High performance planar perovskite solar cells by ZnO electron transport layer engineering

An, Qingzhi; Faßl, Paul; Hofstetter, Yvonne J.; Becker‐Koch, David; Bausch, Alexandra; Hopkinson, Paul E.; Vaynzof, Yana

doi:10.1016/j.nanoen.2017.07.013

Cited by 125 publications

(95 citation statements)

References 65 publications

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“…Li et al have employed EDTA to passivate ZnO-based ETL and demonstrated improved performance of the organic solar cells 45 . However, when the EDTA–ZnO layer is used in the present perovskite cells, the hydroxyl groups or acetate ligands on the ZnO surface react with the perovskite and proton transfer reactions occur at the perovskite/ZnO interface, leading to poor device performance 46 .…”

Section: Introductionmentioning

confidence: 99%

High efficiency planar-type perovskite solar cells with negligible hysteresis using EDTA-complexed SnO2

et al. 2018

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Even though the mesoporous-type perovskite solar cell (PSC) is known for high efficiency, its planar-type counterpart exhibits lower efficiency and hysteretic response. Herein, we report success in suppressing hysteresis and record efficiency for planar-type devices using EDTA-complexed tin oxide (SnO2) electron-transport layer. The Fermi level of EDTA-complexed SnO2 is better matched with the conduction band of perovskite, leading to high open-circuit voltage. Its electron mobility is about three times larger than that of the SnO2. The record power conversion efficiency of planar-type PSCs with EDTA-complexed SnO2 increases to 21.60% (certified at 21.52% by Newport) with negligible hysteresis. Meanwhile, the low-temperature processed EDTA-complexed SnO2 enables 18.28% efficiency for a flexible device. Moreover, the unsealed PSCs with EDTA-complexed SnO2 degrade only by 8% exposed in an ambient atmosphere after 2880 h, and only by 14% after 120 h under irradiation at 100 mW cm−2.

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Section: Introductionmentioning

confidence: 99%

High efficiency planar-type perovskite solar cells with negligible hysteresis using EDTA-complexed SnO2

et al. 2018

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“…9,10 Complementing these efforts are improvements in charge extraction layers with a wide range of materials being explored up to now, such as organic polymers, [11][12][13] small molecules [14][15][16] and metal oxides. [17][18][19] It has been shown that both the mobility and the energetic alignment of the charge extraction layers and the perovskite active layer may influence the final device performance, 20 in particular the open-circuit voltage of the device. One of the key challenges in optimizing charge extraction layers originates from the need to preserve the high quality of the perovskite active layer.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Open-Circuit Voltage of Perovskite Solar Cells by Embedding Molecular Dipoles within Their Hole-Blocking Layer

Butscher

Intorp

Kreß

et al. 2019

ACS Appl. Mater. Interfaces

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Engineering the energetics of perovskite photovoltaic devices through the deliberate introduction of dipoles to control the built-in potential of the devices offers the opportunity to enhance their performance without the need to modify the active layer itself. In this work, we demonstrate how the incorporation of molecular dipoles into the bathocuproine (BCP) hole-blocking layer of inverted perovskite solar cells improves the device open-circuit voltage (VOC) and consequently, its performance. We explore a series of four thiaazulenic derivatives that exhibit increasing dipole moments and demonstrate that these molecules can be introduced into the solution-processed BCP layer to effectively increase the built-in potential within the device, without altering any of the other device layers. As a result the VOC of the devices is enhanced by up to 130 mV with larger dipoles resulting in higher VOCs. To investigate the limitations of this approach, we employ numerical device simulations that demonstrate that the highest dipole derivatives used in this work eliminate all limitations on the VOC stemming from the built-in potential of the device.

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“…Organic–inorganic hybrid perovskite solar cells (PSCs) have been regarded as one of the most promising photovoltaic technologies because of their unique advantages, such as broadband absorption, excellent carrier transport, low cost materials, and solution processing at relatively low‐temperatures . Electron transporting layers (ETLs), connecting the perovskite active layer and the electrode, play a critical role in determining the overall performance .…”

Section: Introductionmentioning

confidence: 99%

Inverted MAPbI₃ Perovskite Solar Cells with Graphdiyne Derivative‐Incorporated Electron Transport Layers Exceeding 20% Efficiency

Wang

et al. 2019

Solar RRL

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Chlorine‐substituted graphdiyne (ClGD) is employed into electron transport layers (ETLs) of MAPbI3‐based perovskite solar cells for the first time, forming a high‐quality film with superior film morphology and electrical conductivity as compared with pristine [6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM) film. Strikingly, a champion power conversion efficiency of 20.34% is achieved, showing a 19% enhancement compared with the counterparts (17.08%). Simultaneously, ClGD‐PCBM‐based devices show suppressed J–V hysteresis. It is experimentally and theoretically demonstrated that the interactions of derivated graphdiyne and PCBM stem from four types of noncovalent bonds, which contribute to the improved device performance. The results suggest that derivated graphdiyne‐based interfacial material is promising for the applications in solar cells and other photoelectric devices.

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High performance planar perovskite solar cells by ZnO electron transport layer engineering

Cited by 125 publications

References 65 publications

High efficiency planar-type perovskite solar cells with negligible hysteresis using EDTA-complexed SnO2

High efficiency planar-type perovskite solar cells with negligible hysteresis using EDTA-complexed SnO2

Enhancing the Open-Circuit Voltage of Perovskite Solar Cells by Embedding Molecular Dipoles within Their Hole-Blocking Layer

Inverted MAPbI₃ Perovskite Solar Cells with Graphdiyne Derivative‐Incorporated Electron Transport Layers Exceeding 20% Efficiency

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High performance planar perovskite solar cells by ZnO electron transport layer engineering

Cited by 125 publications

References 65 publications

High efficiency planar-type perovskite solar cells with negligible hysteresis using EDTA-complexed SnO2

High efficiency planar-type perovskite solar cells with negligible hysteresis using EDTA-complexed SnO2

Enhancing the Open-Circuit Voltage of Perovskite Solar Cells by Embedding Molecular Dipoles within Their Hole-Blocking Layer

Inverted MAPbI3 Perovskite Solar Cells with Graphdiyne Derivative‐Incorporated Electron Transport Layers Exceeding 20% Efficiency

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Inverted MAPbI₃ Perovskite Solar Cells with Graphdiyne Derivative‐Incorporated Electron Transport Layers Exceeding 20% Efficiency