Exploring the effects of interfacial carrier transport layers on device performance and optoelectronic properties of planar perovskite solar cells

Khadka, Dhruba B.; Shirai, Yasuhiro; Yanagida, Masatoshi; Ryan, James W.; Miyano, Kenjiro

doi:10.1039/c7tc02822a

Cited by 114 publications

(97 citation statements)

References 68 publications

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“…[35] Changes in the Li 1s region are undetectable because of the low response sensitivityf actor of lithium (RSF = 0.025) compared with the other elements (1 to F1s, 0.668 to S2p, and 3.59 to Co 2p). Khadka et al [36] reported similar behavior,m entioning that this can happenb ecause of an umber of factors such as accelerated interfacial recombination,b ulk defect activities, or contact limited transport. In particular,t he atomicp ercentageo f Fi ncreases from 6.5 to 10.9 at.…”

Section: Resultsmentioning

confidence: 80%

“…Actually,t his explains why PTAA has been reported to produce very stable cells with minimal PCE losses, even when running at 85 8Cf or 500 h, as these aged devices are then characterized at room temperature. [2] The photovoltaic performance as af unction of temperature showsn os ignificant impact on J sc for the PTAA device but a [36] reported similar behavior,m entioning that this can happenb ecause of an umber of factors such as accelerated interfacial recombination,b ulk defect activities, or contact limited transport. When devices are submitted to high temperatures and then returned back to room temperature, the additivese vaporate and so the mobility of these aged HELs becomes closert o the pristine values.…”

Section: Resultsmentioning

confidence: 93%

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Temperature Impact on Perovskite Solar Cells Under Operation

2019

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Perovskite solar cells (PSC) have emerged as a promising substitute for conventional silicon panels, showing the fastest power conversion efficiency evolution within the photovoltaic field, going from 3.8 % to 23.7 % in a few years. However, PSC thermal stability is still an obstacle to their commercialization. In this study, the temperature effect on mesoporous triple‐cation perovskite solar cells with two different hole extraction materials—2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene (spiro‐OMeTAD) and poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine] (PTAA)—is assessed. The cells are exposed to thermal stress between −5 °C and 80 °C and their photovoltaic performance is monitored in situ to reproduce real operating conditions. At low temperatures, the devices present very stable values (average loss <5 %), but as the temperature increases significant decreases in the open circuit potential and short‐circuit current are observed. X‐ray diffraction shows no change in the perovskite crystal structure with temperature. However, electron scanning microscopy and X‐ray photoelectron spectroscopy indicate that temperature has a great impact on the hole extraction layer. The cell performance loss is attributed to the evaporation of additives added to the hole extraction layer to enhance its conductivity. Although the decrease in power conversion efficiency at 80 °C is slightly higher for PTAA cells, spiro‐OMeTAD cells present a higher irreversible loss of (21.6±2.3) % after thermal stress tests, whereas PTAA devices showed only a loss of (8.2±1.6) %.

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 93%

Temperature Impact on Perovskite Solar Cells Under Operation

2019

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“…All these properties of lead halide perovskites are superior to typical Cd‐based quantum dots (QDs). Because of these superior properties, tri‐halide lead perovskites have been widely investigated and employed in modern optoelectronic devices including solar cells, LEDs, and photodetectors . Although, all‐inorganic lead halide perovskite (CsPbX 3 ) NC‐based optoelectronic devices exhibit higher stability compared to their organic–inorganic hybrid counterparts.…”

Section: Introductionmentioning

confidence: 99%

Mg²⁺‐Alloyed All‐Inorganic Halide Perovskites for White Light‐Emitting Diodes by 3D‐Printing Method

Adhikari

Thapa

Zhu

et al. 2019

Advanced Optical Materials

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All‐inorganic halide perovskites (CsPbX3, X = Cl−, Br−, and I−) are brought to the forefront of research focus in the field of modern lighting technology. However, due to the toxic element (Pb2+), environmentally friendly white‐light emissions are difficult to achieve, thus limiting their practical applications. Herein, high‐quality Mg2+‐alloyed CsPb1−x Mgx X3 (up to 20%) nanocrystals (NCs) are synthesized. The structural and optical properties are investigated. The application of these NCs in white‐light‐emitting diodes (LEDs) is also demonstrated. The incorporation of Mg2+ into CsPb1−x Mgx X3 NCs results in a lattice contraction without a change in structure and morphology, blue‐shifts in the photoluminescence emission, and increased bandgap. Then, the tunable emission (≈408–650 nm) is obtained by adjusting the compositions of different halides (for 20% Mg2+). Most importantly, for the first time, 3D printed thin color conversion layers for different color emitting NCs (green, yellow, and red) are stacked on top of the blue‐LEDs to achieve high‐quality white light emission. A bright neutral white‐light with a correlated‐color temperature of 5806 K, a high color‐rendering index of 89, CIE coordinates of (0.32, 0.33), a small Duv (<0.003), and high luminous efficacy of radiation of 280 lm W−1 is achieved.

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“…The reason for this is shown in the SEM image. The longer the delay time, the smaller the grain size of the perovskite film, the worse the film quality, and the more defects inside the film, so fewer photo-generated carriers are injected into the dense TiO 2 layer in the perovskite absorption layer and the quenching ability of the carriers is weakened [22,23]. We measured significant emissions at 782 nm, 779 nm and 775 nm at 0 s, 5 s and 10 s [24].…”

Section: Resultsmentioning

confidence: 99%

Impact of Delay Time before Annealing MAI-PbI2-DMSO Intermediate Phase on Perovskite Film Quality and Photo-Physical Properties

et al. 2019

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High-performance perovskite solar cells are strongly dependent on the quality of the perovskite layer. Two-step sequential deposition of CH 3 NH 3 PbI 3 (MAPbI 3 ) films is widely used to fabricate perovskite solar cells and many factors influence the quality of perovskite films, such as the delay time before annealing the MAI-PbI 2 -DMSO intermediate phase, which would impact the morphology and photo-physical properties of perovskite thin films. Here, the experimental research indicates that the impact of the delay time before annealing the MAI-PbI 2 -DMSO intermediate phase on the quality, crystallinity, and photo-physical properties of perovskite film is crucial. During the delay process, the delay time before annealing the MAI-PbI 2 -DMSO intermediate phase plays an important role in the nucleation process of perovskite grains inside the intermediate phase. With the extension of the delay time before annealing, the quality of the perovskite film deteriorates, thus the photo-physical properties change. We found that after the localized liquid-liquid diffusion of MAI and PbI 2 , with the extension of the delay time before annealing the MAI-PbI 2 -DMSO intermediate phase, the nucleation number of the perovskite grains increases and the grain size becomes smaller. Therefore, with the extension of the delay time before annealing, the device performance deteriorates.

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Exploring the effects of interfacial carrier transport layers on device performance and optoelectronic properties of planar perovskite solar cells

Abstract: The performance of perovskite device was found to be influenced by the interface quality and bulk defect activities induced in perovskite grown on HTL during device fabrication.

Cited by 114 publications

References 68 publications

Temperature Impact on Perovskite Solar Cells Under Operation

Temperature Impact on Perovskite Solar Cells Under Operation

Mg²⁺‐Alloyed All‐Inorganic Halide Perovskites for White Light‐Emitting Diodes by 3D‐Printing Method

Impact of Delay Time before Annealing MAI-PbI2-DMSO Intermediate Phase on Perovskite Film Quality and Photo-Physical Properties

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Exploring the effects of interfacial carrier transport layers on device performance and optoelectronic properties of planar perovskite solar cells

Abstract: The performance of perovskite device was found to be influenced by the interface quality and bulk defect activities induced in perovskite grown on HTL during device fabrication.

Cited by 114 publications

References 68 publications

Temperature Impact on Perovskite Solar Cells Under Operation

Temperature Impact on Perovskite Solar Cells Under Operation

Mg2+‐Alloyed All‐Inorganic Halide Perovskites for White Light‐Emitting Diodes by 3D‐Printing Method

Impact of Delay Time before Annealing MAI-PbI2-DMSO Intermediate Phase on Perovskite Film Quality and Photo-Physical Properties

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Mg²⁺‐Alloyed All‐Inorganic Halide Perovskites for White Light‐Emitting Diodes by 3D‐Printing Method