Sequential solvent processing with hole transport materials for improving efficiency of traditionally-structured perovskite solar cells

Tong, Tengteng; Li, X.H.; Guo, Shaohui; Han, Jian; Wei, Bingqing

doi:10.1016/j.nanoen.2017.09.050

Cited by 26 publications

(21 citation statements)

References 55 publications

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“…The optimized large‐grain effect device showed a PCE of 17.20% (Figure b, Figure S3, and Table S1, Supporting Information). The optimized mixed‐layer effect device showed a PCE of 18.36% (Figure b and Table ) . Thus, the dual‐effect devices exhibited better performance than the devices with single effect.…”

Section: Resultsmentioning

confidence: 92%

“…To highlight the advantages of the dual‐effect device, two single effect devices have been fabricated for comparison. One contains only an interdiffusion layer between the MAPbI 3 film and the HTM film (Figure b, termed as the mixed‐layer effect device; see the experimental section for details) . The second one contains only large sized perovskite grains (Figures b and d, termed as large‐grain effect device; see the experimental section for details).…”

Section: Resultsmentioning

confidence: 99%

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Sequential Processing: Spontaneous Improvements in Film Quality and Interfacial Engineering for Efficient Perovskite Solar Cells

Wang

Tong

et al. 2018

Solar RRL

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Planar perovskite solar cells (PSCs) represent a promising alternative to solar cells due to their many advantages. To improve device performance, it is necessary to develop PSCs with good interfacial engineering and film crystallinity, which are two critical aspects of high‐performance PSCs. However, both aspects are relatively independent and difficult to simultaneously enhance. This study reports an effective and universal sequential solution deposition process to specifically address this issue. When the top layer of the hole‐transport material (HTM) is deposited from the dimethylsulfoxide (DMSO) cosolvent, the HTM penetrates a predeposited bottom layer of perovskite (the light‐absorption layer) during the spin‐coating process, resulting in an interdiffusion structure with layer‐evolved nanomorphology. In addition, the cosolvent DMSO captures vacant perovskite CH3NH3+ groups at the boundaries of perovskite grains, resulting in the growth of large‐sized grains. Compared to a conventional device, this new design realizes enhanced optical absorption, reduced crystal defects in perovskite film, tight contact, and well‐matched energy‐level alignment between the perovskite film and the hole‐transport layer (HTL). This strategy enables the fabrication of PSCs with enhanced short‐circuit current density (Jsc), fill factor (FF), and open circuit voltage (Voc), resulting in an enhanced power conversion efficiency (PCE) of 19.40% from 15.29% under standard testing conditions. This sequential deposition represents a feasible route for the preparation of high‐performance PSCs with spontaneous improvements in film quality and interfacial engineering for photovoltaic applications.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Sequential Processing: Spontaneous Improvements in Film Quality and Interfacial Engineering for Efficient Perovskite Solar Cells

Wang

Tong

et al. 2018

Solar RRL

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“…From the dependence of V oc on light intensity in Figure b, the control device showed a slope of 1.67 kT / q , where k is the Boltzmann constant, T is the absolute temperature, and q is the elementary charge. For the PSC based on solvent vapor‐annealed spiro‐OMeTAD, the slope decreased to 1.25 kT / q , indicating reduced trap‐assisted recombination at the interface . The reduced interfacial defect creation due to the improved contact between the perovskite and spiro‐OMeTAD could suppress carrier traps .…”

Section: Resultsmentioning

confidence: 99%

Improving the Performance of Perovskite Solar Cells Through Solvent Vapor Annealing‐based Morphology Control of the Hole‐Transport Layer

et al. 2018

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In this work, we improved the performance of perovskite solar cells (PSCs) by controlling the morphology of 2,2′,7,7′‐tetrakis‐(N,N‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene (spiro‐OMeTAD) layers using a solvent vapor annealing method. We found that this technique could result in a smoother morphology of the spiro‐OMeTAD layer, which further improved the contacts at the perovskite/spiro‐OMeTAD and spiro‐OMeTAD/Au interfaces. Consequently, the power conversion efficiency (PCE) of PSCs improved from 14.62 to 16.73 % along with simultaneous enhancements of the open‐circuit voltage, short‐circuit current density, and fill factor. The hysteresis of the PSCs decreased significantly from 4.4 to 0.6 %. Moreover, the degradation in the PCE of the PSCs for long‐term storage was reduced from 19 to 14 % over the period of 144 hours. The best PSC based on a solvent vapor‐annealed spiro‐OMeTAD layer exhibited a high PCE of 17.15 % with a stable power output. Our results indicate that using solvent vapor annealing to control the morphology of spiro‐OMeTAD layers is an effective method for fabricating high‐performance PSCs.

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“…The series resistance ( R S ) and shunt resistance ( R SH ) were extracted from the dark J – V measurement (Figure b) . The R S and R SH of meth‐annealed Sb 2 S 3 devices were 8.50 and 534.14 Ω cm 2 , respectively, while they were 18.32 and 414.46 Ω cm 2 for the control devices (Table ).…”

Section: Resultsmentioning

confidence: 99%

Alcohol Vapor Post‐Annealing for Highly Efficient Sb₂S₃ Planar Heterojunction Solar Cells

et al. 2019

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Solution‐processed Sb2S3 planar heterojunction solar cells have shown great progress in power conversion efficiency (PCE) in recent years. However, a conventional solution process yields Sb2S3 films with a small grain size. Herein, an alcohol vapor post‐annealing strategy is reported that uses alcohol vapors to facilitate grain growth of Sb2S3 films during annealing, achieving films with a larger grain size and better crystallinity. A series of alcohols with different polarities are used for the vapor post‐annealing. Methanol with the highest polarity provides films with the largest grain size. As a result, the Sb2S3 films prepared via vapor post‐annealing show enhanced light absorption, longer carrier lifetime, and less carrier recombination, which are verified by photoluminescence, transient photovoltage, suns‐short‐circuit photocurrent density, and suns‐open‐circuit voltage measurements. The Sb2S3 solar cells post‐annealed with methanol vapor exhibit a PCE of 5.27%, showing a drastic improvement of 31% compared with the non‐treated devices. The alcohol vapor post‐annealing approach presents a new avenue toward controlling the morphology and crystallinity of solution‐processed Sb2S3 films and achieving efficient Sb2S3 solar cells.

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Sequential solvent processing with hole transport materials for improving efficiency of traditionally-structured perovskite solar cells

Cited by 26 publications

References 55 publications

Sequential Processing: Spontaneous Improvements in Film Quality and Interfacial Engineering for Efficient Perovskite Solar Cells

Sequential Processing: Spontaneous Improvements in Film Quality and Interfacial Engineering for Efficient Perovskite Solar Cells

Improving the Performance of Perovskite Solar Cells Through Solvent Vapor Annealing‐based Morphology Control of the Hole‐Transport Layer

Alcohol Vapor Post‐Annealing for Highly Efficient Sb₂S₃ Planar Heterojunction Solar Cells

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Sequential solvent processing with hole transport materials for improving efficiency of traditionally-structured perovskite solar cells

Cited by 26 publications

References 55 publications

Sequential Processing: Spontaneous Improvements in Film Quality and Interfacial Engineering for Efficient Perovskite Solar Cells

Sequential Processing: Spontaneous Improvements in Film Quality and Interfacial Engineering for Efficient Perovskite Solar Cells

Improving the Performance of Perovskite Solar Cells Through Solvent Vapor Annealing‐based Morphology Control of the Hole‐Transport Layer

Alcohol Vapor Post‐Annealing for Highly Efficient Sb2S3 Planar Heterojunction Solar Cells

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Alcohol Vapor Post‐Annealing for Highly Efficient Sb₂S₃ Planar Heterojunction Solar Cells