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Open Access Research Article Issue
Efficiency enhancement to 24.62% in inverted perovskite solar cells through poly (ionic liquid) bulk modification
Energy Materials and Devices 2024, 2(1): 9370029
Published: 29 March 2024
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Small-molecule ionic liquids (ILs) are frequently employed as efficient bulk phase modifiers for perovskite materials. However, their inherent characteristics, such as high volatility and ion migration properties, pose challenges in addressing the stability issues associated with perovskite solar cells (PSCs). In this study, we design a poly(IL) with multiple active sites, named poly[4-styrenesulfonyl(trifluoromethylsulfonyl)imide]pyridine (P[STFSI][PPyri]), as an efficient additive of perovskite materials. The S=O in the sulfonyl group chelates with uncoordinated Pb2+ and forms hydrogen bonds with the organic cations in the perovskite, suppressing the volatilization of the organic cations. The N+ in pyridine can fix halide ions through electrostatic interaction with I and Br ions to prevent halide ion migration. P[STFSI][PPyri] demonstrates the ability to passivate defects and suppress nonradiative recombination in PSCs. Additionally, it facilitates the fixation of organic and halide ions, thereby enhancing the device’s stability and photoelectric performance. Consequently, the introduction of P[STFSI][PPyri] as a dopant in the devices resulted in an excellent efficiency of 24.62%, demonstrating outstanding long-term operational stability, with the encapsulated device maintaining 87.6% of its initial efficiency even after 1500 h of continuous maximum power point tracking. This strategy highlights the promising potential of poly(IL) as an effective additive for PSCs, providing a combination of high performance and stability.

Open Access Research Article Issue
Surface modification with ionic liquid for efficient CsPbI2Br perovskite solar cells
Journal of Materiomics 2021, 7(5): 1039-1048
Published: 11 February 2021
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The presence of numerous trap states on the perovskite surface severely affects the performance of inorganic CsPbI2Br perovskite solar cells. Surface modification has been proven to be an effective strategy to passivate the surface trap states of CsPbI2Br perovskite. However, most modifiers behave high volatility and insulation, not enough to further develop the CsPbI2Br solar cells. Herein, an ionic liquid of 1-viny-3-propionate ethyl imidazolium chloride ([PEVIM]Cl) is applied to modify the CsPbI2Br film surface, yielding a compact film with enhanced crystallinity. The surface trap states of CsPbI2Br film are effectively passivated via the interaction between carbonyl group of [PEVIM]Cl and uncoordinated metal cations of CsPbI2Br perovskite, leading to charge recombination suppression and charge transport enhancement. Consequently, the power conversion efficiency (PCE) of [PEVIM]Cl modified CsPbI2Br device is obviously enhanced from 12.49% to 14.19% with an improved open-circuit voltage of 1.160 V. Moreover, the non-encapsulated device presents excellent thermal stability, still maintaining 91% PCE when heated at 85 °C in nitrogen atmosphere for 360 h. Meanwhile, the non-encapsulated device degrades only 11% PCE after stored at 50% relative humidity for 960 h. This simple and efficient approach provides a promising direction to fabricate high-efficiency and stable inorganic perovskite devices.

Open Access Research Article Issue
Effective additive for enhancing the performance of Sb2S3 planar thin film solar cells
Journal of Materiomics 2021, 7(5): 1074-1082
Published: 11 February 2021
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Sb2S3 is a promising photovoltaic absorber with appropriate bandgap, excellent light absorption coefficient and great stability. However, the power conversion efficiency (PCE) of Sb2S3 planar thin film solar cells is unsatisfactory for further commercial application due to low crystallinity and high resistivity of Sb2S3 film. Here, we introduce an additive of 4-Chloro-3-nitrobenzenesulfonyl Chloride (CSCl) to alleviate these problems. The CSCl molecular contains two terminal Cl with lone pair electrons, which have the interaction with Sb atoms. Thus, the Sb2S3 film with enhanced crystallization and low trap states has been obtained and the resistivity is also decreased. Furthermore, CSCl additive raises the Fermi level of the Sb2S3 film, thereby enhancing the transport of electron from Sb2S3 to TiO2. Consequently, the optimal PCE of Sb2S3 solar cells is raised from 4.20% (control device) to 5.84%. Our research demonstrates a novel additive to enhance the photoelectric performance of Sb2S3 solar cells.

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