Multifunctional RbCl dopants for efficient inverted planar perovskite solar cell with ultra-high fill factor, negligible hysteresis and improved stability

Liu, Xixia; Li, Bichen; Zhang, Nengduo; Yu, Zhimeng; Sun, Kuan; Tang, Baoshan; Shi, Danli; Yao, Hongyan; Ouyang, Jianyong; Gong, Haimei

doi:10.1016/j.nanoen.2018.09.023

Cited by 81 publications

(54 citation statements)

References 63 publications

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“…It is well documented that a more favorable morphology for the overlying perovskite film would be formed on the smoother substrates. [58,59] The schematic view of CsPbIBr 2 film demonstrating the crystallization at the interfaces with different ETLs is shown in Figure S6, Supporting Information. The full solar cell is constituted from the bottom to up of 30 nm SnO 2 (with or without MgO), 300 nm CsPbIBr 2 , 160 nm Spiro-OMeTAD, and 100 nm Ag.…”

Section: Resultsmentioning

confidence: 99%

Interface Modulator of Ultrathin Magnesium Oxide for Low‐Temperature‐Processed Inorganic CsPbIBr₂ Perovskite Solar Cells with Efficiency Over 11%

et al. 2020

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Although the power conversion efficiency (PCE) of thermally stable inorganic CsPbIBr2 perovskite solar cells (PSCs) is over 10%, the severe interfacial and nonradiative recombination deteriorates the open‐circuit voltage (Voc). Herein, an ultrathin wideband MgO is mediated between the SnO2 electron transport layer (ETL) and the CsPbIBr2 photoabsorber to passivate the undesirable recombination, thereby enhancing the Voc. Meanwhile, the δ‐phase perovskite located at the interface between SnO2 ETL and CsPbIBr2 film is reduced after MgO modification, because the MgO layer provides a substrate for perovskite growth and reduces vacancy. Moreover, the tunneling effect and better band alignment effectively block holes and accelerate electrons to the electrode. Consequently, for optimal MgO‐modified devices, a shining improvement of Voc from 1.25 to 1.36 V without short‐circuit current losses boosts the champion CsPbIBr2 PSCs to obtain a PCE of 11.04%, which is the highest value among the pure‐CsPbIBr2 PSCs. However, the MgO layer significantly reduces severe hysteresis and increases device stability.

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Section: Resultsmentioning

confidence: 99%

Interface Modulator of Ultrathin Magnesium Oxide for Low‐Temperature‐Processed Inorganic CsPbIBr₂ Perovskite Solar Cells with Efficiency Over 11%

et al. 2020

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“…Figure f and Table S3, Supporting Information, summarize almost all the works with FF higher than 80% published in recent years. As can be seen from the figure, our work achieved more balanced performance with a simple dosing strategy than most of the other's work …”

Section: Resultsmentioning

confidence: 74%

Synergy of Plasmonic Silver Nanorod and Water for Enhanced Planar Perovskite Photovoltaic Devices

et al. 2019

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Perovskite solar cells (PSCs) have been widely studied during the past 10 years. Albeit the excellent light‐absorption ability, the thickness of the perovskite layer is limited to maintain effective control over morphology and carrier migration. Meanwhile, the quality of perovskite films is a crucial factor affecting the performance of final devices. The traditional one‐step process for preparing triple‐cation perovskite films suffers from small grain size, low crystallization quality, and many surface defects. Herein, in the process of triple‐cation perovskite‐based solar cells, a facile dosing strategy of a silver nanorods (AgNR) aqueous solution into the perovskite precursor is adopted. The localized surface plasmon resonance effect of AgNR enhances the light‐capture ability of the perovskite layer without increasing the thickness. At the same time, the presence of appropriate water helps to obtain high‐quality perovskite films with larger grain size and fewer defects. It is found that the synergy of AgNR and water successfully reduces the defect density and increases mobility significantly. Consequently, a power conversion efficiency of 20.18% and a short‐circuit current (JSC) of 22.08 mA cm−2 is achieved. Meanwhile, an excellent fill factor beyond 82% is reported, which is one of the highest values for triple‐cation hybrid PSCs.

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“…Take poly(3,4‐ethylenedioxythiphene):poly(styrenesulfonate) (PEDOT:PSS) as an example, which is one of the most popular hole transfer materials due to its high thermal stability, sufficient optical transparency, good mechanical flexibility, and easy adjustable carriers concentration and mobility . To enhance the carrier transport ability in the PEDOT:PSS hole transfer layer (HTL), most of the previous works are dedicated to improve the carrier concentration and mobility . Such an approach indeed can accelerate hole extraction, but the enhanced conductivity also leads to improved in‐plane charge transport, bringing more charge recombination and low fill factor (FF) .…”

Section: Methodsmentioning

confidence: 99%

Inhibition of In‐Plane Charge Transport in Hole Transfer Layer to Achieve High Fill Factor for Inverted Planar Perovskite Solar Cells

Yang

et al. 2019

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Charge extraction at the active layer‐electrode interfaces is critical in obtaining highly efficient planar perovskite solar cells (PSCs). It is commonly achieved by enhancing the charge carrier mobility of the charge transfer layer (CTL) that possesses a desirable energy level. Nevertheless, the in‐plane movement of charge carriers in the CTL possibly leads to severe charge recombination in the presence of defects at the interfaces. To verify this overlooked possibility, herein, an oxidized monolayer of poly(3,4‐ethylenedioxythiphene):poly(styrenesulfonate) (PEDOT:PSS) hole transfer layer (HTL) is constructed by water rinsing followed by H2O2 oxidation. The oxidized PEDOT:PSS monolayer ensures a high charge transfer ability from perovskite to electrode, but at the same time limits in‐plane charge transport. An inverted planar PSC fabricated on the oxidized PEDOT:PSS monolayer yields a power conversion efficiency (PCE) of 18.8%, higher than 17.0% of the control device based on a pristine PEDOT:PSS monolayer. The main contribution comes from the fill factor (FF), which is as high as 82%. Characterizations indicate that the conjugation length of PEDOT chains is decreased after H2O2 oxidation, which lowers the conductivity of PEDOT:PSS HTL in the in‐plane direction. This study suggests that the charge recombination at the electrode interfaces due to in‐plane charge transport in the CTLs is not to be neglected.

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Multifunctional RbCl dopants for efficient inverted planar perovskite solar cell with ultra-high fill factor, negligible hysteresis and improved stability

Cited by 81 publications

References 63 publications

Interface Modulator of Ultrathin Magnesium Oxide for Low‐Temperature‐Processed Inorganic CsPbIBr₂ Perovskite Solar Cells with Efficiency Over 11%

Interface Modulator of Ultrathin Magnesium Oxide for Low‐Temperature‐Processed Inorganic CsPbIBr₂ Perovskite Solar Cells with Efficiency Over 11%

Synergy of Plasmonic Silver Nanorod and Water for Enhanced Planar Perovskite Photovoltaic Devices

Inhibition of In‐Plane Charge Transport in Hole Transfer Layer to Achieve High Fill Factor for Inverted Planar Perovskite Solar Cells

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Multifunctional RbCl dopants for efficient inverted planar perovskite solar cell with ultra-high fill factor, negligible hysteresis and improved stability

Cited by 81 publications

References 63 publications

Interface Modulator of Ultrathin Magnesium Oxide for Low‐Temperature‐Processed Inorganic CsPbIBr2 Perovskite Solar Cells with Efficiency Over 11%

Interface Modulator of Ultrathin Magnesium Oxide for Low‐Temperature‐Processed Inorganic CsPbIBr2 Perovskite Solar Cells with Efficiency Over 11%

Synergy of Plasmonic Silver Nanorod and Water for Enhanced Planar Perovskite Photovoltaic Devices

Inhibition of In‐Plane Charge Transport in Hole Transfer Layer to Achieve High Fill Factor for Inverted Planar Perovskite Solar Cells

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Product

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Interface Modulator of Ultrathin Magnesium Oxide for Low‐Temperature‐Processed Inorganic CsPbIBr₂ Perovskite Solar Cells with Efficiency Over 11%

Interface Modulator of Ultrathin Magnesium Oxide for Low‐Temperature‐Processed Inorganic CsPbIBr₂ Perovskite Solar Cells with Efficiency Over 11%