier field, and charge transfer, which is necessary to collect generated charge carriers to produce bias voltage. − In such devices, the interface conditions determine the efficiency of charge transfer between the absorber (semiconductive layer) and collector (conductive layer). If charge transfer is ineffective, generated charge electrons and holes recombine, which results in photoluminescence. , Thus, for such devices, photoluminescence is a parasitic effect, and the lower it is, the better performance they show. , Based on this principle, the efficiency of solar cells can be predicted by measuring only photoluminescence without directly examining the fill factor . The presence of interface contamination can promote radiative recombination due to hampering charge transfer.…”

Section: Introductionmentioning

confidence: 99%

Effect of Interfacial Contamination on the Charge Redistribution and Photoluminescence of the MoSe₂/Au Heterostructure: Implications for Photodevices

Borodin

Benimetskiy

Davydov

et al. 2023

ACS Appl. Nano Mater.

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Van der Waals (vdW) heterostructures are promising for next-generation two-dimensional electronic and optoelectronic devices. The performance of such devices is completely determined by the properties of the interface. However, due to a lack of contamination-free fabrication techniques, obtaining an ideal interface is still a challenge. Meanwhile, the efficiency of photodetectors and solar cells is highly dependent on the charge separation on the interface. Thus, the questions on the effect of interfacial conditions on a contact type, charge redistribution, and photoluminescence still exist. In this work, the effect of interfacial conditions on the optical and electronic properties of MoSe2/Au heterostructure is studied. The tip of an atomic force microscope is used to clean the interface and change interfacial conditions. Kelvin probe microscopy revealed that the work function of the MoSe2 monolayer increases by 40 meV, the bilayer by 28 meV, and the trilayer by 12 meV due to charge redistribution after the cleaning. Micro-photoluminescence (μ-PL) investigation shows that the cleaning leads to the fall of photoluminescence intensity of about 75% for a monolayer and 60% for a bilayer. Raman spectroscopy indicates that the cleaning procedure did not damage the MoSe2 flake. It is shown that the presence of interfacial contamination in vdW heterostructures severely affects its electronic and optical properties. The results of the work are of great importance to vdW device fabrication.

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Revealing fundamentals of charge extraction in photovoltaic devices through potentiostatic photoluminescence imaging

Cited by 19 publications

References 45 publications

Two Birds with One Stone: Defect Passivation and Energy Level Optimization Achieved by Using Ionic Liquid Additives for Printable Mesoscopic Perovskite Solar Cells with Efficiency beyond 16%

Two Birds with One Stone: Defect Passivation and Energy Level Optimization Achieved by Using Ionic Liquid Additives for Printable Mesoscopic Perovskite Solar Cells with Efficiency beyond 16%

Stepping toward Portable Optoelectronics with SnO₂ Quantum Dot-Based Electron Transport Layers

Effect of Interfacial Contamination on the Charge Redistribution and Photoluminescence of the MoSe₂/Au Heterostructure: Implications for Photodevices

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Revealing fundamentals of charge extraction in photovoltaic devices through potentiostatic photoluminescence imaging

Cited by 19 publications

References 45 publications

Two Birds with One Stone: Defect Passivation and Energy Level Optimization Achieved by Using Ionic Liquid Additives for Printable Mesoscopic Perovskite Solar Cells with Efficiency beyond 16%

Two Birds with One Stone: Defect Passivation and Energy Level Optimization Achieved by Using Ionic Liquid Additives for Printable Mesoscopic Perovskite Solar Cells with Efficiency beyond 16%

Stepping toward Portable Optoelectronics with SnO2 Quantum Dot-Based Electron Transport Layers

Effect of Interfacial Contamination on the Charge Redistribution and Photoluminescence of the MoSe2/Au Heterostructure: Implications for Photodevices

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Product

Resources

About

Stepping toward Portable Optoelectronics with SnO₂ Quantum Dot-Based Electron Transport Layers

Effect of Interfacial Contamination on the Charge Redistribution and Photoluminescence of the MoSe₂/Au Heterostructure: Implications for Photodevices