Preparation of flexible perovskite solar cells by a gas pump drying method on a plastic substrate

Gao, Lili; Liang, Lusheng; Song, Xiao-Xuan; Ding, Bin; Yang, Guan-Jun; Fan, Bin

doi:10.1039/c6ta00230g

Cited by 88 publications

(80 citation statements)

References 49 publications

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“…The preovskite film was prepared by one‐step gas pump drying method, as reported before . The precursor solution was composed of iodine formamidinium (FAI), iodine methylamine (MAI), and lead iodide at the molar ratio of 0.1:0.9:1.1.…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, organometal halide perovskites have become one of the most promising photovoltaic materials for the development of solar cells because of their unique optoelectronic properties (such as large absorption, long diﬀusion length, and high mobility) and low‐cost fabrication methods (such as vapor deposition and solution‐processing) . Because of excellent optoelectronic properties, perovskite solar cells (PSCs) have attracted intense interest in recent years with a rapid increase in power conversion efficiencies beyond 22% .…”

Section: Introductionmentioning

confidence: 99%

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Excellent Stability of Perovskite Solar Cells by Passivation Engineering

et al. 2018

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The efficiencies of organic-inorganic lead halide perovskite solar cells (PSCs) have significantly increased so far, but the long-term stability of PSCs needs to be urgently improved. In this work, a novel and convenient strategy is developed to improve PSCs' stability by introducing thiourea into perovskite. Thiourea passivates perovskite by the formation of the Pb─S bond on the outermost layer of perovskite and lath-shaped grain among perovskites, which contributes to the improvement of oxygen, light, thermal stability, and little hysteresis. The mechanism is elucidated by the density functional theory calculation. In addition, the additive of thiourea into perovskite significantly improves the quality of perovskite crystal for the adduct of PbI 2 with thiourea as the Lewis base. Devices of a perovskite film with the thiourea additive achieve high efficiencies of 19.57% and 17.67% for active areas of 0.1 and 1.0 cm 2 , respectively. Most importantly, unencapsulated devices retain 98% and 93% of original efficiencies after two months under air conditions for active areas of 0.1 and 1.0 cm 2 , respectively, showing excellent stability. The present work provides a simple and effective method to improve long-term stability of PSCs.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Excellent Stability of Perovskite Solar Cells by Passivation Engineering

et al. 2018

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“…The root‐mean‐square (RMS) roughness of the MAPbI 3 –DS is increased to 11.1 from 7.76 nm for the MAPbI 3 . The slightly bigger RMS is reported to help light trapping, which is beneficial to enhanced J sc . Figure d shows the X‐ray diffraction (XRD) pattern of MAPbI 3 and MAPbI 3 –DS films.…”

Section: The Key J–v Parameters Of the F‐pscsmentioning

confidence: 99%

Record Efficiency Stable Flexible Perovskite Solar Cell Using Effective Additive Assistant Strategy

et al. 2018

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Even though the power conversion efficiency (PCE) of rigid perovskite solar cells is increased to 22.7%, the PCE of flexible perovskite solar cells (F-PSCs) is still lower. Here, a novel dimethyl sulfide (DS) additive is developed to effectively improve the performance of the F-PSCs. Fourier transform infrared spectroscopy reveals that the DS additive reacts with Pb to form a chelated intermediate, which significantly slows down the crystallization rate, leading to large grain size and good crystallinity for the resultant perovskite film. In fact, the trap density of the perovskite film prepared using the DS additive is reduced by an order of magnitude compared to the one without it, demonstrating that the additive effectively retards transformation kinetics during the thin film formation process. As a result, the PCE of the flexible devices increases to 18.40%, with good mechanical tolerance, the highest reported so far for the F-PSCs. Meanwhile, the environmental stability of the F-PSCs significantly enhances by 1.72 times compared to the device without the additive, likely due to the large grain size that suppresses perovskite degradation at grain boundaries. The present strategy will help guide development of high efficiency F-PSCs for practical applications.

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“…For the standard spin-coating preparation of laboratory-scale small-area devices, various processing strategies have been reported during the past several years, such as anti-solvent casting, 20,21 solvent extraction, 22,23 hot casting, [24][25][26][27] forced gas flow, [28][29][30] and vacuum-assisted drying. [31][32][33] These methods have shown success at avoiding dendritic-shaped perovskite crystals and forming a uniform, dense perovskite layer. The underlying principle of these processes is to rapidly and uniformly remove the precursor solution solvent from the solid-state precursor thin films during substrate spinning to hinder uncontrolled crystal growth.…”

Section: Scalable Processing Of Perovskitementioning

confidence: 99%

Outlook and Challenges of Perovskite Solar Cells toward Terawatt-Scale Photovoltaic Module Technology

Kim

Whitaker

et al. 2018

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Rapid development of perovskite solar cells (PSCs) during the past several years has made this photovoltaic (PV) technology a serious contender for potential large-scale deployment on the terawatt scale in the PV market. To successfully transition PSC technology from the laboratory to industry scale, substantial efforts need to focus on scalable fabrication of high-performance perovskite modules with minimum negative environmental impact. Here, we provide an overview of the current research and our perspective regarding PSC technology toward future large-scale manufacturing and deployment. Several key challenges discussed are (1) a scalable process for large-area perovskite module fabrication; (2) less hazardous chemical routes for PSC fabrication; and (3) suitable perovskite module designs for different applications.

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Preparation of flexible perovskite solar cells by a gas pump drying method on a plastic substrate

Abstract: A uniform and full coverage perovskite film is of significant importance for flexible perovskite solar cells.

Cited by 88 publications

References 49 publications

Excellent Stability of Perovskite Solar Cells by Passivation Engineering

Excellent Stability of Perovskite Solar Cells by Passivation Engineering

Record Efficiency Stable Flexible Perovskite Solar Cell Using Effective Additive Assistant Strategy

Outlook and Challenges of Perovskite Solar Cells toward Terawatt-Scale Photovoltaic Module Technology

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